--- OA_type: closed access _id: '18867' abstract: - lang: eng text: 'In an accreting X-ray pulsar, a neutron star accretes matter from a companion star through an accretion disk. The magnetic field of the rotating neutron star disrupts the inner edge of the disk, funnelling the gas to flow onto the poles on its surface. Hercules X-1 is a prototypical persistent X-ray pulsar about 7 kpc from Earth. Its emission varies on three distinct timescales: the neutron star rotates every 1.2 s, it is eclipsed by its companion each 1.7 d, and the system exhibits a superorbital period of 35 d, which has remained stable since its discovery. Several lines of evidence point to the source of this variation as the precession of the accretion disk or that of the neutron star. Despite the many hints over the past 50 yr, the precession of the neutron star itself has yet not been confirmed or refuted. X-ray polarization measurements (probing the spin geometry of Her X-1) with the Imaging X-ray Polarimetry Explorer suggest that free precession of the neutron star crust sets the 35 d period; this has the important implication that its crust is somewhat asymmetric by a few parts per ten million.' article_processing_charge: No article_type: original author: - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl - first_name: Victor full_name: Doroshenko, Victor last_name: Doroshenko - first_name: Denis full_name: González-Caniulef, Denis last_name: González-Caniulef - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Juri full_name: Poutanen, Juri last_name: Poutanen - first_name: Alexander full_name: Mushtukov, Alexander last_name: Mushtukov - first_name: Sergey S. full_name: Tsygankov, Sergey S. last_name: Tsygankov - first_name: Demet full_name: Kirmizibayrak, Demet last_name: Kirmizibayrak - first_name: Matteo full_name: Bachetti, Matteo last_name: Bachetti - first_name: George G. full_name: Pavlov, George G. last_name: Pavlov - first_name: Sofia V. full_name: Forsblom, Sofia V. last_name: Forsblom - first_name: Christian full_name: Malacaria, Christian last_name: Malacaria - first_name: Valery F. full_name: Suleimanov, Valery F. last_name: Suleimanov - first_name: Iván full_name: Agudo, Iván last_name: Agudo - first_name: Lucio Angelo full_name: Antonelli, Lucio Angelo last_name: Antonelli - first_name: Luca full_name: Baldini, Luca last_name: Baldini - first_name: Wayne H. full_name: Baumgartner, Wayne H. last_name: Baumgartner - first_name: Ronaldo full_name: Bellazzini, Ronaldo last_name: Bellazzini - first_name: Stefano full_name: Bianchi, Stefano last_name: Bianchi - first_name: Stephen D. full_name: Bongiorno, Stephen D. last_name: Bongiorno - first_name: Raffaella full_name: Bonino, Raffaella last_name: Bonino - first_name: Alessandro full_name: Brez, Alessandro last_name: Brez - first_name: Niccolò full_name: Bucciantini, Niccolò last_name: Bucciantini - first_name: Fiamma full_name: Capitanio, Fiamma last_name: Capitanio - first_name: Simone full_name: Castellano, Simone last_name: Castellano - first_name: Elisabetta full_name: Cavazzuti, Elisabetta last_name: Cavazzuti - first_name: Chien-Ting full_name: Chen, Chien-Ting last_name: Chen - first_name: Stefano full_name: Ciprini, Stefano last_name: Ciprini - first_name: Enrico full_name: Costa, Enrico last_name: Costa - first_name: Alessandra full_name: De Rosa, Alessandra last_name: De Rosa - first_name: Ettore full_name: Del Monte, Ettore last_name: Del Monte - first_name: Laura full_name: Di Gesu, Laura last_name: Di Gesu - first_name: Niccolò full_name: Di Lalla, Niccolò last_name: Di Lalla - first_name: Alessandro full_name: Di Marco, Alessandro last_name: Di Marco - first_name: Immacolata full_name: Donnarumma, Immacolata last_name: Donnarumma - first_name: Michal full_name: Dovčiak, Michal last_name: Dovčiak - first_name: Steven R. full_name: Ehlert, Steven R. last_name: Ehlert - first_name: Teruaki full_name: Enoto, Teruaki last_name: Enoto - first_name: Yuri full_name: Evangelista, Yuri last_name: Evangelista - first_name: Sergio full_name: Fabiani, Sergio last_name: Fabiani - first_name: Riccardo full_name: Ferrazzoli, Riccardo last_name: Ferrazzoli - first_name: Javier A. full_name: Garcia, Javier A. last_name: Garcia - first_name: Shuichi full_name: Gunji, Shuichi last_name: Gunji - first_name: Kiyoshi full_name: Hayashida, Kiyoshi last_name: Hayashida - first_name: Wataru full_name: Iwakiri, Wataru last_name: Iwakiri - first_name: Svetlana G. full_name: Jorstad, Svetlana G. last_name: Jorstad - first_name: Philip full_name: Kaaret, Philip last_name: Kaaret - first_name: Vladimir full_name: Karas, Vladimir last_name: Karas - first_name: Fabian full_name: Kislat, Fabian last_name: Kislat - first_name: Takao full_name: Kitaguchi, Takao last_name: Kitaguchi - first_name: Jeffery J. full_name: Kolodziejczak, Jeffery J. last_name: Kolodziejczak - first_name: Henric full_name: Krawczynski, Henric last_name: Krawczynski - first_name: Fabio full_name: La Monaca, Fabio last_name: La Monaca - first_name: Luca full_name: Latronico, Luca last_name: Latronico - first_name: Ioannis full_name: Liodakis, Ioannis last_name: Liodakis - first_name: Simone full_name: Maldera, Simone last_name: Maldera - first_name: Alberto full_name: Manfreda, Alberto last_name: Manfreda - first_name: Frédéric full_name: Marin, Frédéric last_name: Marin - first_name: Andrea full_name: Marinucci, Andrea last_name: Marinucci - first_name: Alan P. full_name: Marscher, Alan P. last_name: Marscher - first_name: Herman L. full_name: Marshall, Herman L. last_name: Marshall - first_name: Francesco full_name: Massaro, Francesco last_name: Massaro - first_name: Giorgio full_name: Matt, Giorgio last_name: Matt - first_name: Ikuyuki full_name: Mitsuishi, Ikuyuki last_name: Mitsuishi - first_name: Tsunefumi full_name: Mizuno, Tsunefumi last_name: Mizuno - first_name: Fabio full_name: Muleri, Fabio last_name: Muleri - first_name: Michela full_name: Negro, Michela last_name: Negro - first_name: C.-Y. full_name: Ng, C.-Y. last_name: Ng - first_name: Stephen L. full_name: O’Dell, Stephen L. last_name: O’Dell - first_name: Nicola full_name: Omodei, Nicola last_name: Omodei - first_name: Chiara full_name: Oppedisano, Chiara last_name: Oppedisano - first_name: Alessandro full_name: Papitto, Alessandro last_name: Papitto - first_name: Abel Lawrence full_name: Peirson, Abel Lawrence last_name: Peirson - first_name: Matteo full_name: Perri, Matteo last_name: Perri - first_name: Melissa full_name: Pesce-Rollins, Melissa last_name: Pesce-Rollins - first_name: Pierre-Olivier full_name: Petrucci, Pierre-Olivier last_name: Petrucci - first_name: Maura full_name: Pilia, Maura last_name: Pilia - first_name: Andrea full_name: Possenti, Andrea last_name: Possenti - first_name: Simonetta full_name: Puccetti, Simonetta last_name: Puccetti - first_name: Brian D. full_name: Ramsey, Brian D. last_name: Ramsey - first_name: John full_name: Rankin, John last_name: Rankin - first_name: Ajay full_name: Ratheesh, Ajay last_name: Ratheesh - first_name: Oliver J. full_name: Roberts, Oliver J. last_name: Roberts - first_name: Roger W. full_name: Romani, Roger W. last_name: Romani - first_name: Carmelo full_name: Sgrò, Carmelo last_name: Sgrò - first_name: Patrick full_name: Slane, Patrick last_name: Slane - first_name: Paolo full_name: Soffitta, Paolo last_name: Soffitta - first_name: Gloria full_name: Spandre, Gloria last_name: Spandre - first_name: Douglas A. full_name: Swartz, Douglas A. last_name: Swartz - first_name: Toru full_name: Tamagawa, Toru last_name: Tamagawa - first_name: Fabrizio full_name: Tavecchio, Fabrizio last_name: Tavecchio - first_name: Roberto full_name: Taverna, Roberto last_name: Taverna - first_name: Yuzuru full_name: Tawara, Yuzuru last_name: Tawara - first_name: Allyn F. full_name: Tennant, Allyn F. last_name: Tennant - first_name: Nicholas E. full_name: Thomas, Nicholas E. last_name: Thomas - first_name: Francesco full_name: Tombesi, Francesco last_name: Tombesi - first_name: Alessio full_name: Trois, Alessio last_name: Trois - first_name: Roberto full_name: Turolla, Roberto last_name: Turolla - first_name: Jacco full_name: Vink, Jacco last_name: Vink - first_name: Martin C. full_name: Weisskopf, Martin C. last_name: Weisskopf - first_name: Kinwah full_name: Wu, Kinwah last_name: Wu - first_name: Fei full_name: Xie, Fei last_name: Xie - first_name: Silvia full_name: Zane, Silvia last_name: Zane citation: ama: Heyl J, Doroshenko V, González-Caniulef D, et al. Complex rotational dynamics of the neutron star in Hercules X-1 revealed by X-ray polarization. Nature Astronomy. 2024;8:1047-1053. doi:10.1038/s41550-024-02295-8 apa: Heyl, J., Doroshenko, V., González-Caniulef, D., Caiazzo, I., Poutanen, J., Mushtukov, A., … Zane, S. (2024). Complex rotational dynamics of the neutron star in Hercules X-1 revealed by X-ray polarization. Nature Astronomy. Springer Nature. https://doi.org/10.1038/s41550-024-02295-8 chicago: Heyl, Jeremy, Victor Doroshenko, Denis González-Caniulef, Ilaria Caiazzo, Juri Poutanen, Alexander Mushtukov, Sergey S. Tsygankov, et al. “Complex Rotational Dynamics of the Neutron Star in Hercules X-1 Revealed by X-Ray Polarization.” Nature Astronomy. Springer Nature, 2024. https://doi.org/10.1038/s41550-024-02295-8. ieee: J. Heyl et al., “Complex rotational dynamics of the neutron star in Hercules X-1 revealed by X-ray polarization,” Nature Astronomy, vol. 8. Springer Nature, pp. 1047–1053, 2024. ista: Heyl J et al. 2024. Complex rotational dynamics of the neutron star in Hercules X-1 revealed by X-ray polarization. Nature Astronomy. 8, 1047–1053. mla: Heyl, Jeremy, et al. “Complex Rotational Dynamics of the Neutron Star in Hercules X-1 Revealed by X-Ray Polarization.” Nature Astronomy, vol. 8, Springer Nature, 2024, pp. 1047–53, doi:10.1038/s41550-024-02295-8. short: J. Heyl, V. Doroshenko, D. González-Caniulef, I. Caiazzo, J. Poutanen, A. Mushtukov, S.S. Tsygankov, D. Kirmizibayrak, M. Bachetti, G.G. Pavlov, S.V. Forsblom, C. Malacaria, V.F. Suleimanov, I. Agudo, L.A. Antonelli, L. Baldini, W.H. Baumgartner, R. Bellazzini, S. Bianchi, S.D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, C.-T. Chen, S. Ciprini, E. Costa, A. De Rosa, E. Del Monte, L. Di Gesu, N. Di Lalla, A. Di Marco, I. Donnarumma, M. Dovčiak, S.R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J.A. Garcia, S. Gunji, K. Hayashida, W. Iwakiri, S.G. Jorstad, P. Kaaret, V. Karas, F. Kislat, T. Kitaguchi, J.J. Kolodziejczak, H. Krawczynski, F. La Monaca, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A.P. Marscher, H.L. Marshall, F. Massaro, G. Matt, I. Mitsuishi, T. Mizuno, F. Muleri, M. Negro, C.-Y. Ng, S.L. O’Dell, N. Omodei, C. Oppedisano, A. Papitto, A.L. Peirson, M. Perri, M. Pesce-Rollins, P.-O. Petrucci, M. Pilia, A. Possenti, S. Puccetti, B.D. Ramsey, J. Rankin, A. Ratheesh, O.J. Roberts, R.W. Romani, C. Sgrò, P. Slane, P. Soffitta, G. Spandre, D.A. Swartz, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A.F. Tennant, N.E. Thomas, F. Tombesi, A. Trois, R. Turolla, J. Vink, M.C. Weisskopf, K. Wu, F. Xie, S. Zane, Nature Astronomy 8 (2024) 1047–1053. date_created: 2025-01-21T15:35:17Z date_published: 2024-08-01T00:00:00Z date_updated: 2025-01-27T10:52:16Z day: '01' doi: 10.1038/s41550-024-02295-8 extern: '1' intvolume: ' 8' language: - iso: eng month: '08' oa_version: None page: 1047-1053 publication: Nature Astronomy publication_identifier: issn: - 2397-3366 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Complex rotational dynamics of the neutron star in Hercules X-1 revealed by X-ray polarization type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 8 year: '2024' ... --- _id: '15204' abstract: - lang: eng text: Using observations of X-ray pulsar Hercules X-1 by the Imaging X-ray Polarimetry Explorer we report a highly significant (>17σ) detection of the polarization signal from an accreting neutron star. The observed degree of linear polarization of ~10% is far below theoretical expectations for this object, and stays low throughout the spin cycle of the pulsar. Both the degree and angle of polarization exhibit variability with the pulse phase, allowing us to measure the pulsar spin position angle 57(2) deg and the magnetic obliquity 12(4) deg, which is an essential step towards detailed modelling of the intrinsic emission of X-ray pulsars. Combining our results with the optical polarimetric data, we find that the spin axis of the neutron star and the angular momentum of the binary orbit are misaligned by at least ~20 deg, which is a strong argument in support of the models explaining the stability of the observed superorbital variability with the precession of the neutron star. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Victor full_name: Doroshenko, Victor last_name: Doroshenko - first_name: Juri full_name: Poutanen, Juri last_name: Poutanen - first_name: Sergey S. full_name: Tsygankov, Sergey S. last_name: Tsygankov - first_name: Valery F. full_name: Suleimanov, Valery F. last_name: Suleimanov - first_name: Matteo full_name: Bachetti, Matteo last_name: Bachetti - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Enrico full_name: Costa, Enrico last_name: Costa - first_name: Alessandro full_name: Di Marco, Alessandro last_name: Di Marco - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl - first_name: Fabio full_name: La Monaca, Fabio last_name: La Monaca - first_name: Fabio full_name: Muleri, Fabio last_name: Muleri - first_name: Alexander A. full_name: Mushtukov, Alexander A. last_name: Mushtukov - first_name: George G. full_name: Pavlov, George G. last_name: Pavlov - first_name: Brian D. full_name: Ramsey, Brian D. last_name: Ramsey - first_name: John full_name: Rankin, John last_name: Rankin - first_name: Andrea full_name: Santangelo, Andrea last_name: Santangelo - first_name: Paolo full_name: Soffitta, Paolo last_name: Soffitta - first_name: Rüdiger full_name: Staubert, Rüdiger last_name: Staubert - first_name: Martin C. full_name: Weisskopf, Martin C. last_name: Weisskopf - first_name: Silvia full_name: Zane, Silvia last_name: Zane - first_name: Iván full_name: Agudo, Iván last_name: Agudo - first_name: Lucio A. full_name: Antonelli, Lucio A. last_name: Antonelli - first_name: Luca full_name: Baldini, Luca last_name: Baldini - first_name: Wayne H. full_name: Baumgartner, Wayne H. last_name: Baumgartner - first_name: Ronaldo full_name: Bellazzini, Ronaldo last_name: Bellazzini - first_name: Stefano full_name: Bianchi, Stefano last_name: Bianchi - first_name: Stephen D. full_name: Bongiorno, Stephen D. last_name: Bongiorno - first_name: Raffaella full_name: Bonino, Raffaella last_name: Bonino - first_name: Alessandro full_name: Brez, Alessandro last_name: Brez - first_name: Niccolò full_name: Bucciantini, Niccolò last_name: Bucciantini - first_name: Fiamma full_name: Capitanio, Fiamma last_name: Capitanio - first_name: Simone full_name: Castellano, Simone last_name: Castellano - first_name: Elisabetta full_name: Cavazzuti, Elisabetta last_name: Cavazzuti - first_name: Stefano full_name: Ciprini, Stefano last_name: Ciprini - first_name: Alessandra full_name: De Rosa, Alessandra last_name: De Rosa - first_name: Ettore full_name: Del Monte, Ettore last_name: Del Monte - first_name: Laura full_name: Di Gesu, Laura last_name: Di Gesu - first_name: Niccolò full_name: Di Lalla, Niccolò last_name: Di Lalla - first_name: Immacolata full_name: Donnarumma, Immacolata last_name: Donnarumma - first_name: Michal full_name: Dovčiak, Michal last_name: Dovčiak - first_name: Steven R. full_name: Ehlert, Steven R. last_name: Ehlert - first_name: Teruaki full_name: Enoto, Teruaki last_name: Enoto - first_name: Yuri full_name: Evangelista, Yuri last_name: Evangelista - first_name: Sergio full_name: Fabiani, Sergio last_name: Fabiani - first_name: Riccardo full_name: Ferrazzoli, Riccardo last_name: Ferrazzoli - first_name: Javier A. full_name: Garcia, Javier A. last_name: Garcia - first_name: Shuichi full_name: Gunji, Shuichi last_name: Gunji - first_name: Kiyoshi full_name: Hayashida, Kiyoshi last_name: Hayashida - first_name: Wataru full_name: Iwakiri, Wataru last_name: Iwakiri - first_name: Svetlana G. full_name: Jorstad, Svetlana G. last_name: Jorstad - first_name: Vladimir full_name: Karas, Vladimir last_name: Karas - first_name: Takao full_name: Kitaguchi, Takao last_name: Kitaguchi - first_name: Jeffery J. full_name: Kolodziejczak, Jeffery J. last_name: Kolodziejczak - first_name: Henric full_name: Krawczynski, Henric last_name: Krawczynski - first_name: Luca full_name: Latronico, Luca last_name: Latronico - first_name: Ioannis full_name: Liodakis, Ioannis last_name: Liodakis - first_name: Simone full_name: Maldera, Simone last_name: Maldera - first_name: Alberto full_name: Manfreda, Alberto last_name: Manfreda - first_name: Frédéric full_name: Marin, Frédéric last_name: Marin - first_name: Andrea full_name: Marinucci, Andrea last_name: Marinucci - first_name: Alan P. full_name: Marscher, Alan P. last_name: Marscher - first_name: Herman L. full_name: Marshall, Herman L. last_name: Marshall - first_name: Giorgio full_name: Matt, Giorgio last_name: Matt - first_name: Ikuyuki full_name: Mitsuishi, Ikuyuki last_name: Mitsuishi - first_name: Tsunefumi full_name: Mizuno, Tsunefumi last_name: Mizuno - first_name: Chi-Yung full_name: Ng, Chi-Yung last_name: Ng - first_name: Stephen L. full_name: O’Dell, Stephen L. last_name: O’Dell - first_name: Nicola full_name: Omodei, Nicola last_name: Omodei - first_name: Chiara full_name: Oppedisano, Chiara last_name: Oppedisano - first_name: Alessandro full_name: Papitto, Alessandro last_name: Papitto - first_name: Abel L. full_name: Peirson, Abel L. last_name: Peirson - first_name: Matteo full_name: Perri, Matteo last_name: Perri - first_name: Melissa full_name: Pesce-Rollins, Melissa last_name: Pesce-Rollins - first_name: Maura full_name: Pilia, Maura last_name: Pilia - first_name: Andrea full_name: Possenti, Andrea last_name: Possenti - first_name: Simonetta full_name: Puccetti, Simonetta last_name: Puccetti - first_name: Ajay full_name: Ratheesh, Ajay last_name: Ratheesh - first_name: Roger W. full_name: Romani, Roger W. last_name: Romani - first_name: Carmelo full_name: Sgrò, Carmelo last_name: Sgrò - first_name: Patrick full_name: Slane, Patrick last_name: Slane - first_name: Gloria full_name: Spandre, Gloria last_name: Spandre - first_name: Rashid A. full_name: Sunyaev, Rashid A. last_name: Sunyaev - first_name: Toru full_name: Tamagawa, Toru last_name: Tamagawa - first_name: Fabrizio full_name: Tavecchio, Fabrizio last_name: Tavecchio - first_name: Roberto full_name: Taverna, Roberto last_name: Taverna - first_name: Yuzuru full_name: Tawara, Yuzuru last_name: Tawara - first_name: Allyn F. full_name: Tennant, Allyn F. last_name: Tennant - first_name: Nicolas E. full_name: Thomas, Nicolas E. last_name: Thomas - first_name: Francesco full_name: Tombesi, Francesco last_name: Tombesi - first_name: Alessio full_name: Trois, Alessio last_name: Trois - first_name: Roberto full_name: Turolla, Roberto last_name: Turolla - first_name: Jacco full_name: Vink, Jacco last_name: Vink - first_name: Kinwah full_name: Wu, Kinwah last_name: Wu - first_name: Fei full_name: Xie, Fei last_name: Xie citation: ama: Doroshenko V, Poutanen J, Tsygankov SS, et al. Determination of X-ray pulsar geometry with IXPE polarimetry. Nature Astronomy. 2022;6(12):1433-1443. doi:10.1038/s41550-022-01799-5 apa: Doroshenko, V., Poutanen, J., Tsygankov, S. S., Suleimanov, V. F., Bachetti, M., Caiazzo, I., … Xie, F. (2022). Determination of X-ray pulsar geometry with IXPE polarimetry. Nature Astronomy. Springer Nature. https://doi.org/10.1038/s41550-022-01799-5 chicago: Doroshenko, Victor, Juri Poutanen, Sergey S. Tsygankov, Valery F. Suleimanov, Matteo Bachetti, Ilaria Caiazzo, Enrico Costa, et al. “Determination of X-Ray Pulsar Geometry with IXPE Polarimetry.” Nature Astronomy. Springer Nature, 2022. https://doi.org/10.1038/s41550-022-01799-5. ieee: V. Doroshenko et al., “Determination of X-ray pulsar geometry with IXPE polarimetry,” Nature Astronomy, vol. 6, no. 12. Springer Nature, pp. 1433–1443, 2022. ista: Doroshenko V, Poutanen J, Tsygankov SS, Suleimanov VF, Bachetti M, Caiazzo I, Costa E, Di Marco A, Heyl J, La Monaca F, Muleri F, Mushtukov AA, Pavlov GG, Ramsey BD, Rankin J, Santangelo A, Soffitta P, Staubert R, Weisskopf MC, Zane S, Agudo I, Antonelli LA, Baldini L, Baumgartner WH, Bellazzini R, Bianchi S, Bongiorno SD, Bonino R, Brez A, Bucciantini N, Capitanio F, Castellano S, Cavazzuti E, Ciprini S, De Rosa A, Del Monte E, Di Gesu L, Di Lalla N, Donnarumma I, Dovčiak M, Ehlert SR, Enoto T, Evangelista Y, Fabiani S, Ferrazzoli R, Garcia JA, Gunji S, Hayashida K, Iwakiri W, Jorstad SG, Karas V, Kitaguchi T, Kolodziejczak JJ, Krawczynski H, Latronico L, Liodakis I, Maldera S, Manfreda A, Marin F, Marinucci A, Marscher AP, Marshall HL, Matt G, Mitsuishi I, Mizuno T, Ng C-Y, O’Dell SL, Omodei N, Oppedisano C, Papitto A, Peirson AL, Perri M, Pesce-Rollins M, Pilia M, Possenti A, Puccetti S, Ratheesh A, Romani RW, Sgrò C, Slane P, Spandre G, Sunyaev RA, Tamagawa T, Tavecchio F, Taverna R, Tawara Y, Tennant AF, Thomas NE, Tombesi F, Trois A, Turolla R, Vink J, Wu K, Xie F. 2022. Determination of X-ray pulsar geometry with IXPE polarimetry. Nature Astronomy. 6(12), 1433–1443. mla: Doroshenko, Victor, et al. “Determination of X-Ray Pulsar Geometry with IXPE Polarimetry.” Nature Astronomy, vol. 6, no. 12, Springer Nature, 2022, pp. 1433–43, doi:10.1038/s41550-022-01799-5. short: V. Doroshenko, J. Poutanen, S.S. Tsygankov, V.F. Suleimanov, M. Bachetti, I. Caiazzo, E. Costa, A. Di Marco, J. Heyl, F. La Monaca, F. Muleri, A.A. Mushtukov, G.G. Pavlov, B.D. Ramsey, J. Rankin, A. Santangelo, P. Soffitta, R. Staubert, M.C. Weisskopf, S. Zane, I. Agudo, L.A. Antonelli, L. Baldini, W.H. Baumgartner, R. Bellazzini, S. Bianchi, S.D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, S. Ciprini, A. De Rosa, E. Del Monte, L. Di Gesu, N. Di Lalla, I. Donnarumma, M. Dovčiak, S.R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J.A. Garcia, S. Gunji, K. Hayashida, W. Iwakiri, S.G. Jorstad, V. Karas, T. Kitaguchi, J.J. Kolodziejczak, H. Krawczynski, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A.P. Marscher, H.L. Marshall, G. Matt, I. Mitsuishi, T. Mizuno, C.-Y. Ng, S.L. O’Dell, N. Omodei, C. Oppedisano, A. Papitto, A.L. Peirson, M. Perri, M. Pesce-Rollins, M. Pilia, A. Possenti, S. Puccetti, A. Ratheesh, R.W. Romani, C. Sgrò, P. Slane, G. Spandre, R.A. Sunyaev, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A.F. Tennant, N.E. Thomas, F. Tombesi, A. Trois, R. Turolla, J. Vink, K. Wu, F. Xie, Nature Astronomy 6 (2022) 1433–1443. date_created: 2024-03-26T09:51:04Z date_published: 2022-10-22T00:00:00Z date_updated: 2024-04-02T07:16:54Z day: '22' doi: 10.1038/s41550-022-01799-5 extern: '1' external_id: arxiv: - '2206.07138' intvolume: ' 6' issue: '12' keyword: - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2206.07138 month: '10' oa: 1 oa_version: Preprint page: 1433-1443 publication: Nature Astronomy publication_identifier: issn: - 2397-3366 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Determination of X-ray pulsar geometry with IXPE polarimetry type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 6 year: '2022' ... --- _id: '17544' abstract: - lang: eng text: Large cosmological datasets have been probing the properties of our Universe and constraining the parameters of dark matter and dark energy with increasing precision. Deep learning techniques have shown potential to be smarter than — and greatly outperform — human-designed statistics. article_processing_charge: No article_type: original author: - first_name: Zoltán full_name: Haiman, Zoltán id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36 last_name: Haiman citation: ama: Haiman Z. Learning from the machine. Nature Astronomy. 2018;3(1):18-19. doi:10.1038/s41550-018-0623-9 apa: Haiman, Z. (2018). Learning from the machine. Nature Astronomy. Springer Science and Business Media LLC. https://doi.org/10.1038/s41550-018-0623-9 chicago: Haiman, Zoltán. “Learning from the Machine.” Nature Astronomy. Springer Science and Business Media LLC, 2018. https://doi.org/10.1038/s41550-018-0623-9. ieee: Z. Haiman, “Learning from the machine,” Nature Astronomy, vol. 3, no. 1. Springer Science and Business Media LLC, pp. 18–19, 2018. ista: Haiman Z. 2018. Learning from the machine. Nature Astronomy. 3(1), 18–19. mla: Haiman, Zoltán. “Learning from the Machine.” Nature Astronomy, vol. 3, no. 1, Springer Science and Business Media LLC, 2018, pp. 18–19, doi:10.1038/s41550-018-0623-9. short: Z. Haiman, Nature Astronomy 3 (2018) 18–19. date_created: 2024-09-05T10:01:23Z date_published: 2018-10-29T00:00:00Z date_updated: 2024-09-18T08:51:45Z day: '29' doi: 10.1038/s41550-018-0623-9 extern: '1' intvolume: ' 3' issue: '1' language: - iso: eng main_file_link: - url: https://doi.org/10.1038/s41550-018-0623-9 month: '10' oa_version: None page: 18-19 publication: Nature Astronomy publication_identifier: issn: - 2397-3366 publication_status: published publisher: Springer Science and Business Media LLC quality_controlled: '1' scopus_import: '1' status: public title: Learning from the machine type: journal_article user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345 volume: 3 year: '2018' ... --- _id: '17667' abstract: - lang: eng text: The Direct Collapse Black Hole (DCBH) scenario provides a solution for forming the massive black holes powering bright quasars observed in the early Universe. A prerequisite for forming a DCBH is that the formation of (much less massive) Population III stars be avoided - this can be achieved by destroying H2 via Lyman-Werner (LW) radiation (ELW = 12.6 eV). We find that two conditions must be met in the proto-galaxy that will host the DCBH. First, prior star formation must be delayed; this can be achieved with a background LW flux of JBG≳100 J21. Second, an intense burst of LW radiation from a neighbouring star-bursting proto-galaxy is required, just before the gas cloud undergoes gravitational collapse, to finally suppress star formation completely. We show here for the first time using high-resolution hydrodynamical simulations, including full radiative transfer, that this low-level background, combined with tight synchronisation and irradiation of a secondary proto-galaxy by a primary proto-galaxy, inevitably moves the secondary proto-galaxy onto the isothermal atomic cooling track, without the deleterious effects of either photo-evaporating the gas or polluting it by heavy elements. These, atomically cooled, massive proto-galaxies are expected to ultimately form a DCBH of mass 104−105M⊙. article_number: '0075' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: John A. full_name: Regan, John A. last_name: Regan - first_name: Eli full_name: Visbal, Eli last_name: Visbal - first_name: John H. full_name: Wise, John H. last_name: Wise - first_name: Zoltán full_name: Haiman, Zoltán id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36 last_name: Haiman - first_name: Peter H. full_name: Johansson, Peter H. last_name: Johansson - first_name: Greg L. full_name: Bryan, Greg L. last_name: Bryan citation: ama: Regan JA, Visbal E, Wise JH, Haiman Z, Johansson PH, Bryan GL. Rapid formation of massive black holes in close proximity to embryonic protogalaxies. Nature Astronomy. 2017;1(4). doi:10.1038/s41550-017-0075 apa: Regan, J. A., Visbal, E., Wise, J. H., Haiman, Z., Johansson, P. H., & Bryan, G. L. (2017). Rapid formation of massive black holes in close proximity to embryonic protogalaxies. Nature Astronomy. Springer Science and Business Media LLC. https://doi.org/10.1038/s41550-017-0075 chicago: Regan, John A., Eli Visbal, John H. Wise, Zoltán Haiman, Peter H. Johansson, and Greg L. Bryan. “Rapid Formation of Massive Black Holes in Close Proximity to Embryonic Protogalaxies.” Nature Astronomy. Springer Science and Business Media LLC, 2017. https://doi.org/10.1038/s41550-017-0075. ieee: J. A. Regan, E. Visbal, J. H. Wise, Z. Haiman, P. H. Johansson, and G. L. Bryan, “Rapid formation of massive black holes in close proximity to embryonic protogalaxies,” Nature Astronomy, vol. 1, no. 4. Springer Science and Business Media LLC, 2017. ista: Regan JA, Visbal E, Wise JH, Haiman Z, Johansson PH, Bryan GL. 2017. Rapid formation of massive black holes in close proximity to embryonic protogalaxies. Nature Astronomy. 1(4), 0075. mla: Regan, John A., et al. “Rapid Formation of Massive Black Holes in Close Proximity to Embryonic Protogalaxies.” Nature Astronomy, vol. 1, no. 4, 0075, Springer Science and Business Media LLC, 2017, doi:10.1038/s41550-017-0075. short: J.A. Regan, E. Visbal, J.H. Wise, Z. Haiman, P.H. Johansson, G.L. Bryan, Nature Astronomy 1 (2017). date_created: 2024-09-06T07:45:20Z date_published: 2017-03-13T00:00:00Z date_updated: 2024-09-25T07:54:31Z day: '13' doi: 10.1038/s41550-017-0075 extern: '1' external_id: arxiv: - '1703.03805' intvolume: ' 1' issue: '4' language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.1703.03805' month: '03' oa: 1 oa_version: Preprint publication: Nature Astronomy publication_identifier: issn: - 2397-3366 publication_status: published publisher: Springer Science and Business Media LLC quality_controlled: '1' scopus_import: '1' status: public title: Rapid formation of massive black holes in close proximity to embryonic protogalaxies type: journal_article user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345 volume: 1 year: '2017' ...