[{"date_created":"2026-09-06T22:01:56Z","date_updated":"2026-09-09T12:19:54Z","doi":"10.3847/1538-4357/ae80b9","month":"08","arxiv":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","ddc":["520"],"oa_version":"Published Version","department":[{"_id":"JoMa"}],"supplementarymaterial":"no","type":"journal_article","oa":1,"scopus_import":"1","OA_place":"publisher","DOAJ_listed":"1","tmp":{"short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"fulldoi":"https://doi.org/10.3847/1538-4357/ae80b9","citation":{"ista":"Caputi KI, Cooper RA, Rinaldi P, Navarro-Carrera R, Iani E, Tumborang AA. 2026. Pseudo Little Red Dot: An active black hole embedded in a dense and dusty, metal-poor starburst galaxy at z = 5.96. The Astrophysical Journal. 1007(2), 203.","chicago":"Caputi, Karina I., Ryan A. Cooper, Pierluigi Rinaldi, Rafael Navarro-Carrera, Edoardo Iani, and Abigail A. Tumborang. “Pseudo Little Red Dot: An Active Black Hole Embedded in a Dense and Dusty, Metal-Poor Starburst Galaxy at z = 5.96.” <i>The Astrophysical Journal</i>. IOP Publishing, 2026. <a href=\"https://doi.org/10.3847/1538-4357/ae80b9\">https://doi.org/10.3847/1538-4357/ae80b9</a>.","short":"K.I. Caputi, R.A. Cooper, P. Rinaldi, R. Navarro-Carrera, E. Iani, A.A. Tumborang, The Astrophysical Journal 1007 (2026).","ama":"Caputi KI, Cooper RA, Rinaldi P, Navarro-Carrera R, Iani E, Tumborang AA. Pseudo Little Red Dot: An active black hole embedded in a dense and dusty, metal-poor starburst galaxy at z = 5.96. <i>The Astrophysical Journal</i>. 2026;1007(2). doi:<a href=\"https://doi.org/10.3847/1538-4357/ae80b9\">10.3847/1538-4357/ae80b9</a>","mla":"Caputi, Karina I., et al. “Pseudo Little Red Dot: An Active Black Hole Embedded in a Dense and Dusty, Metal-Poor Starburst Galaxy at z = 5.96.” <i>The Astrophysical Journal</i>, vol. 1007, no. 2, 203, IOP Publishing, 2026, doi:<a href=\"https://doi.org/10.3847/1538-4357/ae80b9\">10.3847/1538-4357/ae80b9</a>.","apa":"Caputi, K. I., Cooper, R. A., Rinaldi, P., Navarro-Carrera, R., Iani, E., &#38; Tumborang, A. A. (2026). Pseudo Little Red Dot: An active black hole embedded in a dense and dusty, metal-poor starburst galaxy at z = 5.96. <i>The Astrophysical Journal</i>. IOP Publishing. <a href=\"https://doi.org/10.3847/1538-4357/ae80b9\">https://doi.org/10.3847/1538-4357/ae80b9</a>","ieee":"K. I. Caputi, R. A. Cooper, P. Rinaldi, R. Navarro-Carrera, E. Iani, and A. A. Tumborang, “Pseudo Little Red Dot: An active black hole embedded in a dense and dusty, metal-poor starburst galaxy at z = 5.96,” <i>The Astrophysical Journal</i>, vol. 1007, no. 2. IOP Publishing, 2026."},"publication_identifier":{"issn":["0004-637X"],"eissn":["1538-4357"]},"file":[{"checksum":"cf878372382ac61b22f679b558bb4e4e","creator":"dernst","content_type":"application/pdf","date_created":"2026-09-09T12:19:36Z","date_updated":"2026-09-09T12:19:36Z","relation":"main_file","file_id":"22887","file_name":"2026_AstrophysicalJour_Caputi.pdf","file_size":2636477,"access_level":"open_access","success":1}],"file_date_updated":"2026-09-09T12:19:36Z","article_type":"original","OA_type":"gold","day":"20","publication_status":"published","year":"2026","has_accepted_license":"1","date_published":"2026-08-20T00:00:00Z","title":"Pseudo Little Red Dot: An active black hole embedded in a dense and dusty, metal-poor starburst galaxy at z = 5.96","author":[{"full_name":"Caputi, Karina I.","first_name":"Karina I.","last_name":"Caputi"},{"full_name":"Cooper, Ryan A.","first_name":"Ryan A.","last_name":"Cooper"},{"first_name":"Pierluigi","last_name":"Rinaldi","full_name":"Rinaldi, Pierluigi"},{"full_name":"Navarro-Carrera, Rafael","last_name":"Navarro-Carrera","first_name":"Rafael"},{"id":"4053390a-6b68-11ef-9828-a3b8adef8d0a","full_name":"Iani, Edoardo","last_name":"Iani","first_name":"Edoardo","orcid":"0000-0001-8386-3546"},{"first_name":"Abigail A.","last_name":"Tumborang","full_name":"Tumborang, Abigail A."}],"researchdata_availability":"no","_id":"22814","article_processing_charge":"Yes","publisher":"IOP Publishing","external_id":{"arxiv":["2601.11466"]},"issue":"2","article_number":"203","quality_controlled":"1","das_tickbox":"0","license":"https://creativecommons.org/licenses/by/4.0/","language":[{"iso":"eng"}],"acknowledgement":"We are grateful to Daniela Calzetti, Andrea Ferrara, Kohei Inayoshi, Roberto Maiolino, Gabriele Pezzulli, Fengwu Sun, and Z. Yan for useful discussions; José M. Diego for providing us the most updated magnification value for our source; Raphael Hviding for making his Python package unite public and instructing us regarding its use; and Elka Rusta and Stefania Salvadori for providing us their galaxy SED models with hybrid Pop III stellar populations. We also thank the anonymous referee for a useful and constructive report.\r\n\r\nThis work is based on observations made with the NASA/ESA/CSA JWST. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with the JWST GTO program PID 1208. The specific observations analyzed here can be accessed via doi:10.17909/pyr9-5r43. Some of the analyzed data products were retrieved from the Dawn JWST Archive (DJA). DJA is an initiative of the Cosmic Dawn Center (DAWN), which is funded by the Danish National Research Foundation under grant DNRF140. This work is also based on observations made with the NASA/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 526555.\r\n\r\nK.I.C. and R.N.C. acknowledge funding from the Dutch Research Council (NWO) through the award of the Vici grant VI.C.212.036.","intvolume":"      1007","status":"public","abstract":[{"text":"We present a study of a pseudo little red dot with no metal lines (Pseudo-LRD-NOM), a highly magnified lowmass galaxy behind the lensing cluster A370 at z = 5.96. We classify this object as a pseudo-LRD because its red\r\nrest-frame optical color is contaminated by a prominent Hα line (with EW0 ≳ 800 Å) present in its JWST\r\nNIRSpec spectrum. Hα is dominated by a narrow component and also has a minor broad component indicative of\r\nan active black hole with MBH ≈ 5.6 × 10^6 M⊙. A narrow Hβ emission line is also detected (where the signal-tonoise ratio, S/N, is 8), producing a Balmer decrement (narrow) Hα/Hβ = 11. The rest-frame UV spectral slope is ßspec/uv = - 1.20 ± 0.28. All these features can be ascribed to high dust attenuation. However, no [O III]λ5007 or\r\nany other metal lines are detected in the spectrum, so [O III]5007/Hβ < 0.25, at odds with a simple dust attenuation explanation. Accounting for all the spectral properties requires the model of a starburst with moderate\r\ncolor excess E(B − V )≈0.2–0.5, high gas density (nH ≳ 10^6 cm^−3\r\n), and low- to extremely-low gas/stellar\r\nmetallicities (Z = 0.01–0.1 Z⊙). The demagnified stellar mass is\r\n× 2.25+\r\n0\r\n1\r\n.\r\n.\r\n8\r\n3\r\n3\r\n0 10^7 M , and the stellar-mass surface\r\ndensity is = +\r\n* 418 M pc 310\r\n725 2, similar to that of massive/nuclear star clusters. Pseudo-LRD-NOM provides\r\nevidence of massive black-hole growth occurring in a high-density, dusty starburst that is at the early stages of its\r\nchemical enrichment, and is likely a precursor to a real LRD.","lang":"eng"}],"publication":"The Astrophysical Journal","volume":1007}]