--- res: bibo_abstract: - "Context. The recently launched James Webb Space Telescope (JWST) is opening new observing windows on the distant Universe. Among JWST’s instruments, the Mid Infrared Instrument (MIRI) offers the unique capability of imaging observations at wavelengths of λ > 5 μm. This enables unique access to the rest frame near-infrared (NIR, λ ≥ 1 μm) emission from galaxies at redshifts of z > 4 and the visual (λ ≳ 5000 Å) rest frame for z > 9. We report here on the guaranteed time observations (GTO), from the MIRI European Consortium, of the Hubble Ultra Deep Field (HUDF), forming the MIRI Deep Imaging Survey (MIDIS), consisting of an on source integration time of ∼41 hours in the MIRI/F560W (5.6 μm) filter. The F560W filter was selected since it would produce the deepest data in terms of AB magnitudes in a given time. To our knowledge, this constitutes the longest single filter exposure obtained with JWST of an extragalactic field as of yet.\r\nAims. The HUDF is one of the most observed extragalactic fields, with extensive multi-wavelength coverage, where (before JWST) galaxies up to z ∼ 7 have been confirmed, and at z > 10 suggested, from HST photometry. We aim to characterise the galaxy population in HUDF at 5.6 μm, enabling studies such as: the rest frame NIR morphologies for galaxies at z ≲ 4.6, probing mature stellar populations and emission lines in z > 6 sources, intrinsically red and dusty galaxies, and active galactic nuclei (AGNs) and their host galaxies at intermediate redshifts.\r\n\r\nMethods. We reduced the MIRI data using the official JWST pipeline, augmented by in-house custom scripts. We measured the noise characteristics of the resulting image. Galaxy photometry was obtained, and photometric redshifts were estimated for sources with available multi-wavelength photometry (and compared to spectroscopic redshifts when available).\r\n\r\nResults. Over the deepest part of our image, the 5σ point source limit is 28.65 mag AB (12.6 nJy), ∼0.35 mag better than predicted by the JWST exposure time calculator. We find ∼2500 sources, the overwhelming majority of which are distant galaxies, but we note that spurious sources likely remain at faint magnitudes due to imperfect cosmic ray rejection in the JWST pipeline. More than 500 galaxies with available spectroscopic redshifts, up to z ≈ 11, have been identified, the majority of which are at z < 6. More than 1000 galaxies have reliable photometric redshift estimates, of which ∼25 are at 6 < z < 12. The point spread function in the F560W filter has a full width at half maximum (FWHM) of ≈0.2″ (corresponding to 1.4 kpc at z = 4), allowing the NIR rest frame morphologies and stellar mass distributions to be resolved for z < 4.5. Moreover, > 100 objects with very red NIRCam vs MIRI (3.6–5.6 μm > 1 mag) colours have been found, suggestive of dusty or old stellar populations at high redshifts.\r\n\r\nConclusions. We conclude that MIDIS surpasses preflight expectations and that deep MIRI imaging has great potential to characterise the galaxy population from cosmic noon to dawn.@eng" bibo_authorlist: - foaf_Person: foaf_givenName: Göran foaf_name: Östlin, Göran foaf_surname: Östlin - foaf_Person: foaf_givenName: Pablo G. foaf_name: Pérez-González, Pablo G. foaf_surname: Pérez-González - foaf_Person: foaf_givenName: Jens foaf_name: Melinder, Jens foaf_surname: Melinder - foaf_Person: foaf_givenName: Steven foaf_name: Gillman, Steven foaf_surname: Gillman - foaf_Person: foaf_givenName: Edoardo foaf_name: Iani, Edoardo foaf_surname: Iani foaf_workInfoHomepage: http://www.librecat.org/personId=4053390a-6b68-11ef-9828-a3b8adef8d0a orcid: 0000-0001-8386-3546 - foaf_Person: foaf_givenName: Luca foaf_name: Costantin, Luca foaf_surname: Costantin - foaf_Person: foaf_givenName: Leindert A. foaf_name: Boogaard, Leindert A. foaf_surname: Boogaard - foaf_Person: foaf_givenName: Pierluigi foaf_name: Rinaldi, Pierluigi foaf_surname: Rinaldi - foaf_Person: foaf_givenName: Luis foaf_name: Colina, Luis foaf_surname: Colina - foaf_Person: foaf_givenName: Hans Ulrik foaf_name: Nørgaard-Nielsen, Hans Ulrik foaf_surname: Nørgaard-Nielsen - foaf_Person: foaf_givenName: Daniel foaf_name: Dicken, Daniel foaf_surname: Dicken - foaf_Person: foaf_givenName: Thomas R. foaf_name: Greve, Thomas R. foaf_surname: Greve - foaf_Person: foaf_givenName: Gillian foaf_name: Wright, Gillian foaf_surname: Wright - foaf_Person: foaf_givenName: Almudena foaf_name: Alonso-Herrero, Almudena foaf_surname: Alonso-Herrero - foaf_Person: foaf_givenName: Javier foaf_name: Álvarez-Márquez, Javier foaf_surname: Álvarez-Márquez - foaf_Person: foaf_givenName: Marianna foaf_name: Annunziatella, Marianna foaf_surname: Annunziatella - foaf_Person: foaf_givenName: Arjan foaf_name: Bik, Arjan foaf_surname: Bik - foaf_Person: foaf_givenName: Sarah E.I. foaf_name: Bosman, Sarah E.I. foaf_surname: Bosman - foaf_Person: foaf_givenName: Karina I. foaf_name: Caputi, Karina I. foaf_surname: Caputi - foaf_Person: foaf_givenName: Alejandro Crespo foaf_name: Gomez, Alejandro Crespo foaf_surname: Gomez - foaf_Person: foaf_givenName: Andreas foaf_name: Eckart, Andreas foaf_surname: Eckart - foaf_Person: foaf_givenName: Macarena foaf_name: Garcia-Marin, Macarena foaf_surname: Garcia-Marin - foaf_Person: foaf_givenName: Jens foaf_name: Hjorth, Jens foaf_surname: Hjorth - foaf_Person: foaf_givenName: Olivier foaf_name: Ilbert, Olivier foaf_surname: Ilbert - foaf_Person: foaf_givenName: Iris foaf_name: Jermann, Iris foaf_surname: Jermann - foaf_Person: foaf_givenName: Sarah foaf_name: Kendrew, Sarah foaf_surname: Kendrew - foaf_Person: foaf_givenName: Alvaro foaf_name: Labiano, Alvaro foaf_surname: Labiano - foaf_Person: foaf_givenName: Danial foaf_name: Langeroodi, Danial foaf_surname: Langeroodi - foaf_Person: foaf_givenName: Olivier foaf_name: Le Fevre, Olivier foaf_surname: Le Fevre - foaf_Person: foaf_givenName: Mattia foaf_name: Libralato, Mattia foaf_surname: Libralato - foaf_Person: foaf_givenName: Romain A. foaf_name: Meyer, Romain A. foaf_surname: Meyer - foaf_Person: foaf_givenName: Thibaud foaf_name: Moutard, Thibaud foaf_surname: Moutard - foaf_Person: foaf_givenName: Florian foaf_name: Peissker, Florian foaf_surname: Peissker - foaf_Person: foaf_givenName: John P. foaf_name: Pye, John P. foaf_surname: Pye - foaf_Person: foaf_givenName: Tuomo V. foaf_name: Tikkanen, Tuomo V. foaf_surname: Tikkanen - foaf_Person: foaf_givenName: Martin foaf_name: Topinka, Martin foaf_surname: Topinka - foaf_Person: foaf_givenName: Fabian foaf_name: Walter, Fabian foaf_surname: Walter - foaf_Person: foaf_givenName: Martin foaf_name: Ward, Martin foaf_surname: Ward - foaf_Person: foaf_givenName: Paul foaf_name: Van Der Werf, Paul foaf_surname: Van Der Werf - foaf_Person: foaf_givenName: Ewine F. foaf_name: Van Dishoeck, Ewine F. foaf_surname: Van Dishoeck - foaf_Person: foaf_givenName: Manuel foaf_name: Güdel, Manuel foaf_surname: Güdel - foaf_Person: foaf_givenName: Thomas foaf_name: Henning, Thomas foaf_surname: Henning - foaf_Person: foaf_givenName: Pierre Olivier foaf_name: Lagage, Pierre Olivier foaf_surname: Lagage - foaf_Person: foaf_givenName: Tom P. foaf_name: Ray, Tom P. foaf_surname: Ray - foaf_Person: foaf_givenName: Bart foaf_name: Vandenbussche, Bart foaf_surname: Vandenbussche bibo_doi: 10.1051/0004-6361/202451723 bibo_volume: 696 dct_date: 2025^xs_gYear dct_identifier: - UT:001459780300005 dct_isPartOf: - http://id.crossref.org/issn/0004-6361 - http://id.crossref.org/issn/1432-0746 dct_language: eng dct_publisher: EDP Sciences@ dct_title: 'MIRI Deep Imaging Survey (MIDIS) of the Hubble Ultra Deep Field: Survey description and early results for the galaxy population detected at 5.6 µm@' ...