A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST
We have characterized 26 Spitzer/IRAC-selected sources from the SMUVS program that are undetected in the UltraVISTA DR5 H - and/or K _s -band images, covering 94 arcmin ^2 of the COSMOS field, which have deep multiwavelength JWST photometry. We analyzed the JWST/NIRCam imaging fr...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad2c0b |
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| author | Sophie E. van Mierlo Karina I. Caputi Matthew L. N. Ashby Vasily Kokorev Rafael Navarro-Carrera Pierluigi Rinaldi |
| author_facet | Sophie E. van Mierlo Karina I. Caputi Matthew L. N. Ashby Vasily Kokorev Rafael Navarro-Carrera Pierluigi Rinaldi |
| author_sort | Sophie E. van Mierlo |
| collection | DOAJ |
| description | We have characterized 26 Spitzer/IRAC-selected sources from the SMUVS program
that are undetected in the UltraVISTA DR5 H -
and/or K _s -band images, covering 94 arcmin ^2 of the COSMOS field,
which have deep multiwavelength JWST photometry. We analyzed the JWST/NIRCam
imaging from the PRIMER survey and ancillary HST data to reveal the properties
of these galaxies from spectral energy distribution (SED) fitting. We find that
the majority of these galaxies are detected by NIRCam at λ < 2 μ m, with only four
remaining as near-infrared dropouts in the deeper JWST images. Our results
indicate that the UltraVISTA dropouts candidates are primarily located at z > 3 and are characterized by high dust
extinctions, with a typical color excess E ( B − V ) = 0.5 ± 0.3 and
stellar mass $\mathrm{log}({M}_{* }/{M}_{\odot })=9.5\pm 1.0$ . Remarkably, ∼75% of these sources show a flux enhancement
between the observed photometry and modeled continuum SED that can be attributed
to H α emission in the corresponding NIRCam bands.
The derived (H α + N [ ii ] + S
[ ii ]) rest-frame equivalent widths and H α star formation rates (SFRs) span values ∼100–2200 Å and ∼5–375 M _⊙ yr ^−1 , respectively. The locations of these sources on
the SFR– M _* plane indicate that 35% of them are starbursts, 40% are
main-sequence galaxies, and the remaining 25% are located in the star formation
valley. Our sample includes one active galactic nucleus and six submillimeter
sources, as revealed from ancillary X-ray and submillimeter photometry. The high
dust extinctions combined with the flux boosting from H α emission explain why these sources are relatively bright Spitzer
galaxies and yet unidentified in the ultradeep UltraVISTA near-infrared
images. |
| format | Article |
| id | doaj-art-e7d28d7059eb4926b4098d86abb3d5cd |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-e7d28d7059eb4926b4098d86abb3d5cd2025-08-20T01:55:12ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0196611210.3847/1538-4357/ad2c0bA High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWSTSophie E. van Mierlo0https://orcid.org/0000-0001-8289-2863Karina I. Caputi1https://orcid.org/0000-0001-8183-1460Matthew L. N. Ashby2https://orcid.org/0000-0002-3993-0745Vasily Kokorev3https://orcid.org/0000-0002-5588-9156Rafael Navarro-Carrera4https://orcid.org/0000-0001-6066-4624Pierluigi Rinaldi5https://orcid.org/0000-0002-5104-8245Kapteyn Astronomical Institute, University of Groningen , PO Box 800, 9700 AV Groningen, The Netherlands ; mierlo@astro.rug.nlKapteyn Astronomical Institute, University of Groningen , PO Box 800, 9700 AV Groningen, The Netherlands ; mierlo@astro.rug.nl; Cosmic Dawn Center (DAWN) , DenmarkOptical and Infrared Astronomy Division Center for Astrophysics ∣ Harvard & Smithsonian Cambridge , MA 02138, USAKapteyn Astronomical Institute, University of Groningen , PO Box 800, 9700 AV Groningen, The Netherlands ; mierlo@astro.rug.nlKapteyn Astronomical Institute, University of Groningen , PO Box 800, 9700 AV Groningen, The Netherlands ; mierlo@astro.rug.nlKapteyn Astronomical Institute, University of Groningen , PO Box 800, 9700 AV Groningen, The Netherlands ; mierlo@astro.rug.nlWe have characterized 26 Spitzer/IRAC-selected sources from the SMUVS program that are undetected in the UltraVISTA DR5 H - and/or K _s -band images, covering 94 arcmin ^2 of the COSMOS field, which have deep multiwavelength JWST photometry. We analyzed the JWST/NIRCam imaging from the PRIMER survey and ancillary HST data to reveal the properties of these galaxies from spectral energy distribution (SED) fitting. We find that the majority of these galaxies are detected by NIRCam at λ < 2 μ m, with only four remaining as near-infrared dropouts in the deeper JWST images. Our results indicate that the UltraVISTA dropouts candidates are primarily located at z > 3 and are characterized by high dust extinctions, with a typical color excess E ( B − V ) = 0.5 ± 0.3 and stellar mass $\mathrm{log}({M}_{* }/{M}_{\odot })=9.5\pm 1.0$ . Remarkably, ∼75% of these sources show a flux enhancement between the observed photometry and modeled continuum SED that can be attributed to H α emission in the corresponding NIRCam bands. The derived (H α + N [ ii ] + S [ ii ]) rest-frame equivalent widths and H α star formation rates (SFRs) span values ∼100–2200 Å and ∼5–375 M _⊙ yr ^−1 , respectively. The locations of these sources on the SFR– M _* plane indicate that 35% of them are starbursts, 40% are main-sequence galaxies, and the remaining 25% are located in the star formation valley. Our sample includes one active galactic nucleus and six submillimeter sources, as revealed from ancillary X-ray and submillimeter photometry. The high dust extinctions combined with the flux boosting from H α emission explain why these sources are relatively bright Spitzer galaxies and yet unidentified in the ultradeep UltraVISTA near-infrared images.https://doi.org/10.3847/1538-4357/ad2c0bHigh-redshift galaxiesStar formationJames Webb Space Telescope |
| spellingShingle | Sophie E. van Mierlo Karina I. Caputi Matthew L. N. Ashby Vasily Kokorev Rafael Navarro-Carrera Pierluigi Rinaldi A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST The Astrophysical Journal High-redshift galaxies Star formation James Webb Space Telescope |
| title | A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST |
| title_full | A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST |
| title_fullStr | A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST |
| title_full_unstemmed | A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST |
| title_short | A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST |
| title_sort | high incidence of dusty hα emitters at z 3 among ultravista dropout galaxies in cosmos revealed by jwst |
| topic | High-redshift galaxies Star formation James Webb Space Telescope |
| url | https://doi.org/10.3847/1538-4357/ad2c0b |
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