Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST

Hollis B. Akins; Caitlin M. Casey; Natalie Allen; Micaela B. Bagley; Mark Dickinson; Steven L. Finkelstein; Maximilien Franco; Santosh Harish; Pablo Arrabal Haro; Olivier Ilbert; Jeyhan S. Kartaltepe; Anton M. Koekemoer; Daizhong Liu; Arianna S. Long; Henry Joy McCracken; Louise Paquereau; Casey Papovich; Nor Pirzkal; Jason Rhodes; Brant E. Robertson; Marko Shuntov; Sune Toft; Guang Yang; Guillermo Barro; Laura Bisigello; Véronique Buat; Jaclyn B. Champagne; Olivia Cooper; Luca Costantin; Alexander de la Vega; Nicole E. Drakos; Andreas Faisst; Adriano Fontana; Seiji Fujimoto; Steven Gillman; Carlos Gómez-Guijarro; Ghassem Gozaliasl; Nimish P. Hathi; Christopher C. Hayward; Michaela Hirschmann; Benne W. Holwerda; Shuowen Jin; Dale D. Kocevski; Vasily Kokorev; Erini Lambrides; Ray A. Lucas; Georgios E. Magdis; Benjamin Magnelli; Jed McKinney; Bahram Mobasher

doi:10.3847/1538-4357/acef21

Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST

Hollis B. Akins^*, Caitlin M. Casey, Natalie Allen, Micaela B. Bagley, Mark Dickinson, Steven L. Finkelstein, Maximilien Franco, Santosh Harish, Pablo Arrabal Haro, Olivier Ilbert, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Daizhong Liu, Arianna S. Long, Henry Joy McCracken, Louise Paquereau, Casey Papovich, Nor Pirzkal, Jason Rhodes, Brant E. RobertsonMarko Shuntov, Sune Toft, Guang Yang, Guillermo Barro, Laura Bisigello, Véronique Buat, Jaclyn B. Champagne, Olivia Cooper, Luca Costantin, Alexander de la Vega, Nicole E. Drakos, Andreas Faisst, Adriano Fontana, Seiji Fujimoto, Steven Gillman, Carlos Gómez-Guijarro, Ghassem Gozaliasl, Nimish P. Hathi, Christopher C. Hayward, Michaela Hirschmann, Benne W. Holwerda, Shuowen Jin, Dale D. Kocevski, Vasily Kokorev, Erini Lambrides, Ray A. Lucas, Georgios E. Magdis, Benjamin Magnelli, Jed McKinney, Bahram Mobasher

^*Corresponding author for this work

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Abstract

We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin² of publicly available Cycle 1 data from the COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W−F444W (∼2.5 mag) and detection in MIRI/F770W (∼25 mag), we identify two galaxies, COS-z8M1 and CEERS-z7M1, that have best-fit photometric redshifts of Z= 8.4 +03 -04 and 7.6 +01 -0.1 respectively. We perform spectral energy distribution fitting with a variety of codes (including bagpipes, prospector, beagle, and cigale) and find a >95% probability that these indeed lie at z > 7. Both sources are compact (R_eff ≲ 200 pc) and highly obscured (A_V ∼ 1.5–2.5) and, at our best-fit redshift estimates, likely have strong [O iii]+Hβ emission contributing to their 4.4 μm photometry. We estimate stellar masses of ∼10¹⁰M_⊙ for both sources; by virtue of detection in MIRI at 7.7 μm, these measurements are robust to the inclusion of bright emission lines, for example, from an active galactic nucleus. We identify a marginal (2.9σ) Atacama Large Millimeter/submillimeter Array detection at 2 mm within 05 of COS-z8M1, which, if real, would suggest a remarkably high IR luminosity of ∼10¹²L_⊙. These two galaxies, if confirmed at z ∼ 8, would be extreme in their stellar and dust masses and may be representative of a substantial population of highly dust-obscured galaxies at cosmic dawn.

Original language	English
Article number	61
Journal	The Astrophysical Journal
Volume	956
Issue number	1
Number of pages	17
DOIs	https://doi.org/10.3847/1538-4357/acef21
Publication status	Published - 2023

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Akins, H. B., Casey, C. M., Allen, N., Bagley, M. B., Dickinson, M., Finkelstein, S. L., Franco, M., Harish, S., Haro, P. A., Ilbert, O., Kartaltepe, J. S., Koekemoer, A. M., Liu, D., Long, A. S., McCracken, H. J., Paquereau, L., Papovich, C., Pirzkal, N., Rhodes, J., ... Mobasher, B. (2023). Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST. The Astrophysical Journal, 956(1), Article 61. https://doi.org/10.3847/1538-4357/acef21

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title = "Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST",

abstract = "We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin2 of publicly available Cycle 1 data from the COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W−F444W (∼2.5 mag) and detection in MIRI/F770W (∼25 mag), we identify two galaxies, COS-z8M1 and CEERS-z7M1, that have best-fit photometric redshifts of Z= 8.4 +03 -04 and 7.6 +01 -0.1 respectively. We perform spectral energy distribution fitting with a variety of codes (including bagpipes, prospector, beagle, and cigale) and find a >95% probability that these indeed lie at z > 7. Both sources are compact (Reff ≲ 200 pc) and highly obscured (AV ∼ 1.5–2.5) and, at our best-fit redshift estimates, likely have strong [O iii]+Hβ emission contributing to their 4.4 μm photometry. We estimate stellar masses of ∼1010M⊙ for both sources; by virtue of detection in MIRI at 7.7 μm, these measurements are robust to the inclusion of bright emission lines, for example, from an active galactic nucleus. We identify a marginal (2.9σ) Atacama Large Millimeter/submillimeter Array detection at 2 mm within 05 of COS-z8M1, which, if real, would suggest a remarkably high IR luminosity of ∼1012L⊙. These two galaxies, if confirmed at z ∼ 8, would be extreme in their stellar and dust masses and may be representative of a substantial population of highly dust-obscured galaxies at cosmic dawn.",

author = "Akins, {Hollis B.} and Casey, {Caitlin M.} and Natalie Allen and Bagley, {Micaela B.} and Mark Dickinson and Finkelstein, {Steven L.} and Maximilien Franco and Santosh Harish and Haro, {Pablo Arrabal} and Olivier Ilbert and Kartaltepe, {Jeyhan S.} and Koekemoer, {Anton M.} and Daizhong Liu and Long, {Arianna S.} and McCracken, {Henry Joy} and Louise Paquereau and Casey Papovich and Nor Pirzkal and Jason Rhodes and Robertson, {Brant E.} and Marko Shuntov and Sune Toft and Guang Yang and Guillermo Barro and Laura Bisigello and V{\'e}ronique Buat and Champagne, {Jaclyn B.} and Olivia Cooper and Luca Costantin and Vega, {Alexander de la} and Drakos, {Nicole E.} and Andreas Faisst and Adriano Fontana and Seiji Fujimoto and Steven Gillman and Carlos G{\'o}mez-Guijarro and Ghassem Gozaliasl and Hathi, {Nimish P.} and Hayward, {Christopher C.} and Michaela Hirschmann and Holwerda, {Benne W.} and Shuowen Jin and Kocevski, {Dale D.} and Vasily Kokorev and Erini Lambrides and Lucas, {Ray A.} and Magdis, {Georgios E.} and Benjamin Magnelli and Jed McKinney and Bahram Mobasher",

year = "2023",

doi = "10.3847/1538-4357/acef21",

language = "English",

volume = "956",

journal = "The Astrophysical Journal",

publisher = "The American Astronomical Society",

number = "1",

}

Akins, HB, Casey, CM, Allen, N, Bagley, MB, Dickinson, M, Finkelstein, SL, Franco, M, Harish, S, Haro, PA, Ilbert, O, Kartaltepe, JS, Koekemoer, AM, Liu, D, Long, AS, McCracken, HJ, Paquereau, L, Papovich, C, Pirzkal, N, Rhodes, J, Robertson, BE, Shuntov, M, Toft, S, Yang, G, Barro, G, Bisigello, L, Buat, V, Champagne, JB, Cooper, O, Costantin, L, Vega, ADL, Drakos, NE, Faisst, A, Fontana, A, Fujimoto, S, Gillman, S, Gómez-Guijarro, C, Gozaliasl, G, Hathi, NP, Hayward, CC, Hirschmann, M, Holwerda, BW, Jin, S, Kocevski, DD, Kokorev, V, Lambrides, E, Lucas, RA, Magdis, GE, Magnelli, B, McKinney, J & Mobasher, B 2023, 'Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST', The Astrophysical Journal, vol. 956, no. 1, 61. https://doi.org/10.3847/1538-4357/acef21

TY - JOUR

T1 - Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST

AU - Akins, Hollis B.

AU - Casey, Caitlin M.

AU - Allen, Natalie

AU - Bagley, Micaela B.

AU - Dickinson, Mark

AU - Finkelstein, Steven L.

AU - Franco, Maximilien

AU - Harish, Santosh

AU - Haro, Pablo Arrabal

AU - Ilbert, Olivier

AU - Kartaltepe, Jeyhan S.

AU - Koekemoer, Anton M.

AU - Liu, Daizhong

AU - Long, Arianna S.

AU - McCracken, Henry Joy

AU - Paquereau, Louise

AU - Papovich, Casey

AU - Pirzkal, Nor

AU - Rhodes, Jason

AU - Robertson, Brant E.

AU - Shuntov, Marko

AU - Toft, Sune

AU - Yang, Guang

AU - Barro, Guillermo

AU - Bisigello, Laura

AU - Buat, Véronique

AU - Champagne, Jaclyn B.

AU - Cooper, Olivia

AU - Costantin, Luca

AU - Vega, Alexander de la

AU - Drakos, Nicole E.

AU - Faisst, Andreas

AU - Fontana, Adriano

AU - Fujimoto, Seiji

AU - Gillman, Steven

AU - Gómez-Guijarro, Carlos

AU - Gozaliasl, Ghassem

AU - Hathi, Nimish P.

AU - Hayward, Christopher C.

AU - Hirschmann, Michaela

AU - Holwerda, Benne W.

AU - Jin, Shuowen

AU - Kocevski, Dale D.

AU - Kokorev, Vasily

AU - Lambrides, Erini

AU - Lucas, Ray A.

AU - Magdis, Georgios E.

AU - Magnelli, Benjamin

AU - McKinney, Jed

AU - Mobasher, Bahram

PY - 2023

Y1 - 2023

N2 - We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin2 of publicly available Cycle 1 data from the COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W−F444W (∼2.5 mag) and detection in MIRI/F770W (∼25 mag), we identify two galaxies, COS-z8M1 and CEERS-z7M1, that have best-fit photometric redshifts of Z= 8.4 +03 -04 and 7.6 +01 -0.1 respectively. We perform spectral energy distribution fitting with a variety of codes (including bagpipes, prospector, beagle, and cigale) and find a >95% probability that these indeed lie at z > 7. Both sources are compact (Reff ≲ 200 pc) and highly obscured (AV ∼ 1.5–2.5) and, at our best-fit redshift estimates, likely have strong [O iii]+Hβ emission contributing to their 4.4 μm photometry. We estimate stellar masses of ∼1010M⊙ for both sources; by virtue of detection in MIRI at 7.7 μm, these measurements are robust to the inclusion of bright emission lines, for example, from an active galactic nucleus. We identify a marginal (2.9σ) Atacama Large Millimeter/submillimeter Array detection at 2 mm within 05 of COS-z8M1, which, if real, would suggest a remarkably high IR luminosity of ∼1012L⊙. These two galaxies, if confirmed at z ∼ 8, would be extreme in their stellar and dust masses and may be representative of a substantial population of highly dust-obscured galaxies at cosmic dawn.

AB - We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin2 of publicly available Cycle 1 data from the COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W−F444W (∼2.5 mag) and detection in MIRI/F770W (∼25 mag), we identify two galaxies, COS-z8M1 and CEERS-z7M1, that have best-fit photometric redshifts of Z= 8.4 +03 -04 and 7.6 +01 -0.1 respectively. We perform spectral energy distribution fitting with a variety of codes (including bagpipes, prospector, beagle, and cigale) and find a >95% probability that these indeed lie at z > 7. Both sources are compact (Reff ≲ 200 pc) and highly obscured (AV ∼ 1.5–2.5) and, at our best-fit redshift estimates, likely have strong [O iii]+Hβ emission contributing to their 4.4 μm photometry. We estimate stellar masses of ∼1010M⊙ for both sources; by virtue of detection in MIRI at 7.7 μm, these measurements are robust to the inclusion of bright emission lines, for example, from an active galactic nucleus. We identify a marginal (2.9σ) Atacama Large Millimeter/submillimeter Array detection at 2 mm within 05 of COS-z8M1, which, if real, would suggest a remarkably high IR luminosity of ∼1012L⊙. These two galaxies, if confirmed at z ∼ 8, would be extreme in their stellar and dust masses and may be representative of a substantial population of highly dust-obscured galaxies at cosmic dawn.

U2 - 10.3847/1538-4357/acef21

DO - 10.3847/1538-4357/acef21

M3 - Journal article

VL - 956

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

M1 - 61

ER -

Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST

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