Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web

Maximilien Franco; Hollis B. Akins; Caitlin M. Casey; Steven L. Finkelstein; Marko Shuntov; Katherine Chworowsky; Andreas L. Faisst; Seiji Fujimoto; Olivier Ilbert; Anton M. Koekemoer; Daizhong Liu; Christopher C. Lovell; Claudia Maraston; Henry Joy McCracken; Jed McKinney; Brant E. Robertson; Micaela B. Bagley; Jaclyn B. Champagne; Olivia R. Cooper; Xuheng Ding; Nicole E. Drakos; Andrea Enia; Steven Gillman; Ghassem Gozaliasl; Santosh Harish; Christopher C. Hayward; Michaela Hirschmann; Shuowen Jin; Jeyhan S. Kartaltepe; Vasily Kokorev; Clotilde Laigle; Arianna S. Long; Georgios Magdis; Guillaume Mahler; Crystal L. Martin; Richard Massey; Bahram Mobasher; Louise Paquereau; Alvio Renzini; Jason Rhodes; R. Michael Rich; Kartik Sheth; John D. Silverman; Martin Sparre; Margherita Talia; Benny Trakhtenbrot; Francesco Valentino; Aswin P. Vijayan; Stephen M. Wilkins; Lilan Yang; Jorge A. Zavala

doi:10.3847/1538-4357/ad5e6a

Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web

Maximilien Franco, Hollis B. Akins, Caitlin M. Casey, Steven L. Finkelstein, Marko Shuntov, Katherine Chworowsky, Andreas L. Faisst, Seiji Fujimoto, Olivier Ilbert, Anton M. Koekemoer, Daizhong Liu, Christopher C. Lovell, Claudia Maraston, Henry Joy McCracken, Jed McKinney, Brant E. Robertson, Micaela B. Bagley, Jaclyn B. Champagne, Olivia R. Cooper, Xuheng DingNicole E. Drakos, Andrea Enia, Steven Gillman, Ghassem Gozaliasl, Santosh Harish, Christopher C. Hayward, Michaela Hirschmann, Shuowen Jin, Jeyhan S. Kartaltepe, Vasily Kokorev, Clotilde Laigle, Arianna S. Long, Georgios Magdis, Guillaume Mahler, Crystal L. Martin, Richard Massey, Bahram Mobasher, Louise Paquereau, Alvio Renzini, Jason Rhodes, R. Michael Rich, Kartik Sheth, John D. Silverman, Martin Sparre, Margherita Talia, Benny Trakhtenbrot, Francesco Valentino, Aswin P. Vijayan, Stephen M. Wilkins, Lilan Yang, Jorge A. Zavala

School of Physics and Astronomy

Tel Aviv University

Research output: Contribution to journal › Article › peer-review

Abstract

We report the identification of 15 galaxy candidates at z ≥ 9 using the initial COSMOS-Web JWST observations over 77 arcmin² through four Near Infrared Camera filters (F115W, F150W, F277W, and F444W) with an overlap with the Mid-Infrared Imager (F770W) of 8.7 arcmin². We fit the sample using several publicly available spectral energy distribution (SED) fitting and photometric redshift codes and determine their redshifts between z = 9.3 and z = 10.9 (〈z〉 = 10.0), UV magnitudes between M _UV = −21.2 and −19.5 (with 〈M _UV〉 = −20.2), and rest-frame UV slopes (〈β〉 = −2.4). These galaxies are, on average, more luminous than most z ≥ 9 candidates discovered by JWST so far in the literature, while exhibiting similar blue colors in their rest-frame UV. The rest-frame UV slopes derived from SED fitting are blue (β ∼ [−2.0, −2.7]) without reaching extremely blue values as reported in other recent studies at these redshifts. The blue color is consistent with models that suggest the underlying stellar population is not yet fully enriched in metals like similarly luminous galaxies in the lower-redshift Universe. The derived stellar masses with 〈 log 10 ( M _⋆/M _⊙)〉 ≈ 8-9 are not in tension with the standard Lambda cold dark matter (ΛCDM) model, and our measurement of the volume density of such UV-luminous galaxies aligns well with previously measured values presented in the literature at z ∼ 9-10. Our sample of galaxies, although compact, is significantly resolved.

Original language	English
Article number	23
Journal	Astrophysical Journal
Volume	973
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ad5e6a
State	Published - 1 Sep 2024

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/ad5e6a

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Franco, M., Akins, H. B., Casey, C. M., Finkelstein, S. L., Shuntov, M., Chworowsky, K., Faisst, A. L., Fujimoto, S., Ilbert, O., Koekemoer, A. M., Liu, D., Lovell, C. C., Maraston, C., McCracken, H. J., McKinney, J., Robertson, B. E., Bagley, M. B., Champagne, J. B., Cooper, O. R., ... Zavala, J. A. (2024). Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web. Astrophysical Journal, 973(1), Article 23. https://doi.org/10.3847/1538-4357/ad5e6a

@article{7bc71e547bf24e83b421cd51dd0fa0f8,

title = "Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web",

abstract = "We report the identification of 15 galaxy candidates at z ≥ 9 using the initial COSMOS-Web JWST observations over 77 arcmin2 through four Near Infrared Camera filters (F115W, F150W, F277W, and F444W) with an overlap with the Mid-Infrared Imager (F770W) of 8.7 arcmin2. We fit the sample using several publicly available spectral energy distribution (SED) fitting and photometric redshift codes and determine their redshifts between z = 9.3 and z = 10.9 (〈z〉 = 10.0), UV magnitudes between M UV = −21.2 and −19.5 (with 〈M UV〉 = −20.2), and rest-frame UV slopes (〈β〉 = −2.4). These galaxies are, on average, more luminous than most z ≥ 9 candidates discovered by JWST so far in the literature, while exhibiting similar blue colors in their rest-frame UV. The rest-frame UV slopes derived from SED fitting are blue (β ∼ [−2.0, −2.7]) without reaching extremely blue values as reported in other recent studies at these redshifts. The blue color is consistent with models that suggest the underlying stellar population is not yet fully enriched in metals like similarly luminous galaxies in the lower-redshift Universe. The derived stellar masses with 〈 log 10 ( M ⋆/M ⊙)〉 ≈ 8-9 are not in tension with the standard Lambda cold dark matter (ΛCDM) model, and our measurement of the volume density of such UV-luminous galaxies aligns well with previously measured values presented in the literature at z ∼ 9-10. Our sample of galaxies, although compact, is significantly resolved.",

author = "Maximilien Franco and Akins, {Hollis B.} and Casey, {Caitlin M.} and Finkelstein, {Steven L.} and Marko Shuntov and Katherine Chworowsky and Faisst, {Andreas L.} and Seiji Fujimoto and Olivier Ilbert and Koekemoer, {Anton M.} and Daizhong Liu and Lovell, {Christopher C.} and Claudia Maraston and McCracken, {Henry Joy} and Jed McKinney and Robertson, {Brant E.} and Bagley, {Micaela B.} and Champagne, {Jaclyn B.} and Cooper, {Olivia R.} and Xuheng Ding and Drakos, {Nicole E.} and Andrea Enia and Steven Gillman and Ghassem Gozaliasl and Santosh Harish and Hayward, {Christopher C.} and Michaela Hirschmann and Shuowen Jin and Kartaltepe, {Jeyhan S.} and Vasily Kokorev and Clotilde Laigle and Long, {Arianna S.} and Georgios Magdis and Guillaume Mahler and Martin, {Crystal L.} and Richard Massey and Bahram Mobasher and Louise Paquereau and Alvio Renzini and Jason Rhodes and Rich, {R. Michael} and Kartik Sheth and Silverman, {John D.} and Martin Sparre and Margherita Talia and Benny Trakhtenbrot and Francesco Valentino and Vijayan, {Aswin P.} and Wilkins, {Stephen M.} and Lilan Yang and Zavala, {Jorge A.}",

note = "Publisher Copyright: {\textcopyright} 2024. The Author(s). Published by the American Astronomical Society.",

year = "2024",

month = sep,

day = "1",

doi = "10.3847/1538-4357/ad5e6a",

language = "الإنجليزيّة",

volume = "973",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

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Franco, M, Akins, HB, Casey, CM, Finkelstein, SL, Shuntov, M, Chworowsky, K, Faisst, AL, Fujimoto, S, Ilbert, O, Koekemoer, AM, Liu, D, Lovell, CC, Maraston, C, McCracken, HJ, McKinney, J, Robertson, BE, Bagley, MB, Champagne, JB, Cooper, OR, Ding, X, Drakos, NE, Enia, A, Gillman, S, Gozaliasl, G, Harish, S, Hayward, CC, Hirschmann, M, Jin, S, Kartaltepe, JS, Kokorev, V, Laigle, C, Long, AS, Magdis, G, Mahler, G, Martin, CL, Massey, R, Mobasher, B, Paquereau, L, Renzini, A, Rhodes, J, Rich, RM, Sheth, K, Silverman, JD, Sparre, M, Talia, M, Trakhtenbrot, B, Valentino, F, Vijayan, AP, Wilkins, SM, Yang, L & Zavala, JA 2024, 'Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web', Astrophysical Journal, vol. 973, no. 1, 23. https://doi.org/10.3847/1538-4357/ad5e6a

TY - JOUR

T1 - Unveiling the Distant Universe

T2 - Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web

AU - Franco, Maximilien

AU - Akins, Hollis B.

AU - Casey, Caitlin M.

AU - Finkelstein, Steven L.

AU - Shuntov, Marko

AU - Chworowsky, Katherine

AU - Faisst, Andreas L.

AU - Fujimoto, Seiji

AU - Ilbert, Olivier

AU - Koekemoer, Anton M.

AU - Liu, Daizhong

AU - Lovell, Christopher C.

AU - Maraston, Claudia

AU - McCracken, Henry Joy

AU - McKinney, Jed

AU - Robertson, Brant E.

AU - Bagley, Micaela B.

AU - Champagne, Jaclyn B.

AU - Cooper, Olivia R.

AU - Ding, Xuheng

AU - Drakos, Nicole E.

AU - Enia, Andrea

AU - Gillman, Steven

AU - Gozaliasl, Ghassem

AU - Harish, Santosh

AU - Hayward, Christopher C.

AU - Hirschmann, Michaela

AU - Jin, Shuowen

AU - Kartaltepe, Jeyhan S.

AU - Kokorev, Vasily

AU - Laigle, Clotilde

AU - Long, Arianna S.

AU - Magdis, Georgios

AU - Mahler, Guillaume

AU - Martin, Crystal L.

AU - Massey, Richard

AU - Mobasher, Bahram

AU - Paquereau, Louise

AU - Renzini, Alvio

AU - Rhodes, Jason

AU - Rich, R. Michael

AU - Sheth, Kartik

AU - Silverman, John D.

AU - Sparre, Martin

AU - Talia, Margherita

AU - Trakhtenbrot, Benny

AU - Valentino, Francesco

AU - Vijayan, Aswin P.

AU - Wilkins, Stephen M.

AU - Yang, Lilan

AU - Zavala, Jorge A.

PY - 2024/9/1

Y1 - 2024/9/1

N2 - We report the identification of 15 galaxy candidates at z ≥ 9 using the initial COSMOS-Web JWST observations over 77 arcmin2 through four Near Infrared Camera filters (F115W, F150W, F277W, and F444W) with an overlap with the Mid-Infrared Imager (F770W) of 8.7 arcmin2. We fit the sample using several publicly available spectral energy distribution (SED) fitting and photometric redshift codes and determine their redshifts between z = 9.3 and z = 10.9 (〈z〉 = 10.0), UV magnitudes between M UV = −21.2 and −19.5 (with 〈M UV〉 = −20.2), and rest-frame UV slopes (〈β〉 = −2.4). These galaxies are, on average, more luminous than most z ≥ 9 candidates discovered by JWST so far in the literature, while exhibiting similar blue colors in their rest-frame UV. The rest-frame UV slopes derived from SED fitting are blue (β ∼ [−2.0, −2.7]) without reaching extremely blue values as reported in other recent studies at these redshifts. The blue color is consistent with models that suggest the underlying stellar population is not yet fully enriched in metals like similarly luminous galaxies in the lower-redshift Universe. The derived stellar masses with 〈 log 10 ( M ⋆/M ⊙)〉 ≈ 8-9 are not in tension with the standard Lambda cold dark matter (ΛCDM) model, and our measurement of the volume density of such UV-luminous galaxies aligns well with previously measured values presented in the literature at z ∼ 9-10. Our sample of galaxies, although compact, is significantly resolved.

AB - We report the identification of 15 galaxy candidates at z ≥ 9 using the initial COSMOS-Web JWST observations over 77 arcmin2 through four Near Infrared Camera filters (F115W, F150W, F277W, and F444W) with an overlap with the Mid-Infrared Imager (F770W) of 8.7 arcmin2. We fit the sample using several publicly available spectral energy distribution (SED) fitting and photometric redshift codes and determine their redshifts between z = 9.3 and z = 10.9 (〈z〉 = 10.0), UV magnitudes between M UV = −21.2 and −19.5 (with 〈M UV〉 = −20.2), and rest-frame UV slopes (〈β〉 = −2.4). These galaxies are, on average, more luminous than most z ≥ 9 candidates discovered by JWST so far in the literature, while exhibiting similar blue colors in their rest-frame UV. The rest-frame UV slopes derived from SED fitting are blue (β ∼ [−2.0, −2.7]) without reaching extremely blue values as reported in other recent studies at these redshifts. The blue color is consistent with models that suggest the underlying stellar population is not yet fully enriched in metals like similarly luminous galaxies in the lower-redshift Universe. The derived stellar masses with 〈 log 10 ( M ⋆/M ⊙)〉 ≈ 8-9 are not in tension with the standard Lambda cold dark matter (ΛCDM) model, and our measurement of the volume density of such UV-luminous galaxies aligns well with previously measured values presented in the literature at z ∼ 9-10. Our sample of galaxies, although compact, is significantly resolved.

UR - http://www.scopus.com/inward/record.url?scp=85203982891&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ad5e6a

DO - 10.3847/1538-4357/ad5e6a

M3 - مقالة

SN - 0004-637X

VL - 973

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 23

ER -

Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web

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