Physical properties of galaxies and the UV Luminosity Function from $z\sim6$ to $z\sim14$ in COSMOS-Web

Caitlin M. Casey; Hollis B. Akins; Olivier Ilbert; Marko Shuntov; Steven L. Finkelstein; Louise Paquereau; Andreas L. Faisst; Anton M. Koekemoer; Michaela Hirschmann; Sebastiano Cantarella; Nicole E. Drakos; Stephen M. Wilkins; Henry Joy McCracken; Jeyhan S. Kartaltepe; Claudia Maraston; Fatemeh Abedini; Mark J. Achenbach; Rafael C. Arango-Toro; Fabrizio Gentile; Ghassem Gozaliasl; Kohei Inayoshi; Darshan Kakkad; Atousa Kalantari; Ali Ahmad Khostovan; Vasily Kokorev; Erini Lambrides; Gavin Leroy; Richard Massey; Bahram Mobasher; Sophie L. Newman; Jason Rhodes; R. Michael Rich; Brant E. Robertson; David B. Sanders; Takumi S. Tanaka; Aswin P. Vijayan; John R. Weaver; Lilan Yang; Si-Yue Yu

Physical properties of galaxies and the UV Luminosity Function from $z\sim6$ to $z\sim14$ in COSMOS-Web

Caitlin M. Casey
, Hollis B. Akins
, Olivier Ilbert
, Marko Shuntov
, Steven L. Finkelstein
, Louise Paquereau
, Andreas L. Faisst
, Anton M. Koekemoer
, Michaela Hirschmann
, Sebastiano Cantarella
, Nicole E. Drakos
, Stephen M. Wilkins
, Henry Joy McCracken
, Jeyhan S. Kartaltepe
, Claudia Maraston
, Fatemeh Abedini
, Mark J. Achenbach
, Rafael C. Arango-Toro
, Fabrizio Gentile
, Ghassem Gozaliasl

Kohei Inayoshi, Darshan Kakkad, Atousa Kalantari, Ali Ahmad Khostovan, Vasily Kokorev, Erini Lambrides, Gavin Leroy, Richard Massey, Bahram Mobasher, Sophie L. Newman, Jason Rhodes, R. Michael Rich, Brant E. Robertson, David B. Sanders, Takumi S. Tanaka, Aswin P. Vijayan, John R. Weaver, Lilan Yang, Si-Yue Yu

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Abstract

We present measurements of the rest-frame ultraviolet luminosity function (UVLF) in three redshift bins over $z\sim5.5$-14 from the JWST COSMOS-Web survey. Our samples, selected using the dropout technique in the HST/ACS F814W, JWST/NIRCam F115W, and F150W filters, contain a total of 3099 galaxies spanning a wide luminosity range from faint ($M_{\rm UV}\sim-19$ mag) to bright ($M_{\rm UV}\sim-22.5$ mag). The galaxies are undergoing rapid star formation, with blue stellar populations. Surprisingly, their median UV spectral slope $β$ does not evolve at $z>8$, suggesting minimal dust, or physical separation of dust and star formation at early epochs. The measured UVLF exhibits an excess at the bright-end ($M_{\rm UV}

Original language	English
Journal	The Astrophysical Journal
Publication status	Published - 6 Aug 2025

Keywords

astro-ph.GA

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2508.04791v1

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Casey, C. M., Akins, H. B., Ilbert, O., Shuntov, M., Finkelstein, S. L., Paquereau, L., Faisst, A. L., Koekemoer, A. M., Hirschmann, M., Cantarella, S., Drakos, N. E., Wilkins, S. M., McCracken, H. J., Kartaltepe, J. S., Maraston, C., Abedini, F., Achenbach, M. J., Arango-Toro, R. C., Gentile, F., ... Yu, S.-Y. (2025). Physical properties of galaxies and the UV Luminosity Function from $z\sim6$ to $z\sim14$ in COSMOS-Web. The Astrophysical Journal.

@article{2c7c4e80c1394d2683805d039419c893,

title = "Physical properties of galaxies and the UV Luminosity Function from \$z\textbackslash{}sim6\$ to \$z\textbackslash{}sim14\$ in COSMOS-Web",

abstract = "We present measurements of the rest-frame ultraviolet luminosity function (UVLF) in three redshift bins over \$z\textbackslash{}sim5.5\$-14 from the JWST COSMOS-Web survey. Our samples, selected using the dropout technique in the HST/ACS F814W, JWST/NIRCam F115W, and F150W filters, contain a total of 3099 galaxies spanning a wide luminosity range from faint (\$M\_\{\textbackslash{}rm UV\}\textbackslash{}sim-19\$ mag) to bright (\$M\_\{\textbackslash{}rm UV\}\textbackslash{}sim-22.5\$ mag). The galaxies are undergoing rapid star formation, with blue stellar populations. Surprisingly, their median UV spectral slope \$β\$ does not evolve at \$z>8\$, suggesting minimal dust, or physical separation of dust and star formation at early epochs. The measured UVLF exhibits an excess at the bright-end (\$M\_\{\textbackslash{}rm UV\}",

keywords = "astro-ph.GA",

author = "Casey, \{Caitlin M.\} and Akins, \{Hollis B.\} and Olivier Ilbert and Marko Shuntov and Finkelstein, \{Steven L.\} and Louise Paquereau and Faisst, \{Andreas L.\} and Koekemoer, \{Anton M.\} and Michaela Hirschmann and Sebastiano Cantarella and Drakos, \{Nicole E.\} and Wilkins, \{Stephen M.\} and McCracken, \{Henry Joy\} and Kartaltepe, \{Jeyhan S.\} and Claudia Maraston and Fatemeh Abedini and Achenbach, \{Mark J.\} and Arango-Toro, \{Rafael C.\} and Fabrizio Gentile and Ghassem Gozaliasl and Kohei Inayoshi and Darshan Kakkad and Atousa Kalantari and Khostovan, \{Ali Ahmad\} and Vasily Kokorev and Erini Lambrides and Gavin Leroy and Richard Massey and Bahram Mobasher and Newman, \{Sophie L.\} and Jason Rhodes and Rich, \{R. Michael\} and Robertson, \{Brant E.\} and Sanders, \{David B.\} and Tanaka, \{Takumi S.\} and Vijayan, \{Aswin P.\} and Weaver, \{John R.\} and Lilan Yang and Si-Yue Yu",

note = "35 pages, 17 figures, submitted to ApJ",

year = "2025",

month = aug,

day = "6",

language = "English",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

}

Casey, CM, Akins, HB, Ilbert, O, Shuntov, M, Finkelstein, SL, Paquereau, L, Faisst, AL, Koekemoer, AM, Hirschmann, M, Cantarella, S, Drakos, NE, Wilkins, SM, McCracken, HJ, Kartaltepe, JS, Maraston, C, Abedini, F, Achenbach, MJ, Arango-Toro, RC, Gentile, F, Gozaliasl, G, Inayoshi, K, Kakkad, D, Kalantari, A, Khostovan, AA, Kokorev, V, Lambrides, E, Leroy, G, Massey, R, Mobasher, B, Newman, SL, Rhodes, J, Rich, RM, Robertson, BE, Sanders, DB, Tanaka, TS, Vijayan, AP, Weaver, JR, Yang, L & Yu, S-Y 2025, 'Physical properties of galaxies and the UV Luminosity Function from $z\sim6$ to $z\sim14$ in COSMOS-Web', The Astrophysical Journal.

TY - JOUR

T1 - Physical properties of galaxies and the UV Luminosity Function from $z\sim6$ to $z\sim14$ in COSMOS-Web

AU - Casey, Caitlin M.

AU - Akins, Hollis B.

AU - Ilbert, Olivier

AU - Shuntov, Marko

AU - Finkelstein, Steven L.

AU - Paquereau, Louise

AU - Faisst, Andreas L.

AU - Koekemoer, Anton M.

AU - Hirschmann, Michaela

AU - Cantarella, Sebastiano

AU - Drakos, Nicole E.

AU - Wilkins, Stephen M.

AU - McCracken, Henry Joy

AU - Kartaltepe, Jeyhan S.

AU - Maraston, Claudia

AU - Abedini, Fatemeh

AU - Achenbach, Mark J.

AU - Arango-Toro, Rafael C.

AU - Gentile, Fabrizio

AU - Gozaliasl, Ghassem

AU - Inayoshi, Kohei

AU - Kakkad, Darshan

AU - Kalantari, Atousa

AU - Khostovan, Ali Ahmad

AU - Kokorev, Vasily

AU - Lambrides, Erini

AU - Leroy, Gavin

AU - Massey, Richard

AU - Mobasher, Bahram

AU - Newman, Sophie L.

AU - Rhodes, Jason

AU - Rich, R. Michael

AU - Robertson, Brant E.

AU - Sanders, David B.

AU - Tanaka, Takumi S.

AU - Vijayan, Aswin P.

AU - Weaver, John R.

AU - Yang, Lilan

AU - Yu, Si-Yue

N1 - 35 pages, 17 figures, submitted to ApJ

PY - 2025/8/6

Y1 - 2025/8/6

N2 - We present measurements of the rest-frame ultraviolet luminosity function (UVLF) in three redshift bins over $z\sim5.5$-14 from the JWST COSMOS-Web survey. Our samples, selected using the dropout technique in the HST/ACS F814W, JWST/NIRCam F115W, and F150W filters, contain a total of 3099 galaxies spanning a wide luminosity range from faint ($M_{\rm UV}\sim-19$ mag) to bright ($M_{\rm UV}\sim-22.5$ mag). The galaxies are undergoing rapid star formation, with blue stellar populations. Surprisingly, their median UV spectral slope $β$ does not evolve at $z>8$, suggesting minimal dust, or physical separation of dust and star formation at early epochs. The measured UVLF exhibits an excess at the bright-end ($M_{\rm UV}

AB - We present measurements of the rest-frame ultraviolet luminosity function (UVLF) in three redshift bins over $z\sim5.5$-14 from the JWST COSMOS-Web survey. Our samples, selected using the dropout technique in the HST/ACS F814W, JWST/NIRCam F115W, and F150W filters, contain a total of 3099 galaxies spanning a wide luminosity range from faint ($M_{\rm UV}\sim-19$ mag) to bright ($M_{\rm UV}\sim-22.5$ mag). The galaxies are undergoing rapid star formation, with blue stellar populations. Surprisingly, their median UV spectral slope $β$ does not evolve at $z>8$, suggesting minimal dust, or physical separation of dust and star formation at early epochs. The measured UVLF exhibits an excess at the bright-end ($M_{\rm UV}

KW - astro-ph.GA

M3 - Article

SN - 0004-637X

JO - The Astrophysical Journal

JF - The Astrophysical Journal

ER -

Physical properties of galaxies and the UV Luminosity Function from $z\sim6$ to $z\sim14$ in COSMOS-Web

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