TY - JOUR
T1 - High-redshift Galaxy Candidates at z = 9-10 as Revealed by JWST Observations of WHL0137-08
AU - Bradley, Larry D.
AU - Coe, Dan
AU - Brammer, Gabriel
AU - Furtak, Lukas J.
AU - Larson, Rebecca L.
AU - Kokorev, Vasily
AU - Andrade-Santos, Felipe
AU - Bhatawdekar, Rachana
AU - Bradač, Maruša
AU - Broadhurst, Tom
AU - Carnall, Adam
AU - Conselice, Christopher J.
AU - Diego, Jose M.
AU - Frye, Brenda
AU - Fujimoto, Seiji
AU - Hsiao, Tiger Y.Y.
AU - Hutchison, Taylor A.
AU - Jung, Intae
AU - Mahler, Guillaume
AU - McCandliss, Stephan
AU - Oguri, Masamune
AU - Postman, Marc
AU - Sharon, Keren
AU - Trenti, M.
AU - Vanzella, Eros
AU - Welch, Brian
AU - Windhorst, Rogier A.
AU - Zitrin, Adi
N1 - Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/9/1
Y1 - 2023/9/1
N2 - We report the discovery of four galaxy candidates observed 450-600 Myr after the Big Bang with photometric redshifts between z ∼ 8.3 and 10.2 measured using James Webb Space Telescope (JWST) NIRCam imaging of the galaxy cluster WHL0137−08 observed in eight filters spanning 0.8-5.0 μm, plus nine Hubble Space Telescope filters spanning 0.4-1.7 μm. One candidate is gravitationally lensed with a magnification of μ ∼ 8, while the other three are located in a nearby NIRCam module with expected magnifications of μ ≲ 1.1. Using SED fitting, we estimate the stellar masses of these galaxies are typically in the range log M ⋆ / M ⊙ = 8.3-8.7. All appear young, with mass-weighted ages <240 Myr, low dust content A V < 0.15 mag, and specific star formation rates sSFR ∼0.25-10 Gyr−1 for most. One z ∼ 9 candidate is consistent with an age <5 Myr and an sSFR ∼10 Gyr−1, as inferred from a strong F444W excess, implying [O iii ]+H β rest-frame equivalent width ∼2000 Å, although an older z ∼ 10 object is also allowed. Another z ∼ 9 candidate is lensed into an arc 2.″4 long with a magnification of μ ∼ 8. This arc is the most spatially resolved galaxy at z ∼ 9 known to date, revealing structures ∼30 pc across. Follow-up spectroscopy of WHL0137−08 with JWST/NIRSpec will be useful to spectroscopically confirm these high-redshift galaxy candidates and to study their physical properties in more detail.
AB - We report the discovery of four galaxy candidates observed 450-600 Myr after the Big Bang with photometric redshifts between z ∼ 8.3 and 10.2 measured using James Webb Space Telescope (JWST) NIRCam imaging of the galaxy cluster WHL0137−08 observed in eight filters spanning 0.8-5.0 μm, plus nine Hubble Space Telescope filters spanning 0.4-1.7 μm. One candidate is gravitationally lensed with a magnification of μ ∼ 8, while the other three are located in a nearby NIRCam module with expected magnifications of μ ≲ 1.1. Using SED fitting, we estimate the stellar masses of these galaxies are typically in the range log M ⋆ / M ⊙ = 8.3-8.7. All appear young, with mass-weighted ages <240 Myr, low dust content A V < 0.15 mag, and specific star formation rates sSFR ∼0.25-10 Gyr−1 for most. One z ∼ 9 candidate is consistent with an age <5 Myr and an sSFR ∼10 Gyr−1, as inferred from a strong F444W excess, implying [O iii ]+H β rest-frame equivalent width ∼2000 Å, although an older z ∼ 10 object is also allowed. Another z ∼ 9 candidate is lensed into an arc 2.″4 long with a magnification of μ ∼ 8. This arc is the most spatially resolved galaxy at z ∼ 9 known to date, revealing structures ∼30 pc across. Follow-up spectroscopy of WHL0137−08 with JWST/NIRSpec will be useful to spectroscopically confirm these high-redshift galaxy candidates and to study their physical properties in more detail.
UR - https://www.scopus.com/pages/publications/85172813377
U2 - 10.3847/1538-4357/acecfe
DO - 10.3847/1538-4357/acecfe
M3 - Article
AN - SCOPUS:85172813377
SN - 0004-637X
VL - 955
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 13
ER -