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Bradley, Larry D.; Coe, Dan; Brammer, Gabriel; Furtak, Lukas J.; Larson, Rebecca L.; Kokorev, Vasily; Andrade-Santos, Felipe; Bhatawdekar, Rachana; Bradač, Maruša; Broadhurst, Tom; Carnall, Adam; Conselice, Christopher J.; Diego, Jose M.; Frye, Brenda; Fujimoto, Seiji; Hsiao, Tiger Y.-Y; Hutchison, Taylor A.; Jung, Intae; Mahler, Guillaume; McCandliss, Stephan; Oguri, Masamune; Postman, Marc; Sharon, Keren; Trenti, M.; Vanzella, Eros; Welch, Brian; Windhorst, Rogier A.; Zitrin, Adi
The Astrophysical journal, 09/2023, Letnik: 955, Številka: 1Journal Article
Abstract 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 μ m, plus nine Hubble Space Telescope filters spanning 0.4–1.7 μ m. 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.
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