A Search for H-Dropout Lyman Break Galaxies at z ∼ 12–16

We present two bright galaxy candidates at z ∼ 12–13 identified in our H-dropout Lyman break selection with 2.3 deg(exp 2) near-infrared deep imaging data. These galaxy candidates, selected after careful screening of foreground interlopers, have spectral energy distributions showing a sharp disconti...

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Bibliographic Details
Published in:The Astrophysical journal 2022-04, Vol.929 (1), p.1
Main Authors: Harikane, Yuichi, Inoue, Akio K., Mawatari, Ken, Hashimoto, Takuya, Yamanaka, Satoshi, Fudamoto, Yoshinobu, Matsuo, Hiroshi, Tamura, Yoichi, Dayal, Pratika, Yung, L. Y. Aaron, Hutter, Anne, Pacucci, Fabio, Sugahara, Yuma, Koekemoer, Anton M.
Format: Article
Language:English
Subjects:
Astronomical models
Astrophysics
Galaxies
Galaxy evolution
Galaxy formation
High-redshift galaxies
Infrared imaging
James Webb Space Telescope
Luminosity
Photometry
Red shift
Space missions
Space telescopes
Star formation
Stars & galaxies
Stellar populations
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Summary:We present two bright galaxy candidates at z ∼ 12–13 identified in our H-dropout Lyman break selection with 2.3 deg(exp 2) near-infrared deep imaging data. These galaxy candidates, selected after careful screening of foreground interlopers, have spectral energy distributions showing a sharp discontinuity around 1.7 μm, a flat continuum at 2–5 μm, and nondetections at 12 galaxy. An ALMA program targeting one of the candidates shows a tentative 4σ [O III] 88 μm line at z = 13.27, in agreement with its photometric redshift estimate. The number density of the z ∼ 12–13 candidates is comparable to that of bright z ∼ 10 galaxies and is consistent with a recently proposed double-power-law luminosity function rather than the Schechter function, indicating little evolution in the abundance of bright galaxies from z ∼ 4 to 13. Comparisons with theoretical models show that the models cannot reproduce the bright end of rest-frame ultraviolet luminosity functions at z ∼ 10–13. Combined with recent studies reporting similarly bright galaxies at z ∼ 9–11 and mature stellar populations at z ∼ 6–9, our results indicate the existence of a number of star-forming galaxies at z > 10, which will be detected with upcoming space missions such as the James Webb Space Telescope, Nancy Grace Roman Space Telescope, and GREX-PLUS.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac53a9