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ALMA Lensing Cluster Survey: Full Spectral Energy Distribution Analysis of z ∼ 0.5–6 Lensed Galaxies Detected with millimeter Observations.

Authors :
Uematsu, Ryosuke
Ueda, Yoshihiro
Kohno, Kotaro
Toba, Yoshiki
Yamada, Satoshi
Smail, Ian
Umehata, Hideki
Fujimoto, Seiji
Hatsukade, Bunyo
Ao, Yiping
Bauer, Franz Erik
Brammer, Gabriel
Dessauges-Zavadsky, Miroslava
Espada, Daniel
Jolly, Jean-Baptiste
Koekemoer, Anton M.
Kokorev, Vasily
Magdis, Georgios E.
Oguri, Masamune
Sun, Fengwu
Source :
Astrophysical Journal. 4/20/2024, Vol. 965 Issue 2, p1-21. 21p.
Publication Year :
2024

Abstract

Sub/millimeter galaxies are a key population for the study of galaxy evolution because the majority of star formation at high redshifts occurred in galaxies deeply embedded in dust. To search for this population, we have performed an extensive survey with Atacama Large Millimeter/submillimeter Array (ALMA), called the ALMA Lensing Cluster Survey (ALCS). This survey covers 133 arcmin2 area and securely detects 180 sources at z ∼ 0.5–6 with a flux limit of ∼0.2 mJy at 1.2 mm. Here, we report the results of multiwavelength spectral energy distribution analysis of the whole ALCS sample, utilizing the observed-frame UV to millimeter photometry. We find that the majority of the ALCS sources lie on the star-forming main sequence, with a smaller fraction showing intense starburst activities. The ALCS sample contains high infrared-excess sources ( IRX = log (L dust / L UV) > 1 ), including two extremely dust-obscured galaxies (IRX > 5). We also confirm that the ALCS sample probes a broader range in lower dust mass than conventional submillimeter galaxy samples in the same redshift range. We identify six heavily obscured active galactic nucleus (AGN) candidates that are not detected in the archival Chandra data in addition to the three X-ray AGNs reported by Uematsu et al. (2023). The inferred AGN luminosity density shows a possible excess at z = 2–3 compared with that determined from X-ray surveys below 10 keV. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0004637X
Volume :
965
Issue :
2
Database :
Academic Search Index
Journal :
Astrophysical Journal
Publication Type :
Academic Journal
Accession number :
176558081
Full Text :
https://doi.org/10.3847/1538-4357/ad26f7