Extensive Lensing Survey of Optical and Near-infrared Dark Objects (El Sonido): HST H-faint Galaxies behind 101 Lensing Clusters
Artikel i vetenskaplig tidskrift, 2021
We present a Spitzer/IRAC survey of H-faint (H-160 greater than or similar to 26.4, < 5 sigma) sources in 101 lensing cluster fields. Across a CANDELS/Wide-like survey area of similar to 648 arcmin(2) (effectively similar to 221 arcmin(2) in the source plane), we have securely discovered 53 sources in the IRAC Channel-2 band (CH2, 4.5 mu m; median CH2 = 22.46 +/- 0.11 AB mag) that lack robust HST/WFC3-IR F160W counterparts. The most remarkable source in our sample, namely ES-009 in the field of Abell 2813, is the brightest H-faint galaxy at 4.5 mu m known so far (CH2 = 20.48 +/- 0.03 AB mag). We show that the H-faint sources in our sample are massive (median M-star = 10 10.3 +/- 0.3 M-circle dot, star-forming (median star formation rate =1001 M-circle dot yr(-1)), and dust-obscured (A(v) = 2.6 +/- 0.3) galaxies around a median photometric redshift of z = 3.9 +/- 0.4. The stellar continua of 14 H-faint galaxies can be resolved in the CH2 band, suggesting a median circularized effective radius (R-e,R-circ; lensing corrected) of 1.9 +/- 0.2 kpc and <1.5 kpc for the resolved and whole samples, respectively. This is consistent with the sizes of massive unobscured galaxies at z similar to 4, indicating that H-faint galaxies represent the dusty tail of the distribution of a wider galaxy population. Comparing with the ALMA dust continuum sizes of similar galaxies reported previously, we conclude that the heavy dust obscuration in H-faint galaxies is related to the compactness of both stellar and dust continua (R-e,R-circ similar to 1 kpc). These H-faint galaxies make up 161 3 % of the galaxies in the stellar-mass range of 10(10) - 10(11.2) M-circle dot at z = 3 similar to 5, contributing to 8(-4)(+8)% of the cosmic star formation rate density in this epoch and likely tracing the early phase of massive galaxy formation.
Författare
Fengwu Sun
University of Arizona
Eiichi Egami
University of Arizona
Pablo G. Perez-Gonzalez
Centro de Astrobiología (INTA-CSIC)
Ian Smail
Durham University
Karina I. Caputi
Rijksuniversiteit Groningen
Köpenhamns universitet
Franz E. Bauer
Pontificia Universidad Catolica de Chile
Instituto Milenio de Astrofísica
Timothy D. Rawle
Space Telescope Science Institute (STScI)
Seiji Fujimoto
Köpenhamns universitet
Kotaro Kohno
University of Tokyo
Ugne Dudzeviciute
Durham University
Hakim Atek
Sorbonne Université
Matteo Bianconi
University of Birmingham
Scott C. Chapman
Eureka Scientific
Francoise Combes
Collège de France
Sorbonne Université
Mathilde Jauzac
Durham University
University of KwaZulu-Natal
Jean Baptiste Jolly
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Anton M. Koekemoer
Space Telescope Science Institute (STScI)
Georgios E. Magdis
Köpenhamns universitet
Danmarks Tekniske Universitet (DTU)
Giulia Rodighiero
Istituto nazionale di astrofisica (INAF)
Università di Padova
Wiphu Rujopakarn
Chulalongkorn University
National Astronomical Research Institute of Thailand
University of Tokyo
Daniel Schaerer
Université de Genève
Charles L. Steinhardt
Köpenhamns universitet
Paul Van der Werf
Universiteit Leiden
Gregory L. Walth
Carnegie Observatories
John R. Weaver
Köpenhamns universitet
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 922 2 114Ämneskategorier
Astronomi, astrofysik och kosmologi
Annan geovetenskap och miljövetenskap
Multidisciplinär geovetenskap
DOI
10.3847/1538-4357/ac2578