TY - JOUR
T1 - Extensive Lensing Survey of Optical and Near-infrared Dark Objects (El Sonido): HST H-faint Galaxies behind 101 Lensing Clusters
AU - Sun, Fengwu
AU - Egami, Eiichi
AU - Pérez-González, Pablo G.
AU - Smail, Ian
AU - Caputi, Karina I.
AU - Bauer, Franz E.
AU - Rawle, Timothy D.
AU - Fujimoto, Seiji
AU - Kohno, Kotaro
AU - Dudzevičiūtė, Ugnė
AU - Atek, Hakim
AU - Bianconi, Matteo
AU - Chapman, Scott C.
AU - Combes, Francoise
AU - Jauzac, Mathilde
AU - Jolly, Jean-Baptiste
AU - Koekemoer, Anton M.
AU - Magdis, Georgios E.
AU - Rodighiero, Giulia
AU - Rujopakarn, Wiphu
AU - Schaerer, Daniel
AU - Steinhardt, Charles L.
AU - Van der Werf, Paul
AU - Walth, Gregory L.
AU - Weaver, John R.
PY - 2021
Y1 - 2021
N2 - We present a Spitzer/IRAC survey of H-faint (H160 ≳ 26.4, < 5σ) sources in 101 lensing cluster fields. Across a CANDELS/Wide-like survey area of ∼648 arcmin2 (effectively ∼221 arcmin2 in the source plane), we have securely discovered 53 sources in the IRAC Channel-2 band (CH2, 4.5 μm;
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 μm known so far (CH2 = 20.48 ± 0.03 AB mag). We show that the H-faint sources in our sample are massive (median Mstar = 1010.3±0.3 M⊙), star-forming (median star formation rate M⊙ yr−1), and dust-obscured (AV = 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 (Re,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 ∼ 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 (Re,circ ∼ 1 kpc). These H-faint galaxies make up % of the galaxies in the stellar-mass range of 1010 − 1011.2 M⊙ at z = 3 ∼ 5, contributing to % of the cosmic star formation rate density in this epoch and likely tracing the early phase of massive galaxy formation.
AB - We present a Spitzer/IRAC survey of H-faint (H160 ≳ 26.4, < 5σ) sources in 101 lensing cluster fields. Across a CANDELS/Wide-like survey area of ∼648 arcmin2 (effectively ∼221 arcmin2 in the source plane), we have securely discovered 53 sources in the IRAC Channel-2 band (CH2, 4.5 μm;
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 μm known so far (CH2 = 20.48 ± 0.03 AB mag). We show that the H-faint sources in our sample are massive (median Mstar = 1010.3±0.3 M⊙), star-forming (median star formation rate M⊙ yr−1), and dust-obscured (AV = 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 (Re,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 ∼ 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 (Re,circ ∼ 1 kpc). These H-faint galaxies make up % of the galaxies in the stellar-mass range of 1010 − 1011.2 M⊙ at z = 3 ∼ 5, contributing to % of the cosmic star formation rate density in this epoch and likely tracing the early phase of massive galaxy formation.
U2 - 10.3847/1538-4357/ac2578
DO - 10.3847/1538-4357/ac2578
M3 - Journal article
SN - 0004-637X
VL - 922
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 114
ER -