Extensive Lensing Survey of Optical and Near-Infrared Dark Objects (El Sonido): HST H-Faint Galaxies behind 101 Lensing Clusters

Abstract

We present a Spitzer/IRAC survey of H-faint ($H_{160}\gtrsim 26.4$, $<5\sigma$) sources in 101 lensing cluster fields. Across a CANDELS/Wide-like survey area of $\sim$648 arcmin${}^2$ (effectively $\sim$221 arcmin${}^2$ in the source plane), we have securely discovered 53 sources in the IRAC Channel-2 band (CH2, 4.5 $\mu \mathrm{m}$; median CH2$=22.46\pm 0.11$ 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 $\mu \mathrm{m}$ known so far ($CH2=20.48\pm 0.03$ AB mag). We show that the H-faint sources in our sample are massive (median $M_{\mathrm{star}}=10^{10.3\pm 0.3}$ $M_{\odot }$), star-forming (median star formation rate $=100_{-40}^{+60}$ $M_{\odot }$yr${}^{-1}$) and dust-obscured ($A_V=2.6\pm 0.3$) galaxies around a median photometric redshift of $z=3.9\pm 0.4$. The stellar continua of 14 H-faint galaxies can be resolved in the CH2 band, suggesting a median circularized effective radius ($R_{\mathrm{e},\mathrm{circ}}$; lensing corrected) of $1.9\pm 0.2$ kpc and $<1.5$ kpc for the resolved and whole samples, respectively. This is consistent with the sizes of massive unobscured galaxies at $z\sim 4$, 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 ($R_{\mathrm{e},\mathrm{circ}}\sim 1$ kpc). These H-faint galaxies make up $16_{-7}^{+13}$% of the galaxies in the stellar mass range of $10^{10}-10^{11.2}$ $M_{\odot }$ at $z=3\sim 5$, 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.

26 pages, 10 figures, 3 tables. Accepted for publication in ApJ

References in corpus (34)

• Cosmic Star Formation History
• EAZY: A Fast, Public Photometric Redshift Code
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• The Herschel view of the dominant mode of galaxy growth from z=4 to the present day
• A Dust-Obscured Massive Maximum-Starburst Galaxy at a Redshift of 6.34
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• Kiloparsec-scale dust disks in high-redshift luminous submillimeter galaxies
• Hubble Space Telescope Combined Strong and Weak Lensing Analysis of the CLASH Sample: Mass and Magnification Models and Systematic Uncertainties
• Galaxy growth in a massive halo in the first billion years of cosmic history
• The FourStar Galaxy Evolution Survey (ZFOURGE): ultraviolet to far-infrared catalogs, medium-bandwidth photometric redshifts with improved accuracy, stellar masses, and confirmation of quiescent galaxies to z~3.5
• Mass and magnification maps for the Hubble Space Telescope Frontier Fields clusters: implications for high redshift studies
• Dust temperature and mid-to-total infrared color distributions for star-forming galaxies at 0<z<4
• The Evolution of the IR Luminosity Function and Dust-obscured Star Formation in the Last 13 Billion Years
• The Field Substellar Mass Function Based on the Full-sky 20-pc Census of 525 L, T, and Y Dwarfs
• Are Dusty Galaxies Blue? Insights on UV Attenuation from Dust-Selected Galaxies
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: Near-infrared morphologies and stellar sizes
• ISM properties of a Massive Dusty Star-Forming Galaxy discovered at z ~ 7
• Hubble Frontier Fields : A High Precision Strong Lensing Analysis of Galaxy Cluster MACSJ0416.1-2403 using ~200 Multiple Images
• An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Source catalogue and properties
• An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: High-resolution dust continuum morphologies and the link between sub-millimetre galaxies and spheroid formation
• The Diversity and Variability of Star Formation Histories in Models of Galaxy Evolution
• The Size Evolution of Star-forming Galaxies Since z~7 Using ZFOURGE
• Structural evolution in massive galaxies at z~2
• GOODS 850-5 -- A z>4 Galaxy Discovered in the Submillimeter?
• ALMA twenty-six arcmin${}^2$ survey of GOODS-S at one-millimeter (ASAGAO): Near-infrared-dark faint ALMA sources
• Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2
• Unveiling the oldest and most massive galaxies at very high redshift
• Probing 3D Structure with a Large MUSE Mosaic: Extending the Mass Model of Frontier Field Abell 370
• Shapes and alignments of dark matter haloes and their brightest cluster galaxies in 39 strong lensing clusters
• ALMA Deep Field in SSA22: A near-infrared-dark submillimeter galaxy at z=4.0
• ALMA 1.3 mm Survey of Lensed Submillimeter Galaxies (SMGs) Selected by Herschel: Discovery of Spatially Extended SMGs and Implications
• FIR-luminous [CII] emitters in the ALMA-SCUBA-2 COSMOS survey (AS2COSMOS): The nature of submillimeter galaxies in a 10 comoving Mpc-scale structure at z~4.6
• PdBI Cold Dust Imaging of Two Extremely Red H-[4.5]>4 Galaxies Discovered with SEDS and CANDELS