## THE ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: CONTINUUM NUMBER COUNTS, RESOLVED 1.2 mm EXTRAGALACTIC BACKGROUND, AND PROPERTIES OF THE FAINTEST DUSTY STAR-FORMING GALAXIES

### Description

We present an analysis of a deep (1σ = 13 μJy) cosmological 1.2 mm continuum map based on ASPECS, the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field. In the 1 arcmin2 covered by ASPECS we detect nine sources at $\gt 3.5\sigma$ significance at 1.2 mm. Our ALMA-selected sample has a median redshift of $z=1.6\pm 0.4$, with only one galaxy detected at z > 2 within the survey area. This value is significantly lower than that found in millimeter samples selected at a higher flux density...[Show more]

dc.contributor.author Aravena, M. Decarli, Roberto Walter, F. da Cunha, Elisabete Bauer, F. E. Carilli, C L Daddi, E Elbaz, David Ivison, Robert J Riechers, Dominik Smail, Ian 2018-11-29T22:52:44Z 2018-11-29T22:52:44Z 0004-637X http://hdl.handle.net/1885/152264 We present an analysis of a deep (1σ = 13 μJy) cosmological 1.2 mm continuum map based on ASPECS, the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field. In the 1 arcmin2 covered by ASPECS we detect nine sources at $\gt 3.5\sigma$ significance at 1.2 mm. Our ALMA-selected sample has a median redshift of $z=1.6\pm 0.4$, with only one galaxy detected at z > 2 within the survey area. This value is significantly lower than that found in millimeter samples selected at a higher flux density cutoff and similar frequencies. Most galaxies have specific star formation rates (SFRs) similar to that of main-sequence galaxies at the same epoch, and we find median values of stellar mass and SFRs of $4.0\times {10}^{10}\ {M}_{\odot }$ and $\sim 40\,{M}_{\odot }$ yr−1, respectively. Using the dust emission as a tracer for the interstellar medium (ISM) mass, we derive depletion times that are typically longer than 300 Myr, and we find molecular gas fractions ranging from ~0.1 to 1.0. As noted by previous studies, these values are lower than those using CO-based ISM estimates by a factor of ~2. The 1 mm number counts (corrected for fidelity and completeness) are in agreement with previous studies that were typically restricted to brighter sources. With our individual detections only, we recover 55% ± 4% of the extragalactic background light (EBL) at 1.2 mm measured by the Planck satellite, and we recover 80% ± 7% of this EBL if we include the bright end of the number counts and additional detections from stacking. The stacked contribution is dominated by galaxies at $z\sim 1\mbox{--}2$, with stellar masses of (1–3) × 1010 M ${}_{\odot }$. For the first time, we are able to characterize the population of galaxies that dominate the EBL at 1.2 mm. application/pdf IOP Publishing The Astrophysical Journal THE ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: CONTINUUM NUMBER COUNTS, RESOLVED 1.2 mm EXTRAGALACTIC BACKGROUND, AND PROPERTIES OF THE FAINTEST DUSTY STAR-FORMING GALAXIES Journal article Imported from ARIES 833 2016 020110 - Stellar Astronomy and Planetary Systems u5227626xPUB24 Published Version Aravena, M., Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales Decarli, Roberto, Max-Planck Institut fur Astronomie Walter, F., Max Planck Institut fur Astronomie da Cunha, Elisabete, College of Science, ANU Bauer, F. E., Pontificia Universidad Católica de Chile Carilli, C L, National Radio Astronomy Observatory Daddi, E, CEA-Saclay Elbaz, David, CEA/DSM-CNRS-Universite Paris Diderot, Irfu/Service d’Astrophysique Ivison, Robert J, Royal Observatory Edinburgh Riechers, Dominik, Cornell University Smail, Ian, Durham University 1 10.3847/1538-4357/833/1/68 2018-11-29T07:48:22Z 000393677500001 Open Access ANU Research Publications