SCUBA-2 ultra deep imaging EAO survey (STUDIES). IV. spatial clustering and halo masses of submillimeter galaxies
| Autor: | Ian Smail, J. M. Simpson, Wei-Hao Wang, Yiping Ao, Luis C. Ho, Scott Chapman, Thomas R. Greve, Chian-Chou Chen, Douglas Scott, Arif Babul, Andrew Bunker, Ho Seong Hwang, Xinwen Shu, M. P. Koprowski, Yoshiki Toba, Sungwook E. Hong, David L. Clements, Chen-Fatt Lim, Michał J. Michałowski, Hyunjin Shim, Yen-Ting Lin, Yu-Yen Chang, Wei-Leong Tee, Christopher J. Conselice, Yu Gao |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
PASSIVE GALAXIES
MU-M Astrophysics Astronomy & Astrophysics Submillimetre astronomy Clustering Photometry (optics) Galaxy evolution Large-scale structure of the universe BOLOMETER CAMERA 0201 Astronomical and Space Sciences Galaxy formation and evolution STAR-FORMING GALAXIES Physics REDSHIFT SURVEY 0306 Physical Chemistry (incl. Structural) Galaxy formation Science & Technology LARGE-SCALE ALMA SURVEY Astronomy and Astrophysics Redshift survey Galaxy Red shift LYMAN-BREAK GALAXIES Space and Planetary Science Physical Sciences 0202 Atomic Molecular Nuclear Particle and Plasma Physics Spatial clustering High-redshift galaxies LUMINOSITY DEPENDENCE Halo Submillimeter astronomy COSMOLOGY LEGACY SURVEY |
| Popis: | We analyze an extremely deep 450 μm image (1σ = 0.56 mJy beam−1) of a sime300 arcmin2 area in the CANDELS/COSMOS field as part of the Sub-millimeter Common User Bolometric Array-2 Ultra Deep Imaging EAO Survey. We select a robust (signal-to-noise ratio ≥4) and flux-limited (≥4 mJy) sample of 164 submillimeter galaxies (SMGs) at 450 μm that have K-band counterparts in the COSMOS2015 catalog identified from radio or mid-infrared imaging. Utilizing this SMG sample and the 4705 K-band-selected non-SMGs that reside within the noise level ≤1 mJy beam−1 region of the 450 μm image as a training set, we develop a machine-learning classifier using K-band magnitude and color–color pairs based on the 13-band photometry available in this field. We apply the trained machine-learning classifier to the wider COSMOS field (1.6 deg2) using the same COSMOS2015 catalog and identify a sample of 6182 SMG candidates with similar colors. The number density, radio and/or mid-infrared detection rates, redshift and stellar-mass distributions, and the stacked 450 μm fluxes of these SMG candidates, from the S2COSMOS observations of the wide field, agree with the measurements made in the much smaller CANDELS field, supporting the effectiveness of the classifier. Using this SMG candidate sample, we measure the two-point autocorrelation functions from z = 3 down to z = 0.5. We find that the SMG candidates reside in halos with masses of sime(2.0 ± 0.5) × 1013 h −1 M ☉ across this redshift range. We do not find evidence of downsizing that has been suggested by other recent observational studies. |
| Databáze: | OpenAIRE |
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