Astrophys. J., 871, 109-109 (2019/January-3)
Multiband optical and near-infrared properties of faint submillimeter galaxies with serendipitous ALMA detections.
PATIL P., NYLAND K., LACY M., FARRAH D., AFONSO J., BARKHOUSE W. and SURACE J.
Abstract (from CDS):
We present a catalog of 26 faint submillimeter galaxies (SMGs) in the XMM Large Scale Structure (XMM-LSS) field identified by cross-matching serendipitously detected sources in archival pre-Atacama Large Millimeter Array (ALMA) band 6 and 7 data with multiband near-infrared (NIR) and optical data from the Spitzer Extragalactic Representative Volume Survey, the VISTA Deep Extragalactic Survey, the Canada-France-Hawaii Telescope Legacy Large Survey, and the Hyper Suprime-Cam Subaru Strategic Program. Of the 26 SMGs in our sample, 15 are identified here for the first time. The majority of the sources in our sample (16/26) have faint submillimeter fluxes (0.1 mJy < S1mm < 1 mJy). In addition to the 26 SMGs with multiband optical and NIR detections, there are 60 highly reliable (>5σ) ALMA sources with no counterpart in any other band down to an Infrared Array Camera (IRAC) [4.5] AB magnitude of ≃23.7. To further characterize the 26 galaxies with both ALMA and optical/NIR counterparts, we provide 13-band forced photometry for the entire catalog using the Tractor and calculate photometric redshifts and rest-frame colors. The median redshift of our sample is <z>=2.66. We find that our sample galaxies have bluer colors compared to bright SMGs, and the UVJ color plot indicates that their colors are consistent with main-sequence star-forming galaxies. Our results provide new insights into the nature of the faint population of SMGs and also highlight opportunities for galaxy evolution studies based on archival ALMA data.
© 2019. The American Astronomical Society. All rights reserved.
galaxies: evolution - galaxies: high-redshift - galaxies: photometry - galaxies: star formation - submillimeter: galaxies
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