Multi-band Optical and Near-infrared Properties of Faint Submillimeter Galaxies with Serendipitous ALMA Detections. (arXiv:1812.04108v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Patil_P/0/1/0/all/0/1">Pallavi Patil</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nyland_K/0/1/0/all/0/1">Kristina Nyland</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lacy_M/0/1/0/all/0/1">Mark Lacy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Farrah_D/0/1/0/all/0/1">Duncan Farrah</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Afonso_J/0/1/0/all/0/1">Jos&#xe9; Afonso</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barkhouse_W/0/1/0/all/0/1">Wayne Barkhouse</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Surace_J/0/1/0/all/0/1">Jason Surace</a>

We present a catalog of 26 faint submillimeter galaxies (SMGs) in the XMM-LSS
field identified by cross-matching serendipitously detected sources in archival
ALMA Band 6 and 7 data with multi-band 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 submm fluxes ($0.1,{rm mJy} < S_{rm 1,mm} < 1,{rm mJy}$). In addition to the 26 SMGs with multi-band optical and NIR detections, there are 60 highly-reliable ($>5sigma$) ALMA sources with no
counterpart in any other band down to an IRAC [4.5] $AB$ magnitude of $approx
23.7$. 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 $langle z rangle = 2.66$. 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.

We present a catalog of 26 faint submillimeter galaxies (SMGs) in the XMM-LSS
field identified by cross-matching serendipitously detected sources in archival
ALMA Band 6 and 7 data with multi-band 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 submm fluxes ($0.1,{rm mJy} < S_{rm 1,mm}
< 1,{rm mJy}$). In addition to the 26 SMGs with multi-band optical and NIR
detections, there are 60 highly-reliable ($>5sigma$) ALMA sources with no
counterpart in any other band down to an IRAC [4.5] $AB$ magnitude of $approx
23.7$. 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 $langle z rangle = 2.66$. 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.

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