[CII] 158 Micron Emission from z~4 HI Absorption-Selected Galaxies. (arXiv:1812.06113v1 [astro-ph.GA])

[CII] 158 Micron Emission from z~4 HI Absorption-Selected Galaxies. (arXiv:1812.06113v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Neeleman_M/0/1/0/all/0/1">Marcel Neeleman</a> (MPIA), <a href="http://arxiv.org/find/astro-ph/1/au:+Kanekar_N/0/1/0/all/0/1">Nissim Kanekar</a> (NCRA/TIFR), <a href="http://arxiv.org/find/astro-ph/1/au:+Prochaska_J/0/1/0/all/0/1">J. Xavier Prochaska</a> (UCSC/Kavli IPMU), <a href="http://arxiv.org/find/astro-ph/1/au:+Rafelski_M/0/1/0/all/0/1">Marc A. Rafelski</a> (STScI/JHU), <a href="http://arxiv.org/find/astro-ph/1/au:+Carilli_C/0/1/0/all/0/1">Chris L. Carilli</a> (NRAO)

We report on a search for the [CII] 158 micron emission line from galaxies
associated with four high-metallicity damped Ly-alpha absorbers (DLAs) at z ~ 4
using the Atacama Large Millimeter/sub-millimeter Array (ALMA). We detect [CII]
158 micron emission from galaxies at the DLA redshift in three fields, with one
field showing two [CII] emitters. Combined with previous results, we now have
detected [CII] 158 micron emission from five of six galaxies associated with
targeted high-metallicity DLAs at z ~ 4. The galaxies have relatively large
impact parameters, ~16 – 45 kpc, [CII] 158 micron line luminosities of (0.36 –
30) x 10^8 Lsun, and rest-frame far-infrared properties similar to those of
luminous Lyman-break galaxies, with star-formation rates of ~7 – 110 Msun yr-1.
Comparing the absorption and emission line profiles yields a remarkable
agreement between the line centroids, indicating that the DLA traces gas at
velocities similar to that of the [CII] 158 micron emission. This disfavors a
scenario where the DLA arises from gas in a companion galaxy. These
observations highlight ALMA’s unique ability to uncover a high redshift galaxy
population that has largely eluded detection for decades.

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