The strange case of a sub-DLA with very little HI

Abstract

We report a deep search for HI 21cm emission from the $z=0.00632$ sub-DLA toward PG1216+069 with the Giant Metrewave Radio Telescope. No emission was detected and our $5\sigma$ upper limit on the mass of any associated galaxy is $M_{\mathrm{HI}}\lesssim 10^7{M}_{\odot }$, nearly 3 orders of magnitude less than M${}_{\mathrm{HI}}^{\star }$. The $z\sim 0.006$ absorber is thus the most extreme known deviation from the standard paradigm in which high column density quasar absorption lines arise in the disks of gas-rich galaxies.

4 pages, 1 figure. Accepted for publication in Astronomy and Astrophysics Letters

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• ALMA + VLT observations of a Damped Lyman-α absorbing galaxy: Massive, wide CO emission, gas-rich but with very low SFR
• HI 21cm observations of the PG1216+069 sub-DLy-alpha absorber field at z=0.00632
• HI 21cm emission from the sub-damped Lyman-alpha absorber at z=0.0063 towards PG1216+069
• Constraints on the gas masses of low-z damped Lyman-$\alpha$ systems
• HI Observations of the Ca II absorbing galaxies Mrk 1456 and SDSS J211701.26-002633.7