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

Nissim Kanekar·Jayaram N. Chengalur
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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 $5σ$ upper limit on the mass of any associated galaxy is $M_{\rm HI} \lesssim 10^7 M_\odot$, nearly 3 orders of magnitude less than M$_{\rm HI}^\star$. 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.

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Nissim Kanekar, Jayaram N. Chengalur. 2004-11-29. The strange case of a sub-DLA with very little HI. https://doi.org/10.1051/0004-6361%3A200400111

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