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

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

2004-11-29

arxiv.org/abs/astro-ph/0411779v1

Astrophys.J. 429 (2005) L51

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1051/0004-6361:200400111

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 $M_{\rm HI} \lesssim 10^7 M_\odot$, 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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