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Issue A&A
Volume 429, Number 3, January III 2005
Page(s) L51 - L54
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200400111



A&A 429, L51-L54 (2005)
DOI: 10.1051/0004-6361:200400111

Letter

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

N. Kanekar1 and J. N. Chengalur2

1  Kapteyn Astronomical Institute, University of Groningen, Post Bag 800, 9700 AV Groningen, The Netherlands
    e-mail: nissim@astro.rug.nl
2  National Centre for Radio Astrophysics, Post Bag 3, Ganeshkhind Pune - 411 007, India
    e-mail: chengalu@ncra.tifr.res.in

(Received 5 November 2004 / Accepted 26 November 2004 )

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


Key words: galaxies: evolution -- galaxies: formation -- galaxies: ISM -- cosmology: observations -- radio lines: galaxies

SIMBAD Objects



© ESO 2005


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