A&A 429, L51-L54 (2005)
The strange case of a sub-DLA with very little HIN. Kanekar1 and J. N. Chengalur2
1 Kapteyn Astronomical Institute, University of Groningen, Post Bag 800, 9700 AV Groningen, The Netherlands
2 National Centre for Radio Astrophysics, Post Bag 3, Ganeshkhind Pune - 411 007, India
(Received 5 November 2004 / Accepted 26 November 2004 )
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 upper limit on the mass of any associated galaxy is , nearly 3 orders of magnitude less than . The 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
© ESO 2005