other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2008MNRAS.391..765C - Mon. Not. R. Astron. Soc., 391, 765-784 (2008/December-1)
A survey for redshifted molecular and atomic absorption lines - II. Associated HI, OH and millimetre lines in the z ≳ 3 Parkes quarter-Jansky flat-spectrum sample.
CURRAN S.J., WHITING M.T., WIKLIND T., WEBB J.K., MURPHY M.T. and PURCELL C.R.
Abstract (from CDS):
The mix of 21-cm detections and non-detections is currently attributed to orientation effects, where according to unified schemes of active galactic nuclei, 21-cm absorption is more likely to occur in sources designated as radio galaxies (type 2 objects, where the nucleus is viewed through dense obscuring circumnuclear gas) than in quasars (type 1 objects, where we have a direct view to the nucleus). However, due to the exclusively high UV luminosities of our targets it is not clear whether orientation effects alone can wholly account for the distribution, although there exists the possibility that the large luminosities are indicative of a changing demographic of galaxy types. We also find that below luminosities of LUV∼ 1023W/Hz, both type 1 and type 2 objects have a 50 per cent likelihood of exhibiting 21-cm absorption.
Finally, we do not detect molecular gas in any of the sources. The lack of Hi absorption, combined with the results from Paper I, suggests these sources are not conducive to high molecular abundances.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): galaxies: abundances - galaxies: active - galaxies: high-redshift - quasars: absorption lines - cosmology: observations - radio lines: galaxies
CDS comments: Table 6: Galaxy J1357+4354 (z=0.646) not identified.
Simbad objects: 100
To bookmark this query, right click on this link: simbad:2008MNRAS.391..765C and select 'bookmark this link' or equivalent in the popup menu