 |
 |
Astron. Astrophys. 362, 426-434 (2000)
The nature of powerful compact radio galaxies *
M.-P. Véron-Cetty 1,
L. Woltjer 1,
L. Staveley-Smith 2 and
R.D. Ekers 2
1 Observatoire de Haute Provence,CNRS, 04870 Saint-Michel l'Observatoire, France
2 Australia Telescope National Facility, CSIRO, P.O. Box 76, Epping, NSW 2121 Australia
Received 3 July 2000 / Accepted 31 August 2000
Abstract
Three compact powerful radio galaxies, PKS 1353- 341, PKS 1814-637 and PKS 1934-638, have been imaged. The three galaxies seem to be giant ellipticals, the last two being bluer than normal gEs by 0.2-0.3 mag in B-I, which is expected if they are the result of recent merging.
HI absorption has been detected in all three objects with very different characteristics. The broad absorption in PKS 1353 -341 probably takes place in a torus or a disk with a radius of at least a few tens of pc. For PKS 1814-637 the principal absorption is less broad and the disk radius more likely a few hundreds of pc. The absorption in PKS 1934-638 is very narrow and is probably due to gas not directly connected to the central engine.
Data for a dozen of powerful radio galaxies with H I absorption are reviewed. Such absorption seems to be particularly common at high radio power.
Key words: galaxies: individual: PKS 1353-341,
PKS 1814-637,
PKS 1934-638 
radio lines: galaxies
* Based on observations obtained with the Australia Telescope and the 3.6m and NTT telescopes of ESO La Silla (Chile)
Send offprint requests to: M.-P. Véron-Cetty (mira@obs-hp.fr)
Contents
- 1. Introduction
- 2. Optical observations
- 2.1. PKS 1353-341
- 2.2. PKS 1814-637
- 2.3. PKS 1934-638
- 2.4. Discussion
- 3. Neutral hydrogen observations
- 3.1. ATCA observations
- 3.2. LBA observations
- 3.3. Results
- 4. Discussion
- 4.1. General discussion
- 4.2. Discussion of our results
- 5. Conclusions
- Acknowledgements
- Appendix
- References
© European Southern Observatory (ESO) 2000
Online publication: October 24, 2000
helpdesk@link.springer.de