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Astron. Astrophys. 330, L37-L40 (1998)
Letter to the Editor
Are ultra-luminous infrared galaxies
the dominant extragalactic population at high luminosities?
Gopal Krishna 1 and
Peter L. Biermann 2
1 National Centre for Radio Astrophysics, Tata Institute of
Fundamental Research, Pune University Campus, Pune 411007, India
2 Max-Planck-Institut für Radioastronomie, Auf dem
Hügel 69, D-53121 Bonn, Germany (e-mail:
plbiermann@mpifr-bonn.mpg.de)
Received 29 August 1997 / Accepted 20 November 1997
Abstract
Based on the recent QSO surveys it is shown that, contrary to the widespread notion, high-luminousity QSOs are at least as numerous in the nearby universe as the ultraluminous far-infrared galaxies (ULIGs). Therefore, the fraction of ULIGs that have got a hidden quasar at the nucleus, for example in the dust shrouded phase, cannot be overwhelmingly large.
Key words: galaxies:
interactions 
galaxies: luminosity
function
galaxies:
starburst
galaxies:
active
quasars:
general
infrared: galaxies
Send offprint requests to: Gopal Krishna
(e-mail: krishna@ncra.tifr.res.in)
Contents
- 1. Introduction
- 2. How dominant is the ULIG population?
- 3. Local luminosity functions: QSOs versus ULIGs
- 4. Summary
- Acknowledgements
- References
© European Southern Observatory (ESO) 1998
Online publication: January 16, 1998
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