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Astron. Astrophys. 330, L37-L40 (1998)

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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


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)


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© European Southern Observatory (ESO) 1998

Online publication: January 16, 1998