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Issue A&A
Volume 458, Number 1, October IV 2006
Page(s) 107 - 111
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20053591



A&A 458, 107-111 (2006)
DOI: 10.1051/0004-6361:20053591

Star-forming QSO host galaxies

P. D. Barthel

Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
    e-mail: pdb@astro.rug.nl

(Received 8 June 2005 / Accepted 26 July 2006 )

Abstract
Context.The recent finding of substantial masses of cold molecular gas as well as young stellar populations in the host galaxies of intermediate luminosity quasars is at odds with results of Hubble Space Telescope imaging studies since the latter appear to yield mature, quiescent early type hosts.
Aims.The characterization as "quiescent" for the host galaxies of QSOs is being addressed.
Methods.The radio and far-infrared properties of both the HST sample and a larger comparison sample of uv-excess selected radio-quiet QSOs are being analyzed.
Results.Consistency is found with substantial recent or ongoing star-formation activity.


Key words: quasars: general -- galaxies: starburst



© ESO 2006


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