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Extreme Starburst or Central Activity in X-Ray Luminous IRAS Galaxies

Published online by Cambridge University Press:  26 July 2016

Th. Boller  and
M. Dennefeld
Th. Boller
Affiliation:
Max-Planck Institut für Extraterrestrische Physik, D-85748 Garching bei München, Germany
M. Dennefeld
Affiliation:
Institut d'Astrophysique, 98 bis Boulevard Arago, F-75014 Paris, France

Abstract

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ROSAT All Sky Survey observations of IRAS galaxies have revealed up to now a number of (10) optically non-Seyfert galaxies with X-ray (0.1–2.4 keV) luminosities up to a few 1043erg · s −1 (Boller et al. 1992). The sources are brighter than previous detection limits of a few 1041 erg · s −1 as found by Stocke et al. (1991) or Green, Anderson & Ward (1992) for Einstein sources. The optical classification is based on follow-up observations which indicate clearly the non-Seyfert (LINER and HII region-like galaxies) nature. Our investigations reveal that galaxies classified as non-Seyferts on the basis of optical spectroscopy may reach exceptionally high X-ray luminosities which are similar to that of Seyfert galaxies. On the basis of the present observational material we suppose a hidden low luminosity AGN in the centre of these objects as the source of energy production. The objects are of interest when evaluating starburst versus central activity.

Type
Part Thirteen: Properties and Clustering of Galaxies and Clusters
Information
Symposium - International Astronomical Union , Volume 161: Astronomy from Wide-Field Imaging , 1994 , pp. 662 - 663
Copyright
Copyright © Kluwer 1994 

References

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