X-ray luminous IRAS galaxies

Details X-ray luminous IRAS galaxies X-ray luminous IRAS galaxies

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.205...43b&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 205, no. 1, p. 43-47.

Astronomy and Astrophysics

Astronomy

2

Infrared Astronomy Satellite, Rosat Mission, Stellar Luminosity, X Ray Binaries, Astronomical Catalogs, Power Series, Supernova Remnants

Scientific paper

A sample of 14,708 extragalactic IRAS sources selected from the Point Source Catalog via statistical classification has been cross-correlated with the ROSAT All Sky Survey (Boller et al., 1992). A total of 244 galaxies emerge as being detected both by ROSAT and IRAS. The most interesting point is the discovery of a dozen 'normal' spirals whose X-ray luminosities reach nearly 10 exp 43 erg/s (0.1-2.4 kV), higher than previous detection limits of a few 1041 erg/s. We obtained optical spectra for nine of them, showing Seyfert spectra for three of the objects (thus previous misclassifications), spectra close to LINERs for two further objects and normal IRAS galaxy spectra for the last four. In the case of 'normal' galaxies the source of energy is not clear yet and could be related to the high rate of star formation likely to occur in the central regions or also to a low level active nucleus. The study of these objects is of interest to the nature of LINERs and, more generally, to possible relations between AGN and starbursts (Sanders et al., 1988).

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