SIMBAD references

2001A&A...368..797P - Astronomy and Astrophysics, volume 368, 797-816 (2001/3-4)

Soft X-ray properties of a spectroscopically selected sample of interacting and isolated Seyfert galaxies.

PFEFFERKORN F., BOLLER T. and RAFANELLI P.

Abstract (from CDS):

We present a catalogue of ROSAT detected sources in the sample of spectroscopically selected Seyfert 1 and Seyfert 2 galaxies of Rafanelli et al. (1995AJ....109.1546R). The catalogue contains 102 Seyfert 1 and 36 Seyfert 2 galaxies. The identification is based on X-ray contour maps overlaid on optical images taken from the Digitized Sky Survey. We have derived the basic spectral and timing properties of the X-ray detected Seyfert galaxies. For Seyfert 1 galaxies a strong correlation between photon index and X-ray luminosity is detected. We confirm the presence of generally steeper X-ray continua in narrow-line Seyfert 1 galaxies (NLS1s) compared to broad-line Seyfert 1 galaxies. Seyfert 2 galaxies show photon indices similar to those of NLS1s. Whereas a tendency for an increasing X-ray luminosity with increasing interaction strength is found for Seyfert 1 galaxies, such a correlation is not found for Seyfert 2 galaxies. For Seyfert 1 galaxies we found also a strong correlation for increasing far-infrared luminosity with increasing interaction strength. Both NLS1s and Seyfert 2 galaxies show the highest values of far-infrared luminosity compared to Seyfert 1 galaxies, suggesting that NLS1s and Seyfert 2 galaxies host strong (circumnuclear) star formation. For variable Seyfert galaxies we present the X-ray light curves obtained from the ROSAT All-Sky Survey and from ROSAT PSPC and HRI pointed observations. Besides the expected strong short- and long-term X-ray variability in Seyfert 1 galaxies, we find indications for X-ray flux variations in Seyfert 2 galaxies.

Abstract Copyright:

Journal keyword(s): catalogs - galaxies: active - galaxies: interactions - galaxies: Seyfert - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/A+A/368/797): seyfert1.dat seyfert2.dat figures.dat figs1/* figs2/*>

Simbad objects: 140

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