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A study of a complete soft X-ray selected sample of AGN |
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| Authors: | Chiho Matsumoto John R Moore Karen M Leighly Dirk Grupe Beverley J Wills |
| Institution: | aDepartment of Physics and Astronomy, The University of Oklahoma, 440 W. Brooks, Norman, OK 73019, USA bAstronomy Department, The Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA cAstronomy Department, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712, USA |
| Abstract: | We present preliminary results from analyses of hard X-ray and optical observations of a soft X-ray selected sample. We created a small but complete sample with 20 of the softest and brightest objects with low Galactic absorption from the ROSAT bright soft X-ray selected radio-quiet AGN sample. This sample consists of 10 narrow-line Seyfert 1 galaxies and 10 broad-line Seyfert galaxies. We analyze ASCA data in the 0.6–10 keV band and optical spectra from ground-based telescopes. We investigate the photon indices in the hard X-ray band, soft excesses in the ASCA band, and optical emission line properties. The photon indices in the 2–10 keV band are nominal for both narrow-line Seyfert 1 galaxies and broad-line Seyfert 1 galaxies in each class compared with other heterogeneous samples. All of the narrow-line Seyfert 1 galaxies show soft excesses, but this component seems to be less significant for broad-line Seyfert 1 galaxies. There seems to be a trend of steeper X-ray spectra to be accompanied by narrower Hβ for narrow-line Seyfert 1 galaxies, but this is not extended to the larger velocity width regime of broad-line Seyfert 1 galaxies, and no clear trend is seen among them. |
| Keywords: | Soft X-ray selected AGN ASCA Seyfert 1 galaxies |
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