Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..477m&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 477 - 478
Astronomy and Astrophysics
Astrophysics
1
Active Galactic Nuclei: X-Ray Background
Scientific paper
The authors have investigated the characteristics of active galactic nuclei (AGN) using data from ASCA X-ray observations. There are mainly three topics in this research: (1) the absorption edges due to warm gas which have been found in the soft X-ray spectra of AGN, especially in Seyfert 1 galaxies; (2) the iron emission line from Seyfert 1 galaxies which has revealed a broad structure in most cases and (3) the complex X-ray spectra of Seyfert 2 galaxies which showed absorption by thick gas and iron emission lines with a broad range of equivalent widths. The cosmic X-ray background (CXB) can be explained by superposing AGN spectra according to their cosmological distance but, so far, observed distant quasars (z > 1) reveal softer spectra in the 2-10 keV band than that of the CXB. Well defined X-ray spectra are now available for more than 50 AGN and the authors find that a considerable fraction of low luminosity AGN have X-ray spectra as flat as the CXB. In this paper the authors investigate which class of AGN contributes mostly to the CXB.
Cappi Massimo
Matsuoka Masaru
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