Soft X-ray properties of Seyfert galaxies. I - Spectra

Details Soft X-ray properties of Seyfert galaxies. I - Spectra Soft X-ray properties of Seyfert galaxies. I - Spectra

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...74..347k&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 74, Oct. 1990, p. 347-388.

Astronomy and Astrophysics

Astronomy

115

Astronomical Spectroscopy, Seyfert Galaxies, X Ray Astronomy, Active Galactic Nuclei, Heao 2, Proportional Counters, Radio Astronomy, X Ray Spectra

Scientific paper

Results are presented from a study of soft X-ray spectra of 75 Seyfert galaxies observed by the Einstein Observatory IPC. The spectra in this sample (mostly high-luminosity Seyfert type 1s) are found to be consistent with a single power-law index alpha = 81. The AGN spectra observed with the IPC are compared with those from higher energy experiments, where AGN spectra have power law indices alpha = 0.7. It is found that the IPC spectra are systematically steeper than the HEAO 1 A-2 spectra of the same Seyfert galaxies, indicating a flattening toward higher energies.

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