The diversity of soft X-ray spectra in quasars

Details The diversity of soft X-ray spectra in quasars The diversity of soft X-ray spectra in quasars

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..357e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 15, 1985, p. 357-361.

Astronomy and Astrophysics

Astrophysics

77

Astronomical Spectroscopy, Quasars, X Ray Sources, X Ray Spectra, Background Radiation, Emission Spectra, Heao 2, Interstellar Matter, Power Spectra, Seyfert Galaxies

Scientific paper

Soft X-ray spectra for three quasars obtained with the Einstein Imaging Proportional Counter covering the 0.1-4.0 keV band are reported. Power-law fits to these spectra have best-fit energy indices of 1.2 +0.6 or -0.2, for the quasar NAB 0205 + 024, 0.6 +0.3 or -0.2 for the quasar B2 1028 + 313, and 2.2 + or -0.4 for the quasar PG 1211 + 143. None of the quasars shows any evidence for a column density of cold matter in excess of the galactic values. The derived spectra demonstrate that there is no single universal power law slope for quasar X-ray spectra. The implications of these results for the X-ray background, X-ray continuum emission mechanisms, and the production of the optical/UV emission lines are briefly discussed.

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