期刊
NEW ASTRONOMY REVIEWS
卷 44, 期 7-9, 页码 477-481出版社
ELSEVIER SCI LTD
DOI: 10.1016/S1387-6473(00)00083-X
关键词
galaxies : active; quasars : general; quasars : absorption lines; X-rays : galaxies
The idea that some of the unusual features in the X-ray spectra of Narrow-Line Seyfert 1 galaxies (NLS1s) are due to the steep X-ray continuum is tested by comparing photoionization model calculations with various observed properties of Seyfert 1 galaxies. A meaningful comparison must involve the careful use of the right X-ray ionization parameter, designated here U(oxygen). When this is done, it is found that the strength of the continuum absorption features is insensitive to the exact slope of the 0.1-50 keV continuum. It is also shown that the complex of iron L-shell lines near 1 keV can produce strong absorption and emission features, depending on the gas distribution and line widths. While this may explain some unusual X-ray features in AGN, the predicted intensity of the features do not distinguish NLS1s from broader line sources. Finally, acceleration of highly ionized gas, by X-ray radiation pressure, is also not sensitive to the exact slope of the X-ray continuum. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
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