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Variable X-ray Absorption in NGC 4151

Published online by Cambridge University Press:  07 August 2017

R. S. Warwick ,
T. Yaqoob  and
K. A. Pounds
R. S. Warwick
Affiliation:
X-ray Astronomy Group, University of Leicester, Leicester LE1 7RH, United Kingdom
T. Yaqoob
Affiliation:
X-ray Astronomy Group, University of Leicester, Leicester LE1 7RH, United Kingdom
K. A. Pounds
Affiliation:
X-ray Astronomy Group, University of Leicester, Leicester LE1 7RH, United Kingdom

Extract

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The medium energy X-ray spectrum of the Seyfert galaxy NGC 4151 is characterised by a hard power-law continuum, a variable low-energy cut-off and iron line and edge features. Holt et al. (1980) found the spectral form below 4 keV to be incompatible with absorption in a uniform screen of cold gas and interpreted the apparent soft X-ray excess in terms of a partial covering model. However, recent observations point to a somewhat different description of the X-ray absorbing medium present in the nucleus of this galaxy.

Type
Part 3: X-rays and the Central Source
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 182 - 183
Copyright
Copyright © Kluwer 1989 

References

Clavel, J. et al., 1987, Astrophys. J. 321, 251 CrossRefGoogle Scholar
Ferland, G. & Rees, M., 1988, Astrophys. J., in press Google Scholar
Halpern, J., 1984, Astrophys. J. 281, 90 CrossRefGoogle Scholar
Holt, S.S. et al., 1980, Astrophys. J. 241, L13 CrossRefGoogle Scholar
Perola, G.C. et al., 1986, Astrophys. J. 306, 508 CrossRefGoogle Scholar
Pounds, K.A. et al., 1986, Mon. Not. R. astr. Soc. 218, 685 CrossRefGoogle Scholar
Yaqoob, T. Warwick, R.S. & Pounds, K.A., 1988, Mon. Not. R. astr. Soc., in press.Google Scholar