Proprietà spetrali e variabilità temporale nell'ossrvazione ASCA di NGC7469

Guainazzi, M. and Matsuoka, M. and Piro, L. and Mihara, T. and Yamauchi, M. (1994) Proprietà spetrali e variabilità temporale nell'ossrvazione ASCA di NGC7469. Accademia Peloritana dei Pericolanti, Classe di Scienze FF. MM. NN., LXXII (Supplement 1). pp. 567-573.

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Abstract

The results of a spectral-temporal analysis of an ASCA observation of the nearby Seyfert 1 galaxy NGC7469 are presented, providing an unprecedented combination of broad-band coverage and energy resolution. A narrow fluorescence line (gaussian dispersion ( $\delta < 150 eV$ ) of neutral iron was detected with equivalent width $W_\alpha \approx 120 eV$ . The iron line appears incompatible with emission from a relativistic accretion disk. The presence of a soft excess below 0.8 KeV is confirmed by the ASCA data. Moreover, this component cannot be account by a warm absorbing model. A good agreement with the data is obtained by modelling the soft excess via a thermal component or by reflection by a mildly ionized medium. Correlated luminosity and spectral variability was clearly detected in the obscrvation, the spectrum getting steeper when the luminosity increases. A detaiied anaysis suggests that this behavior may be due to differing degrees of variability of the soft and hard component.

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Item Type:	Article
Subjects:	M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Fisiche, Matematiche e Naturali > 1994 > Supplemento 1 parte 2 M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Medico-Biologiche > 1994 > Supplemento 1 parte 2 M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Giuridiche, Economiche e Politiche > 1994 > Supplemento 1 parte 2 M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Lettere Filosofia e belle Arti > 1994 > Supplemento 1 parte 2
Depositing User:	Mr Nunzio Femminò
Date Deposited:	18 Apr 2014 08:20
Last Modified:	18 Apr 2014 08:20
URI:	http://cab.unime.it/mus/id/eprint/5179

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