Messanae Universitas Studiorum

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.

    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
    Divisions: UNSPECIFIED
    Depositing User: Mr Nunzio Femminò
    Date Deposited: 18 Apr 2014 10:20
    Last Modified: 18 Apr 2014 10:20
    URI: http://cab.unime.it/mus/id/eprint/5179

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