Iron line emission and two-component spectral behavior in the ASCA observation of the Seyfert 1 galaxy NGC 7469

Details Iron line emission and two-component spectral behavior in the ASCA observation of the Seyfert 1 galaxy NGC 7469 Iron line emission and two-component spectral behavior in the ASCA observation of the Seyfert 1 galaxy NGC 7469

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436l..35g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 436, no. 1, p. L35-L39

Astronomy and Astrophysics

Astrophysics

30

Iron, K Lines, Seyfert Galaxies, Spectral Emission, Spectrum Analysis, X Ray Absorption, Active Galactic Nuclei, Fluorescence, Spectral Resolution

Scientific paper

The results of spectral-temporal analysis of an ASCA observation of the nearby Seyfert 1 galaxy NGC 7469 are presented providing an unprecedented combination broadband coverage and energy resolution. A narrow fluorescence line (Gaussian dispersion sigma less than 150 eV) of neutral iron was detected with equivalent width (EW) approximately equal to 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 accounted for by a warm absorber model. A good agreement with the data is obtained by modeling the soft excess either via a thermal component or by reflection by a mildly ionized medium. Correlated luminosity and spectral variability was clearly detected in the observation, the spectrum getting steeper when the luminosity increases. A detailed analysis suggests that this behavior may be due to differing degrees of variability of the soft and hard components.

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