The X-ray spectral variability of NGC 4151

Details The X-ray spectral variability of NGC 4151 The X-ray spectral variability of NGC 4151

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..773y&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 15, 1991, p. 773-786.

Astronomy and Astrophysics

Astronomy

113

Seyfert Galaxies, Variability, X Ray Sources, X Ray Spectra, Astronomical Spectroscopy, Fluorescence, Light Curve, Metallicity, Proportional Counters

Scientific paper

The paper reports results of a series of Ginga observations of the archetypal Seyfet galaxy NGC 4151 performed over a period of about 20 months from mid 1987 to early 1989. It is found that the softening of the X-ray spectrum as the source brightens is best modeled in terms of variations in the spectral index of the underlying power-law continuum; this phenomenon may be directly related to the emission processes that give rise to the broadband X-ray to gamma-ray continuum of the source. Spectral variations associated with changes in the LOS absorption are evident on time scales of months to years.

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