Another Interpretation of the Disk-Line Profile for the Seyfert 1 Galaxy MCG-6-30-15

Details Another Interpretation of the Disk-Line Profile for the Seyfert 1 Galaxy MCG-6-30-15 Another Interpretation of the Disk-Line Profile for the Seyfert 1 Galaxy MCG-6-30-15

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55..625i&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.55, No.3, pp. 625-629

Astronomy and Astrophysics

Astronomy

22

Galaxies: Individual (Mcg-6-30-15), Galaxies: Seyfert, X-Rays: Galaxies

Scientific paper

The Seyfert 1 galaxy MCG-6-30-15 is a representative object possessing a ``disk-line'' (a broad and skewed feature around 5-7keV in an X-ray spectrum). Using the longest MCG-6-30-15 observation with ASCA, Matsumoto et al. (2003, PASJ, 55, 615) found an interesting time-variability: the RMS variability as a function of a time-bin-width decreases more rapidly in the disk-line energy band (5.0-6.6keV) than those in the other energy bands, as the time-bin-width increases from ˜ 104s, to ˜ 105s. In this paper, we argue that this energy-dependent change in the RMS variability as a function of the time-bin-width is difficult to be reproduced by simply considering the variability of a ``disk-line'', but that the RMS variability of the continuum component should have an energy-dependent evolution associated with the time-bin-width change. Such an energy-dependent variability of the continuum component can be realized by introducing absorption components with the typical variation time scale longer than that of the continuum. In this interpretation, a significant part of the broad excess feature in 5-7keV is considered to be the result of a transparent spectral window of the warm absorbers.

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