Computer Science
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010fym..confp..41n&link_type=abstract
"The First Year of MAXI: Monitoring Variable X-ray Sources", Poster Presentations, 4th International MAXI Workshop held November
Computer Science
Scientific paper
In order to assess the reality of the extreme Kerr black-hole interpretation of MCG-6-30-15 by Miniutti et al. (2007), we re-analyzed the Suzaku XIS and HXD data of this Seyfert galaxy obtained in January 2006. Through intensity-sorted spectroscopy, we discovered a very hard component that varies independently of the dominant power-law emission. This new component, dominant in the 10-30 keV range, can be modeled in several different ways; e.g., a thermal Comptonization emission with a large optical depth, or a partially-absorbed power-law with a photon index of 2. When this component is included in the fitting model, the time-averaged 2.5-55 keV spectrum of MCG-6-30-15 can be reproduced successfully by invoking a moderate reflection coming approximately from a flat plane. At the same time, the best-fit iron-line broadening reduces to a level where the emission region is located at > 8 Rg from the central black hole. Therefore, the super-massive black hole in MCG-6-30-15 is not required to be in the extreme Kerr condition.
Makishima Kazuo.
Nakazawa Kazuhiro
Noda Hirotomo
Yamada Shoichi
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