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Constraints on a strong X-ray flare in the Seyfert galaxy MCG–6-30-15

Published online by Cambridge University Press:  01 August 2006

R. W. Goosmann ,
B. Czerny ,
V. Karas ,
M. Dovčiak ,
G. Ponti  and
M. Mouchet
R. W. Goosmann
Affiliation:
Astronomical Institute, Academy of Sciences, Boční II 1401, 14131 Prague, Czech Republic email: goosmann@astro.cas.cz
B. Czerny
Affiliation:
Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
V. Karas
Affiliation:
Astronomical Institute, Academy of Sciences, Boční II 1401, 14131 Prague, Czech Republic email: goosmann@astro.cas.cz
M. Dovčiak
Affiliation:
Astronomical Institute, Academy of Sciences, Boční II 1401, 14131 Prague, Czech Republic email: goosmann@astro.cas.cz
G. Ponti
Affiliation:
Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, 40127, Bologna, Italy
M. Mouchet
Affiliation:
Laboratoire ApC, Université Denis Diderot, 2 place Jussieu, 75251 Paris Cedex 05, France
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Abstract

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We discuss implications of a strong flare event observed in the Seyfert galaxy MCG–6-30-15 assuming that the emission is due to localized magnetic reconnection. We conduct detailed radiative transfer modeling of the reprocessed radiation for a primary source that is elevated above the disk. The model includes relativistic effects and Keplerian motion around the black hole. We show that for such a model setup the observed time-modulation must be intrinsic to the primary source. Using a simple analytical model we then investigate time delays between hard and soft X-rays during the flare. The model considers an intrinsic delay between primary and reprocessed radiation, which measures the geometrical distance of the flare source to the reprocessing sites. The observed time delays are well reproduced if one assumes that the reprocessing happens in magnetically confined, cold clouds.

Keywords

Galaxies: active – galaxies: Seyfert – X-rays: individual (MCG–6-30-15)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 99 - 102
Copyright
Copyright © International Astronomical Union 2007

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