Long XMM observation of the narrow-line Seyfert 1 galaxy IRAS 13224-3809: Rapid variability, high spin and a soft lag

A. C. Fabian, E. Kara, D. J. Walton, D. R. Wilkins, R. R. Ross, K. Lozanov, P. Uttley, L. C. Gallo, A. Zoghbi, G. Miniutti, T. Boller, W. N. Brandt, E. M. Cackett, C. Y. Chiang, T. Dwelly, J. Malzac, J. M. Miller, E. Nardini, G. Ponti, R. C. ReisC. S. Reynolds, J. F. Steiner, Y. Tanaka, A. J. Young

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Abstract

The narrow-line Seyfert 1 galaxy IRAS 13224-3809 has been observed withXMM-Newton for 500 ks. The source is rapidly variable on time-scales down to a few 100 s. The spectrum shows strong broad Fe - K and L emission features which are interpreted as arising from reflection from the inner parts of an accretion disc around a rapidly spinning black hole. Assuming a power law emissivity for the reflected flux and that the innermost radius corresponds to the innermost stable circular orbit, the black hole spin is measured to be 0.989 with a statistical precision better than 1 per cent. Systematic uncertainties are discussed. A soft X-ray lag of 100 s confirms this scenario. The bulk of the power-law continuum source is located at a radius of 2-3 gravitational radii.

Original languageEnglish (US)
Pages (from-to)2917-2923
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume429
Issue number4
DOIs
StatePublished - Mar 11 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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