Long XMM observation of the Narrow-Line Seyfert 1 galaxy IRAS13224-3809: rapid variability, high spin and a soft lag
| Autor: | Fabian, A. C., Kara, E., Walton, D. J., Wilkins, D. R., Ross, R. R., Lozanov, K., Uttley, P., Gallo, L. C., Zoghbi, A., Miniutti, G., Boller, T., Brandt, W. N., Cackett, E. M., Chiang, C. -Y., Dwelly, T., Malzac, J., Miller, J. M., Nardini, E., Ponti, G., Reis, R. C., Reynolds, C. S., Steiner, J., Tanaka, Y., Young, A. J. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/sts504 |
| Popis: | Results are presented from a 500ks long XMM-Newton observation of the Narrow-Line Seyfert 1 galaxy IRAS13224-3809. The source is rapidly variable on timescales down to a few 100s. 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 0.988 with a statistical precision better than one per cent. Systematic uncertainties are discussed. A soft X-ray lag of 100s confirms this scenario. The bulk of the power-law continuum source is located at a radius of 2-3 gravitational radii. Comment: 7 pages, 14 figures, submitted to MNRAS |
| Databáze: | arXiv |
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