Long XMM observation of the narrow-line Seyfert 1 galaxy IRAS 13224-3809: rapid variability, high spin and a soft lag
- 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.F.
- Tanaka, Y.
- Young, A.J.
DOIAbstract
The narrow-line Seyfert 1 galaxy IRAS 13224−3809 has been observed with XMM-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...
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