Long XMM observation of the narrow-line Seyfert 1 galaxy IRAS 13224−3809: rapid variability, high spin and a soft lag
Year: 2013
Type: article
Abstract: 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 gravitational radii.
DOI: 10.1093/mnras/sts504
Authors: 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. Reis, C. S. Reynolds, J. F. Steiner, Y. Tanaka, A. J. Young
Institutions: University of Cambridge, College of the Holy Cross, University of Amsterdam, Saint Mary's University, University of Maryland, College Park, Consejo Superior de Investigaciones Científicas, Centro de Astrobiología, Max Planck Institute for Extraterrestrial Physics, Pennsylvania State University, Wayne State University, University of Southampton, University of Michigan, Center for Astrophysics Harvard & Smithsonian, University of Bristol
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2019778446