X-ray evidence for a mildly relativistic and variable outflow in the luminous Seyfert 1 galaxy Mrk 509M. Cappi1, F. Tombesi1, 2, 3, 4, S. Bianchi5, M. Dadina1, M. Giustini1, 2, 6, G. Malaguti1, L. Maraschi7, G. G. C. Palumbo2, P. O. Petrucci8, G. Ponti9, C. Vignali2, and T. Yaqoob3, 4
1 INAF-IASF Bologna, via Gobetti 101, 40129 Bologna, Italy
2 Dipartimento di Astronomia, Università degli Studi di Bologna, via Ranzani 1, 40127 Bologna, Italy
3 Department of Physics and Astronomy, Johns Hopkins University, 3400, Baltimore, MD 21218, USA
4 Laboratory for High Energy Astrophysics, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
5 Dipartimento di Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146, Roma, Italy
6 Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
7 INAF - Osservatorio Astronomica di Brera, via Brera 28, 20121, Milano, Italy
8 Laboratoire d'Astrophysique de Grenoble, Université Joseph-Fourier/CNRS UMR 5571, 38041 Grenoble, France
9 APC Université Paris 7 Denis Diderot, 75205 Paris, France
Received 23 March 2009 / Accepted 8 June 2009
Context. There is growing evidence for the presence of blueshifted Fe K absorption lines in a number of radio-quiet AGNs and QSOs. These may be fundamental to probe flow dynamics near supermassive black holes.
Aims. Here we aim to verify and better characterise the existence of such Fe K absorption at ~8–10 keV in the luminous Seyfert 1 galaxy Mrk 509, one of the most promising target for these studies.
Methods. We present a comprehensive spectral analysis of the six XMM-Newton observations of the source (for a total of ~200 ks), focusing on a detailed and systematic search for absorption features in the high-energy data.
Results. We detect several absorption features at rest-frame energies ~8–8.5 keV and ~9.7 keV. The lines are consistent with being produced by H-like iron K and K shell absorptions associated with an outflow with a mildly relativistic velocity of ~0.14–0.2 c. The lines are found to be variable in energy and, marginally, in intensity, implying variations in either the column density, geometry and/or ionization structure of the outflow are common.
Key words: galaxies: active -- X-rays: galaxies -- accretion, accretion disks -- thechniques: spectroscopic -- line: formation -- galaxies: Seyfert
© ESO 2009