Soft X-ray emission lines from a relativistic accretion disk in MCG-6-30-15 and Mrk 766 *
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK
2 Department of Physics and Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA
3 Space Research Organisation of The Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
Accepted: 6 November 2000
XMM-Newton Reflection Grating Spectrometer (RGS) spectra of the Narrow Line Seyfert 1 galaxies MCG-6-30-15 and Mrk 766 are physically and spectroscopically inconsistent with standard models comprising a power-law continuum absorbed by either cold or ionized matter. We propose that the remarkably similar features detected in both objects in the 5-35 Åband are H-like oxygen, nitrogen, and carbon emission lines, gravitationally redshifted and broadened by relativistic effects in the vicinity of a Kerr black hole. We discuss the implications of our interpretation, and demonstrate that the derived parameters can be physically self-consistent.
Key words: black hole physics / accretion, accretion disks / line: formation / galaxies: individual: MCG-6-30-15 / galaxies: individual: Mrk 766 / X-rays: galaxies
© ESO, 2001