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Can a Dusty Warm Absorber Model Reproduce the Soft X‐Ray Spectra of MCG −6‐30‐15 and Markarian 766?

M. ŠakoCurrent address: Theoretical Astrophysics and Space Radiation Laboratory, California Institute of Technology, MC 130-33, Pasadena, CA 91125S. M. KahnColumbia Astrophysics Laboratory, 550 West 120th Street, New York, NY 10027G. Branduardi‐RaymontMullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking Surrey RH5 6NT, UKJ. S. KaastraSRON, the National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The NetherlandsAlbert C. BrinkmanSRON, the National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The NetherlandsMathew PageMullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking Surrey RH5 6NT, UKEhud BeharColumbia Astrophysics Laboratory, 550 West 120th Street, New York, NY 10027F. PaerelsColumbia Astrophysics Laboratory, 550 West 120th Street, New York, NY 10027Ali KinkhabwalaColumbia Astrophysics Laboratory, 550 West 120th Street, New York, NY 10027D. A. LiedahlPhysics Department, Lawrence Livermore National Laboratory, P.O. Box 808, L-41, Livermore, CA 94550J. W. den HerderSRON, the National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands

2003en

ABI

Аннотация

XMM-Newton RGS spectra of MCG-6-30-15 and Mrk 766 exhibit complex discrete structure, which was interpreted in a paper by Branduardi-Raymont et al. (2001) as evidence for the existence of relativistically broadened Lyman alpha emission from carbon, nitrogen, and oxygen, produced in the inner-most regions of an accretion disk around a Kerr black hole. This suggestion was subsequently criticized in a paper by Lee et al. (2001), who argued that for MCG-6-30-15, the Chandra HETG spectrum, which is partially overlapping the RGS in spectral coverage, is adequately fit by a dusty warm absorber model, with no relativistic line emission. We present a reanalysis of the original RGS data sets in terms of the Lee et al. (2001) model, and demonstrate that spectral models consisting of a smooth continuum with ionized and dust absorption alone cannot reproduce the RGS spectra of both objects. The original relativistic line model with warm absorption proposed by Branduardi-Raymont et al. (2001) provides a superior fit to the RGS data, both in the overall shape of the spectrum and in the discrete absorption lines. Limits on the amount of X-ray absorption by dust particles are discussed. We also discuss a possible theoretical interpretation for the putative relativistic Lyman alpha line emission in terms of the photoionized surface layers of the inner regions of an accretion disk.

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DOI: 10.1086/377575

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