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Can a Dusty Warm Absorber Model Reproduce the Soft X-ray Spectra of MCG-6-30-15 and Mrk 766? | | M. Sako
; S. M. Kahn
; G. Branduardi-Raymont
; J. S. Kaastra
; A. C. Brinkman
; M. J. Page
; E. Behar
; F. Paerels
; A. Kinkhabwala
; D. A. Liedahl
; J. W. den Herder
; | | Date: |
19 Dec 2001 | | Journal: | Astrophys.J. 596 (2003) 114-128 | | Subject: | astro-ph | | Affiliation: | Caltech), S. M. Kahn (Columbia), G. Branduardi-Raymont (MSSL), J. S. Kaastra, A. C. Brinkman (SRON), M. J. Page (MSSL), E. Behar, F. Paerels, A. Kinkhabwala (Columbia), D. A. Liedahl (LLNL), J. W. den Herder (SRON | | Abstract: | 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. | | Source: | arXiv, astro-ph/0112436 | | Services: | Forum | Review | PDF | Favorites | |
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