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Iron Kalpha emission from the low-luminosity Active Galaxies M81 and NGC 4579 | | G. C. Dewangan
; R. E. Griffiths
; T. Di Matteo
; N. J. Schurch
; | | Date: |
13 Feb 2004 | | Journal: | Astrophys.J. 607 (2004) 788-793 | | Subject: | astro-ph | | Affiliation: | CMU), R. E. Griffiths (CMU), T. Di Matteo (MPA), and N. J. Schurch (CMU | | Abstract: | We report on XMM-Newton spectroscopy of the low-luminosity active galaxies (LLAGN) M81 and NGC4579 both of which have known black hole masses and well-sampled spectral energy distributions (SED). The iron Kalpha line profiles from both the LLAGN can be described in terms of two components - a narrow line at 6.4 keV and a moderately broad line (FWHM = 20000 km/s) arising from highly ionized, He-like or H-like species (E sim 6.8 keV). We interpret the broad lines arising from an accretion disk the inner edge of which is restricted to large radii (r_{in} sim 100 r_g). However, the Eddington ratio, {L}/{L_{Edd}}, of these sources, is 3 - 4 orders of magnitude lower than that required to photo-ionize a cold disk to He-like iron. We suggest that the lines can be explained as collisionally ionized X-ray lines arising from the transition region between a hot (radiatively inefficient) flow in the inner regions and a cold disk outside r sim 100r_g. The accretion flow geometry probed by our XMM-Newton observations is consistent with the truncated disk models proposed to explain the SED of LLAGNs. | | Source: | arXiv, astro-ph/0402327 | | Services: | Forum | Review | PDF | Favorites | |
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