The dust sublimation radius as an outer envelope to the bulk of the narrow Fe Kalpha line emission in Type 1 AGN

摘要: The Fe Kalpha emission line is the most ubiquitous feature in X-ray spectra of active galactic nuclei (AGN), but origin its narrow core remains uncertain. Here, we investigate connection between sizes regions and measured dusty tori 13 local Type 1 AGN. observed K radii (R_fe) are determined from spectrally resolved widths grating spectra, dust sublimation (R_dust) either optical/near-infrared reverberation time lags or near-infrared interferometric data. This direct comparison shows, on an object-by-object basis, that radius forms outer envelope to bulk emission. R_fe matches R_dust well AGN with best constrained currently. In a significant fraction objects without clear core, similar to, smaller than optical broad region. These facts place important constraints torus geometries for our sample. Extended which solid angle fluorescing gas peaks at beyond can be ruled out. We also test luminosity scalings R_fe, finding Eddington ratio not prime driver determining location discuss detail potential caveats due data analysis instrumental limitations, simplistic modeling, uncertain black hole masses, as sample selection, showing none these likely bias result. calorimeter board Astro-H will soon vastly increase parameter space over measurements made, overcoming many limitations.