2002/11/17 by U. Padmanabhan, Padmanabhan, U., T. Yaqoob +1
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0211386
6 pages, 2 figures, 1 table, In Conference Proceedings,``High Energy Processes and Phenomena in Astrophysics'' (IAU Symp. 214), Suzhou, China, 2002
arxiv created 2002/11/17 · arxiv updated 2009/12/01
We present measurements of the Fe-K line for nine Seyfert I galaxies using Chandra High Energy Transmission Grating Spectrometer (HETGS) data. The centroid energies are narrowly dispersed (6.403 +/- 0.062 keV) and indicate an origin of the line cores in cold matter. If \it all the lines in this sample were the peaks of a relativistically broadened disk line, it would require unrealistically fine tuning. However, at least three of the nine AGN clearly show a complex Fe-K line with an underlying broad component, possibly from a disk. In the others, an apparently narrow Fe-K line (even if it is resolved by Chandra) may still be due to the peak of a disk line. To distinguish this scenario from an origin in distant matter requires variability information.