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New Chandra Results on Seyfert I Galaxies: Fe-K lines

Published online by Cambridge University Press:  26 May 2016

Urmila Padmanabhan  and
Tahir Yaqoob
Urmila Padmanabhan
Affiliation:
Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA
Tahir Yaqoob
Affiliation:
Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA NASA/GSFC, Code 662, Greenbelt Rd., Greenbelt, MD 20771, USA

Abstract

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We present measurements of the Fe-Kα 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 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-Kα line with an underlying broad component, possibly from a disk. In the others, an apparently narrow Fe-Kα 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.

Type
Part 8 Active Galaxies and their Nuclei
Information
Symposium - International Astronomical Union , Volume 214: High Energy Processes and Phenomena in Astrophysics , 2003 , pp. 265 - 270
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

Fabian, A. C., Iwasawa, K., Reynolds, C. S., & Young, A. J. 2000, PASP, 112, 1145 Google Scholar
Fang, T. et al. 2002, ApJ, 565, 86 Google Scholar
Kaspi, S. et al. 2002, ApJ, 554, 216 CrossRefGoogle Scholar
Lee, J. C. et al. 2002, ApJ, 570, L47 Google Scholar
Reeves, J. N. et al. 2001, A&A, 365, L134 Google Scholar
Turner, T. J. et al. 2002, ApJ, 574, L123 Google Scholar
Pounds, K. et al. 2001, ApJ, 559, 181 CrossRefGoogle Scholar
Yaqoob, T. et al. 2001a, ApJ, 546, 759 Google Scholar
Yaqoob, T. & Padmanabhan, U. 2003, in ASP Conf. Ser., Active Galactic Nuclei, from Central Engine to Host Galaxy, ed. Collin, S, Combes, F. & Shlosman, I., (San Francisco: ASP), p. 7 (astro-ph/0211349) [YP03] Google Scholar
Yaqoob, T. et al. 2001b, in Conf. Proc., X-ray Emission from Accretion onto Black Holes, Proceedings, ed. Yaqoob, T., & Krolik, J. H. (published electronically on ADS), E79 (astro-ph/0111419) Google Scholar
Yaqoob, T., Padmanabhan, U., Dotani, T., & Nandra, K. 2002, ApJ, 569, 487 Google Scholar