X-ray narrow line region variability as a geometry probe: The case of NGC 5548

Details X-ray narrow line region variability as a geometry probe: The case of NGC 5548 X-ray narrow line region variability as a geometry probe: The case of NGC 5548

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hrxs.confe..14d&link_type=abstract

"High Resolution X-ray Spectroscopy: Towards IXO, Proceedings of the international workshop held at the Mullard Space Science La

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Scientific paper

We study the long time scale variability of the gas responsible for the narrow emission lines in the Seyfert 1 galaxy NGC 5548, in order to constrain the location and geometry of the emitting gas. Using X-ray spectra taken with Chandra LETGS and XMM Newton RGS and combining them with long-term monitoring observations of RXTE, we determine the time scale on which the narrow line emitting gas responds to variations of the continuum flux. This, along with the observed parameters of the O VII forbidden emission line allows us to constrain the location and geometry of the X-ray NLR gas. We conclude that the NLR in NGC 5548 is in the form of an ionization cone, very compact in size, and located between 1 and 5 pc from the central source. We also expand our study to other well-observed Type 1 AGN to determine the geometry and location in those sources.

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