High Velocity Outflows in AGNs Observed with Gratings |
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Authors: | Shai Kaspi Ehud Behar |
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Institution: | 1. Physics Department, Technion, Haifa, 32000, Israel
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Abstract: | Several Active Galactic Nuclei (AGNs) have been reported to harbor fast outflows exceeding 10,000 km?s?1, which are detected mostly in their low-resolution CCD X-ray spectra. Only few, however, were detected with high-resolution grating spectrometers. Most of the grating detected outflows have been observed multiple times. In these cases, the absorption spectrum changes are indicating that variability is common among these high-velocity winds. In this paper we revisit the grating observations of PG?1211+143, and PDS?456, and report preliminary results on 4C?74.26. We discuss the spectral variability of the first two sources and its implications to the outflows. |
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