Computer Science
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe..39n&link_type=abstract
Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.
Computer Science
Active Galaxies And Quasars
Scientific paper
We use new Chandra observations and several ASCA observations of NGC 3516 to investigate the spectral variations in this source over a period of 7 years. A comparison of the Chandra observations, when the source was almost at an all-time minimum, and the ASCA 1994 observations, close to the all-time maximum, indicates that the very large change (factor ~20 at 1 keV) in flux is entirely consistent with a change in ionizing flux seen through a constant column warm-absorber. Intermidiate cases are all fitted by the very same model including an episode of a factor ~2 flux drop over 60 ks. Our very detailed model allows us to put a strong upper limit on the density of the recombining gas and hence, together with the model parameters, the location of the warm absorber. We find that n > 106 cm-3 which is the best limit obtained so far on the conditions in the WA gas in AGN. It suggests a location outside but close to the BLR and a thin shell geometry. The analysis of the LETG data shows also a narrow 6.4 keV iron line probably originating in a cold torus.
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