Monitoring the changing wind of a Seyfert galaxy

Details Monitoring the changing wind of a Seyfert galaxy Monitoring the changing wind of a Seyfert galaxy

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2190m&link_type=abstract

Chandra Proposal ID #08700026

Computer Science

Chandra Proposal Id #08700026

Scientific paper

The bright Seyfert galaxy NGC 5548 has been observed with Chandra and XMM-Newton during the period 1999-2002. A recent observation in 2005 caught the source during a long period of low flux. The spectrum shows for the first time a significant drop of the narrow forbidden O VII emission line, as well as new lowly ionized components in the warm absorber. We propose to re-observe NGC 5548 with the LETGS for 140 ks. If the source remains in a low state, limits on any further decrease in ionization will be derived, and the spectrum combined with the 2005 spectrum allows for a more accurate study of the low state absorber. If NGC 5548 is in a normal state again, we will see wheter the forbidden O VII emission line has increased again or not, and whether the lowly ionized components disappeared.

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