Time variability of the warm outflow in NGC 5548

Details Time variability of the warm outflow in NGC 5548 Time variability of the warm outflow in NGC 5548

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1730m&link_type=abstract

Chandra Proposal ID #06700021

Computer Science

Chandra Proposal Id #06700021

Scientific paper

We propose to observe the Seyfert 1 galaxy NGC 5548 for 147 ks with the LETGS in order to obtain a high-resolution X-ray spectrum. NGC 5548 has been observed earlier with the LETGS on two different occasions. A comparison of both spectra shows that a significant change in the warm absorber occurred in the K-shell absorption line of O V, the most lowly ionized oxygen ion with a well measured absorption line. A recent HST observation shows significant changes in the column density of the different velocity components of C IV. With our new observation we will study further the long term variability of the outflow, by comparing the X-ray spectrum with the two earlier LETGS spectra as well as archival HETGS and XMM-Newton RGS spectra.

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