Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9511k&link_type=abstract
HST Proposal ID #9511
Computer Science
Hst Proposal Id #9511
Scientific paper
In the last Chandra cycle, we were awarded a joint Chandra/HST proposal to study the warm absorber in NGC 5548 and to obtain a definitive answer about the connection between the warm absorber and the UV absorber in this object. We are confident that the deep Chandra observation {500 ksec} will allow for an unprecedented determination of the kinematic components in the warm absorber as well as accurate column density measurements from several line series. However, two new lines of investigation that appeared after the submission of the Chandra/HST proposal, suggest that the original modest request for HST time will not suffice to obtain reliable column density measurements for the UV absorber. In view of the new evidence, we need a a higher S/N in the proposed observations to allow for accurate UV column densities determination. Absorption features in both the UV and warm absorbers are known to be variable. Therefore, it will be highly unfortunate if the large investment of Chandra time will not be accompanied by enough simultaneous HST time to ensure an accurate measurements of the UV absorber. Without these it will be very difficult to draw conclusions concerning the relationship between the two absorbers. We therefore ask for 20 additional STIS E140M Echelle orbits.
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