Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9095k&link_type=abstract
HST Proposal ID #9095
Computer Science
Hst Proposal Id #9095 Agn/Quasars
Scientific paper
Photoionized, warm absorbing gas is an important component of the nuclear structure of AGN. Approximately half of all low-z AGN show high-ionization UV absorption lines and X-ray warm absorbers, but the relationship of the UV-absorbing gas to the even higher ionization X-ray absorbing material is not yet understood. Only a handful of high-spectral-resolution observations with HST, Chandra or FUSE currently exist {NGC 4151, NGC 3516, NGC 3783, NGC 5548, Mrk 509}. These show a diversity of kinematic structure and ionization states in the absorbers. We propose to increase significantly the sample of low-redshift AGN studied at high spectral resolution in the UV and the X-ray by obtaining simultaneous HST, Chandra, and FUSE spectra of NGC 7469 and Mrk 279. Both are bright AGN with O vi absorption resolved in recent FUSE observations. The new simultaneous observations will resolve the kinematics and ionization state of both the UV and X-ray absorbers. This will permit a definitive assessment of their relationship and give clues to their location in the nuclear region. Using the variety of ionization states and the multiple absorbing components, we will also reconstruct the ionizing spectrum. Understanding the absorbing gas and its influence on the radiation escaping from AGN has important implications for the radiative input to the IGM and the origins of the X-ray background.
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