Determining the Nature of the Variable Absorption in AGN: Monitoring NGC 3783 with HST and Chandra

Details Determining the Nature of the Variable Absorption in AGN: Monitoring NGC 3783 with HST and Chandra Determining the Nature of the Variable Absorption in AGN: Monitoring NGC 3783 with HST and Chandra

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8606c&link_type=abstract

HST Proposal ID #8606

Physics

Hst Proposal Id #8606 Agn/Quasars

Scientific paper

About 60% of Seyfert 1 galaxies show intrinsic UV absorption lines, characterized by high ionization {C IV, N V}, moderate widths {30 - 300 km s^-1}, significant outflow velocities {up to 2500 km s^-1}, and variability on time scales as small as days. Seyferts with UV absorption also show variable X-ray ``warm absorbers'', characterized by O VII and O VIII absorption edges, which suggests a common origin. Variability monitoring is the key to understanding the absorbers, by providing their radial locations, densities, and evolution in ionization, column density, velocity, and coverage of the inner active nucleus. HST/STIS and Chandra are ideal instruments for this pursuit, and NGC 3783 is an ideal target, because it shows extremely variable absorption and rapid continuum variability in both the UV and X-rays.

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