AALs in Quasars: Diagnostics of the Environment

Details AALs in Quasars: Diagnostics of the Environment AALs in Quasars: Diagnostics of the Environment

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9871s&link_type=abstract

HST Proposal ID #9871

Physics

Hst Proposal Id #9871 Agn/Quasars

Scientific paper

Associated absorption lines {AALs} in quasar spectra carry a wealth of information on the gas-phase kinematics, ionization states, column densities, outflow masses, and elemental abundances near the quasars. Most of the existing UV spectra have low spectral resolution, which hampers efforts to accurately determine these properties at low redshifts. We propose medium-resolution FUV and NUV STIS spectroscopy, more than an order of magnitude improvement in spectral resolution over previous studies, to observe a sample of AAL quasars at redshifts and luminosities intermediate between the nearby Seyferts and the bright, high-z quasars. Our aim is to determine basic physical parameters for the absorbers, measure the abundances, search for AAL variability, and constrain the location of the absorbers relative to the central quasars. A unique aspect of our z 0.2 sample is the ability to get both UV and X-ray diagnostics, thus allowing us to perform a joint analysis of our STIS data with X-ray observations to further constrain the full range of ionizations and column densities of the UV/X-ray absorbing gas.

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