A Snapshot Survey of Variability of Narrow and Broad Associated Absorption Lines in Quasars

Details A Snapshot Survey of Variability of Narrow and Broad Associated Absorption Lines in Quasars A Snapshot Survey of Variability of Narrow and Broad Associated Absorption Lines in Quasars

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8681c&link_type=abstract

HST Proposal ID #8681

Physics

Hst Proposal Id #8681 Agn/Quasars

Scientific paper

Variability in the strength of absorption lines in quasar spectra is definitive proof that we are observing material that is physically associated with the quasars. We propose to conduct a STIS snapshot survey to provide second epoch observations of 37 quasars with narrow associated {Delta v<5000 kms} or broad absorption lines {NALs and BALs}, previously observed with the FOS. At high redshift several intrinsic NALs and about two thirds of BALs are known to vary, often in accord with continuum variability. The amplitudes increase and the timescales decrease with decreasing quasar luminosity. The low-redshift sample of quasars in the FOS archive includes a larger fraction of nearby low-luminosity quasars. Thus it may show more extreme variability in intrinsic absorption lines than the high redshift sample. The present study will provide: {1} an estimate of the fraction of quasars that have intrinsic NALs, {2} a lower limit on the fraction of intrinsic NALs and of BALs that are variable and {3} an indication of the relationships between continuum, emission line, and absorption line variability in various chemical species. More importantly, this snapshot survey will produce a database of variable low-z NALs and BALs for studies at higher temporal and spectral resolution. Well resolved time variability and partial coverage analysis of multiple chemical transitions in these quasars may well provide the most detailed views yet of outflows from the central engines.

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