Broad absorption-line time variability in the QSO CSO 203

Details Broad absorption-line time variability in the QSO CSO 203 Broad absorption-line time variability in the QSO CSO 203

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397...81b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 81-87.

Astronomy and Astrophysics

Astrophysics

48

Absorption Spectra, Astronomical Spectroscopy, Line Spectra, Quasars, Aluminum, Carbon, Nitrogen, Photoionization, Photons, Silicon

Scientific paper

We present spectroscopy of the BALQSO CSO 203 during four epochs over a 17-month time span. These data show three distinct levels in the broad absorption lines (BALs) of Si IV 1397A and C IV 1549A. We also note possible variations in the N V 1240A and Al III 1857A absorption troughs. A broad-band monitoring effort during this period shows that the continuum level remained constant to within 10 percent. We argue that the triggering mechanism for the absorption-line changes is most likely synchronous with the continuum source photons; however, no correlation with the central source has yet been found. The observed variations are consistent with changes in the ionization level in the broad absorption-line region (BALR). We discuss possible mechanisms for these changes and the implications for the structure of the BALR.

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