Variability of the broad absorption lines in the QSO UM 232

Details Variability of the broad absorption lines in the QSO UM 232 Variability of the broad absorption lines in the QSO UM 232

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..674b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 674-678.

Astronomy and Astrophysics

Astrophysics

19

Absorption Spectra, Quasars, Spectral Line Width, Optical Thickness, Variability

Scientific paper

Low-resolution spectra of UM 232 taken in 1978, 1979, and 1988 at Lick Observatory are presented. Large changes in the Si IV lambda 1397, CIV lambda 1549, and Al III lambda 1857 broad absorption lines are apparent. The decrease in column density in all three ions and an observed brightening of the QSO suggests that these changes are due to an increase in the ionization level driven by an increase in the central source luminosity. This mechanism has been proposed by Smith and Penston to explain small changes in the absorption spectrum of the QSO 1246-057. The spectra of UM 232 show that the fractional decrease in optical depth is smaller at higher outflow velocies. The structure of the broad absorption-line region (BALR) is investigted by estimating an ionization parameter for each ion species as a function of velocity.

Affiliated with

Also associated with

No associations

Rating

Variability of the broad absorption lines in the QSO UM 232 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Variability of the broad absorption lines in the QSO UM 232, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variability of the broad absorption lines in the QSO UM 232 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1566988