Variable Broad Absorption-Lines in the QSO H 0846+1540

Details Variable Broad Absorption-Lines in the QSO H 0846+1540 Variable Broad Absorption-Lines in the QSO H 0846+1540

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1106b&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #11.06; Bulletin of the American Astronomical Society, Vol. 24, p.1135

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We present spectroscopy of the QSO H 0846+1540 (zem =~ 2.91, V =~ 18.1) over a three year period. These data show significant decreases in two broad absorption-lines (BALs) at moderate and high outflow velocities (9,000 and 26,000 km/sec). The strongest changes are evident in the CIV lambda 1549 lines, but some indication of change is also present in the high outflow velocity NV lambda 1240 BAL. The large decreases in the originally weak BALs in this object, tend to change its appearance from that of a marginal BALQSO to a non-BALQSO. An apparently coincident increase in the continuum level of about 20% accompanies the decrease in absorption strength. The data also show a decrease in the equivalent widths of the CIV, SiIV/OIV] lambda 1400, and NV emission lines. This decrease in emission line equivalent widths is consistent with the observed continuum level increase, if we assume a constant emission line flux. This is the third QSO found to show large BAL changes as part of a four year project of both spectroscopic and broadband imaging observations aimed at identifying time variable BALs in QSOs. The other two QSOs are UM232 (Ap.J. 347,674) and CSO203 (Ap.J. 397,81). About 20 BALQSOs have been monitored spectroscopically and about 60 with broadband imaging. Since BAL changes can occur without any significant (<10%) continuum level change, our study shows that about 15% (3/20) of BALQSOs readily show large broad absorption-line variability when monitored spectroscopically over a few year time scale. This work has been supported by NASA NAS 5-29293 and NAG 5-1630.

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