broad absorption line

broad absorption line

(BAL) quasar

See quasar.

References in periodicals archive ?
Quasars whose spectra show such broad absorption lines are known as "BAL quasars.
Previous studies had found a few examples of quasars whose broad absorption lines seemed to have disappeared between one observation and the next.
Diffuse Interstellar Bands (DIB) are broad absorption lines in the spectra of stars indicating the existence of clouds of complex, unidentified molecules in the space between the stars.
The two pairs of broad absorption lines indicate gas moving toward us at 500 and 1,300 km per second.