broad absorption line

broad absorption line

(BAL) quasar

See quasar.

References in periodicals archive ?
The width of this "broad absorption line" (BAL) measures the speed of the quasar's wind.
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.