BAL quasar

BAL quasar

short for broad absorption line quasar. See quasar.
References in periodicals archive ?
Spectroscopic observations map the Mrk 509 warm absorber, study the mini-broad absorption line quasar PG 1126-041, determine the source of reddening in low ionization BAL quasars, and probe quasar winds using narrow intrinsic absorption lines.
Quasars whose spectra show such broad absorption lines are known as "BAL quasars."
Over the past three years, as part of SDSS-III's Baryon Oscillation Spectroscopic Survey (BOSS), the researchers specifically have been seeking out repeated spectra of BAL quasars through a program proposed by Brandt and his colleagues.
Over the past three years, as part of SDSS-III's Baryon Oscillation Spectroscopic Survey (BOSS), the survey has been specifically seeking out repeated spectra of BAL quasars through a program proposed by Brandt and colleagues.
Their persistence paid off-the research team gathered a sample of 582 BAL quasars, each of which had repeat observations over a period of between one and nine years-a sample about 20 times larger than any that had been previously assembled.