Dusty haloes of galaxies at intermediate redshifts
Tuorla Observatory, 21500 Piikkiö, Finland
Corresponding author: email@example.com
Accepted: 20 February 2002
The presence and amount of dust in the halo matter producing narrow metal line absorption systems is still uncertain. We consider the parameter , summed over the detected aborption line system redshifts za, and ask whether radio-loud quasars at and with a large value of the parameter are redder in the colour than those with a smaller . This is anticipated if the absorption lines originate in sites which contain “normal” dust causing selective extinction. The answer is positive, and a mean intrinsic reddening e0 per halo is consistent with ≈0.05, or about 0.2 B-mag extinction, roughly as expected.
Key words: quasars: absorption lines / galaxies: haloes / ISM: dust
© ESO, 2002