Dusty haloes of galaxies at intermediate redshifts

Details Dusty haloes of galaxies at intermediate redshifts Dusty haloes of galaxies at intermediate redshifts

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...386..865t&link_type=abstract

Astronomy and Astrophysics, v.386, p.865-868 (2002)

Astronomy and Astrophysics

Astrophysics

2

Quasars: Absorption Lines, Galaxies: Haloes, Ism: Dust

Scientific paper

The presence and amount of dust in the halo matter producing narrow metal line absorption systems is still uncertain. We consider the parameter Sigmaa = sum (1+za), summed over the detected aborption line system redshifts za, and ask whether radio-loud quasars at z < 2 and with a large value of the parameter Sigmaa are redder in the B-V colour than those with a smaller Sigmaa. 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.

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