Issue |
A&A
Volume 386, Number 3, May II 2002
|
|
---|---|---|
Page(s) | 865 - 868 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20020321 | |
Published online | 15 May 2002 |
Dusty haloes of galaxies at intermediate redshifts
Tuorla Observatory, 21500 Piikkiö, Finland
Corresponding author: pekkatee@astro.utu.fi
Received:
10
January
2002
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
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