2000A&A...363..837L


Query : 2000A&A...363..837L

2000A&A...363..837L - Astronomy and Astrophysics, volume 363, 837-842 (2000/11-3)

Lensing properties of 7 damped Lyα absorbing galaxy-QSO pairs.

LE BRUN V., SMETTE A., SURDEJ J. and CLAESKENS J.-F.

Abstract (from CDS):

Le Brun et al. (1997A&A...321..733L) presented the first identifications of the galaxies giving rise to 7 intermediate redshift damped Lyα (DLA) absorption systems. Here, we study the gravitational lensing properties of these foreground galaxies based on their observed optical appearance and on the absence of any secondary lensed quasar image. We consider the possibility that any secondary image be hidden due to extinction by dust, but find it unlikely. We derive upper limits on the amplification factor affecting the luminosity of the background quasars; in each case, this factor is found to be less than 0.3mag. We also obtain upper limits on the total mass of the damped Ly-α galaxies, within radii equal to the quasar impact parameters. Mass-to-light ratios are found to be consistent with existing estimates based on X-ray emission or on motion of dwarf satellites. Although we show that lensing is not important in this sample, we note that existing DLA surveys used to determine the cosmological density of gas at z<1 are based on samples of quasars brighter than the ones considered here and for which the amplification bias is likely to be stronger.

Abstract Copyright:

Journal keyword(s): galaxies: quasars: absorption lines - galaxies: halos - galaxies: ISM

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 QSO J0304-2211 QSO 03 04 49.8652311288 -22 11 51.882127548   16.43 16.40     ~ 107 0
2 QSO B0454+0356 QSO 04 56 47.1747907776 +04 00 52.946102484   16.76 16.53 16.26   ~ 234 1
3 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 512 2
4 LBQS 1209+1046 QSO 12 11 40.6043132184 +10 30 02.074373208   18.52 18.37     ~ 111 0
5 4C -02.55 QSO 12 32 00.0159535440 -02 24 04.793069304   17.41 17.06 16.4   ~ 401 1
6 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4065 2
7 QSO B1331+170 QSO 13 33 35.7827544072 +16 49 04.013500728   16.84 16.71 16.41   ~ 426 0

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2022.05.29-04:25:37

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