2009A&A...501..475T


Query : 2009A&A...501..475T

2009A&A...501..475T - Astronomy and Astrophysics, volume 501, 475-484 (2009/7-2)

The mass profile of early-type galaxies in overdense environments: the case of the double source-plane gravitational lens SL2SJ02176-0513.

TU H., GAVAZZI R., LIMOUSIN M., CABANAC R., MARSHALL P.J., FORT B., TREU T., PELLO R., JULLO E., KNEIB J.-P. and SYGNET J.-F.

Abstract (from CDS):

The Strong Lensing Legacy Survey (SL2S) provides a sample of the strong lensing events associated with massive distant galaxies, some of which lie in the outskirts of galaxy groups and clusters. We investigate the internal structure of early-type galaxies in overdense environments, where tidal forces are expected to alter dark matter haloes of infalling galaxies. SL2SJ02176-0513 is a remarkable lens for the presence of two multiply-imaged systems at different redshifts lensed by a foreground massive galaxy at zlens=0.656: a bright cusp arc at zarc=1.847 and an additional double-image system at an estimated redshift of zdbl∼2.9 based on photometry and lensing geometry. The system is located about 400kpc away from the centre of a massive group of galaxies. Mass estimates for the group are available from X-ray observations and satellite kinematics. Multicolour photometry provides an estimate of the stellar mass of the main lens galaxy. The lensing galaxy is modelled with two components (stars and dark matter), and we include the perturbing effect of the group environment and all available constraints. We find that classic lensing degeneracies, e.g. between external convergence and mass density slope, are significantly reduced with respect to standard systems and infer tight constraints on the mass density profile: (i) the dark matter content of the main lens galaxy is in line with that of typical galaxies fdm(<Re)=0.41+0.09–0.06; (ii) the required mass associated with the dark matter halo of the nearby group is consistent with X-ray (σgrp=550+130–240); (iii) accounting for the group contribution in the form of an external convergence, the slope of the mass density profile of the main lens galaxy alone is found to be α=-1.03+0.22–0.16, consistent with the isothermal (α=-1) slope. We demonstrate that multiple source plane systems together with good ancillary dataset can be used to disentangle local and environmental effects.

Abstract Copyright:

Journal keyword(s): gravitational lensing - Galaxy: general - dark matter

CDS comments: In ref list, Geach 2007 MNRAS 873 is a misprint for Geach 2007MNRAS.381.1369G

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 CANDELS UDS F160W J021737.14-051329.5 rG 02 17 37.14752 -05 13 29.5242   23.372 22.054 21.102 19.12 ~ 42 0
2 SDSS J094656.68+100652.8 G 09 46 56.6809160256 +10 06 52.903093212     17.78   17.09 ~ 31 0
3 8C 0958+561 QSO 10 01 20.6918953728 +55 53 55.593949272   17.16 16.95     ~ 720 3
4 QSO B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 667 2

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2023.02.09-09:53:22

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