Tu, H. and Gavazzi, R. and Limousin, M. and Cabanac, R. and Marshall, P. J. and Fort, B. and Treu, T. and Péllo, R. and Jullo, E. and Kneib, J.-P. and Sygnet, J.-F. (2009) The mass profile of early-type galaxies in overdense environments: the case of the double source-plane gravitational lens SL2SJ02176-0513. Astronomy and Astrophysics, 501 (2). pp. 475-484. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20110317-160520052
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Context. 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. Aims. 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. Methods. SL2SJ02176-0513 is a remarkable lens for the presence of two multiply-imaged systems at different redshifts lensed by a foreground massive galaxy at Z_(lens) = 0.656: a bright cusp arc at z_(arc) = 1.847 and an additional double-image system at an estimated redshift of z_(dbl) ~ 2.9 based on photometry and lensing geometry. The system is located about 400 kpc 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. Results. 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 f_(dm)(<R_c) = 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 ; (σ_(grp) = 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. Conclusions. We demonstrate that multiple source plane systems together with good ancillary dataset can be used to disentangle local and environmental effects.
|Additional Information:||© 2009 ESO. Received 27 February 2009, Accepted 13 April 2009, Published online 19 May 2009. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS. This paper is based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with programs #10876 and #11289. Support for programs #10876 and #11289 was provided by NASA through a grant from the Space Telescope Science Institute. The authors are thankful to the CFHTLS members and the Terapix team for their excellent work in reducing and distributing data to the community. We thank Matthew Auger for insightful conversations. Part of this project is done under the support of National Natural Science Foundation of China Nos. 10878003, 10778752, 973Program No. 2007CB815402, Shanghai Foundation Nos. 08240514100, 07dz22020, and the Leading Academic Discipline Project of Shanghai Normal University (08DZL805). Part of this work was supported by the Agence Nationale de la Recherche (ANR) and the Centre National des Études Spatiales (CNES). M.L. acknowledges the ANR and CNES for its support. The Dark Cosmology centre is funded by the Danish National Reasearch Fundation. P.J.M. acknowledges the TABASGO foundation for support in the form of a research fellowship. T.T. acknowledges support from the National Science Foundation through CAREER award NSF-0642621, by the Sloan Foundation through a Sloan Research Fellowship, and by the Packard Foundation through a Packard Fellowship.|
|Subject Keywords:||gravitational lensing – Galaxy: general – dark matter|
|Official Citation:||The mass profile of early-type galaxies in overdense environments: the case of the double source-plane gravitational lens SL2SJ02176-0513 H. Tu, R. Gavazzi, M. Limousin, R. Cabanac, P. J. Marshall, B. Fort, T. Treu, R. Péllo, E. Jullo, J.-P. Kneib and J.-F. Sygnet A&A 501 (2) 475-484 (2009) DOI: 10.1051/0004-6361/200911963|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||18 Mar 2011 17:40|
|Last Modified:||26 Dec 2012 13:05|
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