The CFHTLS-Strong Lensing Legacy Survey (SL2S): Investigating the group-scale lenses with the SARCS sample

7th International Conference on Gravitation and Cosmology

More, A.^1,2 ; Cabanac, R.^3,4 ; More, S.^1 ; Alard, C.^5 ; Limousin, M.^2 ; Kneib, J.-P.^2 ; Gavazzi, R.^5 ; Motta, V.^6

Kavli Institute for Cosmological Physics, University of Chicago, 5640 S. Ellis Ave., Chicago IL-60637, United States^1

Laboratoire d'Astrophysique de Marseille, 38 rue Frederic Joddress, 13013 Marseille, France^2

Université de Toulouse, UPS-OMP, IRAP, Tarbes, France^3

CNRS, IRAP, 57, Ave. d'Azereix, 65000 Tarbes, France^4

Institute d'Astrophysique de Paris, France^5

Universidad de Valparaiso, Departamento de Fisica y Astronomia, Avenida Gran Bretana 1111, Valparaiso, Chile^6

关键词: Baryonic component;    Changing parameter;    Finding algorithm;    Image separation;    Luminosity functions;    Mass-luminosity relation;    Non-overlapping areas;    Semiautomatic methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/484/1/012041/pdf
DOI  :  10.1088/1742-6596/484/1/012041

来源: IOP

【 摘 要 】

We have presented the Strong Lensing Legacy Survey-ARCS (SARCS) sample compiled from the T0006 data release of the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) covering a total non-overlapping area of 159 deg2. We have adopted a semi-automatic method to find gravitational arcs in the survey that makes use of an arc-finding algorithm. The SARCS sample consists of 127 lens candidates, out of which, 54 systems are promising lenses. From our sample, we have detected a systematic alignment of the giant arcs with the major axis of the baryonic component of the putative lens in concordance with previous studies. This alignment is also observed for all arcs in the sample and does not vary significantly with increasing arc radius. Owing to the large area and depth of the CFHTLS, we have found the largest sample of lenses probing mass scales that are intermediate to cluster and galaxy lenses for the first time. We have compared the observed image separation distribution (ISD) of our arcs with theoretical models. A two-component density profile for the lenses, which accounts for both the central galaxy and the dark matter component is required by the data to explain the observed ISD. Unfortunately, current levels of uncertainties and degeneracies accommodate models both with and without adiabatic contraction. We have also shown the effects of changing parameters of the model that predict the ISD and that a larger lens sample might constrain relations such as the concentration-mass relation, mass-luminosity relation and the faint-end slope of the luminosity function.