Combining strong lensing and dynamics in galaxy clusters: integrating MAMPOSSt within LENSTOOL. I. Application on SL2S J02140-0535
Abstract
Context. The mass distribution in galaxy clusters and groups is an important cosmological probe. It has become clear in recent years that mass profiles are best recovered when combining complementary probes of the gravitational potential. Strong lensing (SL) is very accurate in the inner regions, but other probes are required to constrain the mass distribution in the outer regions, such as weak lensing or studies of dynamics.
Aims: We constrain the mass distribution of a cluster showing gravitational arcs by combining a strong lensing method with a dynamical method using the velocities of its 24 member galaxies.
Methods: We present a new framework in which we simultaneously fit SL and dynamical data. The SL analysis is based on the LENSTOOL software and the dynamical analysis uses the MAMPOSSt code, which we integrated into LENSTOOL. After describing the implementation of this new tool, we applied it to the galaxy group
Results: We confirm that the observed lensing features in
Conclusions: The combination of SL and dynamics tools yields a more accurate probe of the mass profile of
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 2016
- DOI:
- 10.1051/0004-6361/201628629
- arXiv:
- arXiv:1608.03687
- Bibcode:
- 2016A&A...595A..30V
- Keywords:
-
- gravitational lensing: strong;
- galaxies: groups: general;
- galaxies: groups: individual: SL2S J02140-0535;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Accepted by Astronomy and Astrophysics. A version with better resolution in the images is available at: https://goo.gl/nzypP3