NOAO > Observing Info > Approved Programs > 2009A-0126
|
NOAO > Observing Info > Approved Programs > 2009A-0126 |
|
PI: Karun Thanjavur, University of Victoria, karun@uvic.ca
Address: Department of Physics and Astronomy, PO Box 3055, Victoria, BC, V8W 3P6, Canada
CoI: Mark Swinbank, University of Durham
CoI: Philip Marshall, UC Santa Barbara
CoI: Jean-Paul Kneib, Laboratoire d'Astrophysique de Marseille
CoI: David Crampton, Herzberg Institute of Astrophysics
CoI: Jon Willis, University of Victoria
CoI: Members of SL2S Collaboration, Observatoire Midi-Pyrenees
Title: The relative distribution of visible and dark matter in galaxy groups selected by gravitational lensing
Abstract:
We aim to understand non-linear structure formation within the Lambda-CDM
framework by characterizing the mass distributions and mass/light ratios of
galaxy groups. These structures represent the critical break observed between
cluster and field galaxy mass scales. We use strong gravitational lensing and
dynamical mass measurements to probe, without significant bias, the mass
distribution up to the virial radius. With our 2007A GMOS/MOS proposal, we
successfully determined the velocity dispersions of 2 lensing groups from 15
candidates discovered in the CFHTLS-Wide fields with our automated search
method. For the 3 high-quality groups in this proposal, HST Cycle16 imaging
is already in hand. Confirmation of group membership, velocity dispersions
and lensed arc redshifts from this GMOS/MOS proposal are crucial for modeling
the lenses and thus determining their mass distribution. Our mass estimate
will be extended beyond the virial radius by weak lensing and X-ray
observations undertaken by our Strong Lensing Legacy Survey (SL2S)
collaborators.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
|
NOAO > Observing Info > Approved Programs > 2009A-0126 |
|