NOAO >   Observing Info >   Approved Programs >   2011A-0597

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Proposal Information for 2011A-0597


PI: Maria Pereira, University of Arizona (Astronomy), mpereira@as.arizona.edu
Address: Department of Astronomy and Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA

CoI: Mike Lerchster, MPE Garching
CoI: Alexis Finoguenov, MPE Garching
CoI: Eiichi Egami, University of Arizona (Astronomy)

Title: RCSJ1419.2+5326: Kinematics of an assembling cluster at z 0.6

Abstract: As part of our ongoing multi-wavelength cluster survey in the CFHTLS Wide fields we have identified an assembling massive system at z 0.65. The system consists of 2 massive clusters (weak lensing and Chandra X-ray temperature both suggest M_200 5-10e14 Msun) separated by 3 Mpc and a filamentary structure connecting the two, which appears as an elongated overdensity at the same photometric redshift. One of the clusters has a BCG with a confirmed spectroscopic redshift of z=0.64, consistent with our photometric estimates, and is also known to be a strong lens cluster, with 2 bright giant arcs with no known spectroscopic redshifts. We propose here to perform spectroscopic follow-up of this field with GMOS on Gemini-N, in order to obtain spectra for 60 galaxies spanning the entire structure. With these spectra we will be able to make kinematic estimates of the masses of these systems and of the velocity dispersion of the filament, while also obtaining diagnostic spectral line measures for the member galaxies. We will also obtain spectra for the two brightest strong lens arcs, which, combined with the existing ACS/HST data will enable a strong lensing analysis of the cluster core.


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 >   2011A-0597

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