NOAO >   Observing Info >   Approved Programs >   2014B-0310

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Proposal Information for 2014B-0310


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: Christopher Haines, Universidad de Chile
CoI: Arif Babul, University of Victoria
CoI: Eiichi Egami, University of Arizona (Astronomy)
CoI: Graham Smith, University of Birmingham
CoI: Felicia Ziparo, University of Birmingham
CoI: Alexis Finoguenov, University of Helsinki
CoI: Tim Rawle, European Space Astronomy Centre (ESAC), ESA

Title: LoCuSS: Pre-processing within X-ray-selected groups infalling into z 0.2 clusters

Abstract: Galaxy clusters assemble at late epochs, accreting a significant fraction of their mass and galaxy populations in the form of infalling galaxy groups. Measuring the rate at which clusters are accreting mass via groups is important both for cosmology but also the energy balance of their intra-cluster medium. Equally, "pre-processing" of star-forming spirals within infalling groups provides a promising explanation for the shortfall of star-forming galaxies observed at large cluster-centric radii, and the rapid decline in star formation among cluster galaxies since z 0.5. We propose a GMOS-N/S spectroscopic survey of 12 X-ray selected groups already confirmed to be infalling into massive clusters at z 0.2, to provide redshifts for 20-35 members per group. This will allow us to estimate group masses and their contribution to cluster growth, as well as quantify the relevance and effects of pre-processing on the evolution of star formation among the cluster galaxy population.


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 >   2014B-0310

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