NOAO >   Observing Info >   Approved Programs >   2017B-0302

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Program Information for 2017B-0302


PI: Alfredo Zenteno, CTIO, alfredo@ctio.noao.edu
Address: Casilla 603, La Serena Chile

CoI: Rodrigo Carrasco, Gemini Observatory
CoI: Daniel Gruen, Stanford U.
CoI: Matthias Klein, MPE, Garching, Germany

Title: Clash of Titans: a dynamical study of a sample of massive galaxy clusters undergoing extreme mergers

Abstract: Galaxy clusters undergoing extreme mergers, like the Bullet Cluster, are difficult to find, but they can provide constraints on cosmological models, offer important insights into how galaxy clusters evolve, on how they shape the evolution of the galaxies within them, and even can provide information about the dark matter particle self-interaction cross-section. Some of the most massive clusters in the Universe have been detected by the South Pole Telescope (SPT) using the Sunyaev-Zeldovich (SZ) effect. Out of a sample of 241 SPT-selected clusters with DES data, we have selected 12 highly disturbed systems (0.3 < z < 0.7) where the BCG is significantly displaced from the cluster SZ peak. A previous study of the luminosity function of z<0.1 clusters shows that the faint end is steeper in relaxed clusters than disturbed systems, but our work spanning a broader redshift range seems to show that the opposite case is true. Gemini/GMOS data will be able to confirm the dynamical state of the clusters and will provide the means to characterize the cluster dynamics which can be use for more detailed modeling of these 12 massive collisional systems.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2017B):  GEM-SQ/GMOSS -- 14.4hrs band 3 (GS-2017B-Q-82)


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 >   2017B-0302

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