NOAO >   Observing Info >   Approved Programs >   2017B-0291

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Program Information for 2017B-0291


PI: Cristobal Sifon, Princeton U., sifon@astro.princeton.edu
Address: Department of Astrophysical Sciences, Peyton Hall, Princeton, NJ, 08544-1001 USA

CoI: Matt Hilton, University of KwaZulu-Natal
CoI: John P Hughes, Rutgers U.
CoI: Nicholas Battaglia, Princeton U.
CoI: Matthew Hasselfield, Behrend College, Pennsylvania State University
CoI: Kevin Huffenberger, Florida State U.
CoI: Brittany Fuzia, Florida State U.

Title: Spectroscopic confirmation of distant galaxy clusters discovered with ACTPol

Abstract: We propose to use Gemini/GMOS to confirm the four highest-confidence high-redshift (z>1) galaxy cluster candidates selected by ACTPol through their Sunyaev-Zel'dovich effect. The four candidates have been selected after careful inspection of all available archival data through public optical and near infrared surveys, and are detected as significant overdensities only in the near infrared. Our proposed observations would allow us to probe the physical conditions in the most massive clusters at the redshifts where the cluster galaxy population is transitioning into its present day form, dominated by "red and dead" elliptical galaxies, in contrast with the star forming galaxies that dominate the field and higher-redshift (z>1.5) clusters. We aim to obtain further clues as to the mechanism(s) that produced this transformation, aiding our understanding of galaxy evolution and the formation of present-day clusters.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2017B):  GEM-SQ/GMOSS -- 22.4hrs band 3 (GS-2017B-Q-76)


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NOAO >   Observing Info >   Approved Programs >   2017B-0291

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