SPT-GMOS: A Gemini/GMOS-South Spectroscopic Survey Of Galaxy Clusters In The SPT-SZ Survey

Bayliss, M B and Ruel, J and Stubbs, C W and Allen, S W and Applegate, D E and Ashby, M L N and Bautz, M and Benson, B A and Bleem, L E and Bocquet, S and Brodwin, M and Capasso, R and Carlstrom, J E and Chang, C L and Chiu, I and Cho, H-M and Clocchiatti, A and Crawford, T M and Crites, A T and Haan, T de and Desai, Shantanu and Dietrich, J P and Dobbs, M A and Doucouliagos, A N and Foley, R J and Forman, W R and Garmire, G P and George, E M and Gladders, M D and Gonzalez, A H and Gupta, N and Halverson, N W and Hlavacek-Larrondo, J and Hoekstra, H and Holder, G P and Holzapfel, W L and Hou, Z and Hrubes, J D and Huang, N and Jones, C and Keisler, R and Knox, L and Lee, A T and Leitch, E M and Linden, A von der and Luong-Van, D and Mantz, A and Marrone, D P and McDonald, M and McMahon, J J and Meyer, S S and Mocanu, L M and Mohr, J J and Murray, S S and Padin, S and Pryke, C and Rapetti, D and Reichardt, C L and Rest, A and Ruhl, J E and Saliwanchik, B R and Saro, A and Sayre, J T and Schaffer, K K and Schrabback, T and Shirokoff, E and Song, J and Spieler, H G and Stalder, B and Stanford, S A and Staniszewski, Z and Stark, A A and Story, K T and Vanderlinde, K and Vieira, J D and Vikhlinin, A and Williamson, R and Zenteno, A (2016) SPT-GMOS: A Gemini/GMOS-South Spectroscopic Survey Of Galaxy Clusters In The SPT-SZ Survey. The Astrophysical Journal Supplement Series, 227 (1). p. 3. ISSN 1538-4365

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Abstract

We present the results of SPT-GMOS, a spectroscopic survey with the Gemini Multi-Object Spectrograph (GMOS) on Gemini South. The targets of SPT-GMOS are galaxy clusters identified in the SPT-SZ survey, a millimeter-wave survey of 2500 deg(2) of the southern sky using the South Pole Telescope (SPT). Multi-object spectroscopic observations of 62 SPT-selected galaxy clusters were performed between 2011 January and 2015 December, yielding spectra with radial velocity measurements for 2595 sources. We identify 2243 of these sources as galaxies, and 352 as stars. Of the galaxies, we identify 1579 as members of SPT-SZ galaxy clusters. The primary goal of these observations was to obtain spectra of cluster member galaxies to estimate cluster redshifts and velocity dispersions. We describe the full spectroscopic data set and resulting data products, including galaxy redshifts, cluster redshifts, and velocity dispersions, and measurements of several well-known spectral indices for each galaxy: the equivalent width, W, of [O II] lambda lambda 3727, 3729 and H-delta, and the 4000 angstrom break strength, D4000. We use the spectral indices to classify galaxies by spectral type (i.e., passive, post-starburst, star-forming), and we match the spectra against photometric catalogs to characterize spectroscopically observed cluster members as a function of brightness (relative to m*). Finally, we report several new measurements of redshifts for ten bright, strongly lensed background galaxies in the cores of eight galaxy clusters. Combining the SPT-GMOS data set with previous spectroscopic follow-up of SPT-SZ galaxy clusters results in spectroscopic measurements for >100 clusters, or similar to 20% of the full SPT-SZ sample.

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