Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA 02138 (United States)
Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305 (United States)
Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn (Germany)
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (United States)
Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 (United States)
Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States)
Department of Physics and Astronomy, University of Missouri, 5110 Rockhill Road, Kansas City, MO 64110 (United States)
Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich (Germany)
NIST Quantum Devices Group, Boulder, CO 80305 (United States)
Departamento de Astronomia y Astrosifica, Pontificia Universidad Catolica (Chile)
California Institute of Technology, Pasadena, CA 91125 (United States)
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{sup 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] λλ 3727, 3729 and H- δ , and the 4000 Å 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 {sup ⋆}). 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 ∼20% of the full SPT-SZ sample.
Bayliss, M. B., et al. "SPT-GMOS: A GEMINI/GMOS-SOUTH SPECTROSCOPIC SURVEY OF GALAXY CLUSTERS IN THE SPT-SZ SURVEY." Astrophysical Journal, Supplement Series, vol. 227, no. 1, Nov. 2016. https://doi.org/10.3847/0067-0049/227/1/3
Bayliss, M. B., Ruel, J., Stubbs, C. W., Allen, S. W., Applegate, D. E., Ashby, M. L. N., Bautz, M., Benson, B. A., Carlstrom, J. E., Chang, C. L., Crawford, T. M., Bleem, L. E., Bocquet, S., Brodwin, M., Capasso, R., Chiu, I., Cho, H-M., Clocchiatti, A., Crites, A. T., & others, and (2016). SPT-GMOS: A GEMINI/GMOS-SOUTH SPECTROSCOPIC SURVEY OF GALAXY CLUSTERS IN THE SPT-SZ SURVEY. Astrophysical Journal, Supplement Series, 227(1). https://doi.org/10.3847/0067-0049/227/1/3
Bayliss, M. B., Ruel, J., Stubbs, C. W., et al., "SPT-GMOS: A GEMINI/GMOS-SOUTH SPECTROSCOPIC SURVEY OF GALAXY CLUSTERS IN THE SPT-SZ SURVEY," Astrophysical Journal, Supplement Series 227, no. 1 (2016), https://doi.org/10.3847/0067-0049/227/1/3
@article{osti_22661348,
author = {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 Carlstrom, J. E. and Chang, C. L. and others},
title = {SPT-GMOS: A GEMINI/GMOS-SOUTH SPECTROSCOPIC SURVEY OF GALAXY CLUSTERS IN THE SPT-SZ SURVEY},
annote = {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{sup 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] λλ 3727, 3729 and H- δ , and the 4000 Å 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 {sup ⋆}). 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 ∼20% of the full SPT-SZ sample.},
doi = {10.3847/0067-0049/227/1/3},
url = {https://www.osti.gov/biblio/22661348},
journal = {Astrophysical Journal, Supplement Series},
issn = {ISSN APJSA2},
number = {1},
volume = {227},
place = {United States},
year = {2016},
month = {11}}