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1. Cluster mass calibration at high redshift: HST weak lensing analysis of 13 distant galaxy clusters from the South Pole Telescope Sunyaev–Zel'dovich Survey

Author

MIT Kavli Institute for Astrophysics and Space Research, Schrabback, T, Applegate, D, Dietrich, JP, Hoekstra, H, Bocquet, S, Gonzalez, AH, von der Linden, A, McDonald, M, Morrison, CB, Raihan, SF, Allen, SW, Bayliss, M, Benson, BA, Bleem, LE, Chiu, I, Desai, S, Foley, RJ, de Haan, T, High, FW, Hilbert, S, Mantz, AB, Massey, R, Mohr, J, Reichardt, CL, Saro, A, Simon, P, Stern, C, Stubbs, CW, Zenteno, A, MIT Kavli Institute for Astrophysics and Space Research, Schrabback, T, Applegate, D, Dietrich, JP, Hoekstra, H, Bocquet, S, Gonzalez, AH, von der Linden, A, McDonald, M, Morrison, CB, Raihan, SF, Allen, SW, Bayliss, M, Benson, BA, Bleem, LE, Chiu, I, Desai, S, Foley, RJ, de Haan, T, High, FW, Hilbert, S, Mantz, AB, Massey, R, Mohr, J, Reichardt, CL, Saro, A, Simon, P, Stern, C, Stubbs, CW, and Zenteno, A

Abstract

© 2017 The Author(s). We present an HST/Advanced Camera for Surveys (ACS) weak gravitational lensing analysis of 13 massive high-redshift (zmedian = 0.88) galaxy clusters discovered in the South Pole Telescope (SPT) Sunyaev-Zel'dovich Survey. This study is part of a larger campaign that aims to robustly calibrate mass-observable scaling relations over a wide range in redshift to enable improved cosmological constraints from the SPT cluster sample. We introduce new strategies to ensure that systematics in the lensing analysis do not degrade constraints on cluster scaling relations significantly. First, we efficiently remove cluster members from the source sample by selecting very blue galaxies in V - I colour. Our estimate of the source redshift distribution is based on Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) data, where we carefully mimic the source selection criteria of the cluster fields. We apply a statistical correction for systematic photometric redshift errors as derived from Hubble Ultra Deep Field data and verified through spatial cross-correlations. We account for the impact of lensing magnification on the source redshift distribution, finding that this is particularly relevant for shallower surveys. Finally, we account for biases in the mass modelling caused by miscentring and uncertainties in the concentration-mass relation using simulations. In combination with temperature estimates from Chandra we constrain the normalization of the mass-temperature scaling relation ln (E(z)M500c/1014M⊙) = A + 1.5ln (kT/7.2 keV) to A = 1.81 -0.14+0.24(stat.) ± 0.09(sys.), consistent with self-similar redshift evolution when compared to lower redshift samples. Additionally, the lensing data constrain the average concentration of the clusters to c200c = 5.6-1.8+3.7.

Published
2021

2. Cluster mass calibration at high redshift: HST weak lensing analysis of 13 distant galaxy clusters from the South Pole Telescope Sunyaev-Zel'dovich Survey

Author

Schrabback, T, Applegate, D, Dietrich, JP, Hoekstra, H, Bocquet, S, Gonzalez, AH, von der Linden, A, McDonald, M, Morrison, CB, Raihan, SF, Allen, SW, Bayliss, M, Benson, BA, Bleem, LE, Chiu, I, Desai, S, Foley, RJ, de Haan, T, High, FW, Hilbert, S, Mantz, AB, Massey, R, Mohr, J, Reichardt, CL, Saro, A, Simon, P, Stern, C, Stubbs, CW, Zenteno, A, Schrabback, T, Applegate, D, Dietrich, JP, Hoekstra, H, Bocquet, S, Gonzalez, AH, von der Linden, A, McDonald, M, Morrison, CB, Raihan, SF, Allen, SW, Bayliss, M, Benson, BA, Bleem, LE, Chiu, I, Desai, S, Foley, RJ, de Haan, T, High, FW, Hilbert, S, Mantz, AB, Massey, R, Mohr, J, Reichardt, CL, Saro, A, Simon, P, Stern, C, Stubbs, CW, and Zenteno, A

Published
2018

3. Optical Spectroscopy and Velocity Dispersions of Galaxy Clusters from the SPT-SZ Survey

Author

Ruel, J, Bazin, G, Bayliss, M, Brodwin, M, Foley, RJ, Stalder, B, Aird, KA, Armstrong, R, Ashby, MLN, Bautz, M, Benson, BA, Bleem, LE, Bocquet, S, Carlstrom, JE, Chang, CL, Chapman, SC, Cho, HM, Clocchiatti, A, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Forman, WR, George, EM, Gladders, MD, Gonzalez, AH, Halverson, NW, Harrington, NL, High, FW, Holder, GP, Holzapfel, WL, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Mocanu, L, Mohr, JJ, Montroy, TE, Murray, SS, Natoli, T, Nurgaliev, D, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, v Suhada, R, Spieler, HG, Stanford, SA, Staniszewski, Z, Starsk, AA, Story, K, Stubbs, CW, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, O, Zenteno, A, Ruel, J, Bazin, G, Bayliss, M, Brodwin, M, Foley, RJ, Stalder, B, Aird, KA, Armstrong, R, Ashby, MLN, Bautz, M, Benson, BA, Bleem, LE, Bocquet, S, Carlstrom, JE, Chang, CL, Chapman, SC, Cho, HM, Clocchiatti, A, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Forman, WR, George, EM, Gladders, MD, Gonzalez, AH, Halverson, NW, Harrington, NL, High, FW, Holder, GP, Holzapfel, WL, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Mocanu, L, Mohr, JJ, Montroy, TE, Murray, SS, Natoli, T, Nurgaliev, D, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, v Suhada, R, Spieler, HG, Stanford, SA, Staniszewski, Z, Starsk, AA, Story, K, Stubbs, CW, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, O, and Zenteno, A

Abstract

We present optical spectroscopy of galaxies in clusters detected through the Sunyaev-Zel'dovich (SZ) effect with the South Pole Telescope (SPT). We report our own measurements of $61$ spectroscopic cluster redshifts, and $48$ velocity dispersions each calculated with more than $15$ member galaxies. This catalog also includes $19$ dispersions of SPT-observed clusters previously reported in the literature. The majority of the clusters in this paper are SPT-discovered; of these, most have been previously reported in other SPT cluster catalogs, and five are reported here as SPT discoveries for the first time. By performing a resampling analysis of galaxy velocities, we find that unbiased velocity dispersions can be obtained from a relatively small number of member galaxies ($\lesssim 30$), but with increased systematic scatter. We use this analysis to determine statistical confidence intervals that include the effect of membership selection. We fit scaling relations between the observed cluster velocity dispersions and mass estimates from SZ and X-ray observables. In both cases, the results are consistent with the scaling relation between velocity dispersion and mass expected from dark-matter simulations. We measure a $\sim$30% log-normal scatter in dispersion at fixed mass, and a $\sim$10% offset in the normalization of the dispersion-mass relation when compared to the expectation from simulations, which is within the expected level of systematic uncertainty.

Published
2014

4. SPT-CL J2040-4451: AN SZ-SELECTED GALAXY CLUSTER AT z=1.478 WITH SIGNIFICANT ONGOING STAR FORMATION

Author

Bayliss, MB, Ashby, MLN, Ruel, J, Brodwin, M, Aird, KA, Bautz, MW, Benson, BA, Bleem, LE, Bocquet, S, Carlstrom, JE, Chang, CL, Cho, HM, Clocchiattii, A, Crawford, TM, Crites, AT, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, Forman, WR, George, EM, Gettings, D, Gladders, MD, Gonzalez, AH, de Haan, T, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, Mawatari, K, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Miller, ED, Mocanu, L, Mohr, JJ, Montroy, TE, Murray, SS, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shirokoff, E, Song, J, Stalder, B, Suhada, R, Spieler, HG, Stanford, SA, Staniszewski, Z, Stark, AA, Story, K, Stubbs, CW, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, R, Zenteno, A, Bayliss, MB, Ashby, MLN, Ruel, J, Brodwin, M, Aird, KA, Bautz, MW, Benson, BA, Bleem, LE, Bocquet, S, Carlstrom, JE, Chang, CL, Cho, HM, Clocchiattii, A, Crawford, TM, Crites, AT, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, Forman, WR, George, EM, Gettings, D, Gladders, MD, Gonzalez, AH, de Haan, T, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, Mawatari, K, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Miller, ED, Mocanu, L, Mohr, JJ, Montroy, TE, Murray, SS, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shirokoff, E, Song, J, Stalder, B, Suhada, R, Spieler, HG, Stanford, SA, Staniszewski, Z, Stark, AA, Story, K, Stubbs, CW, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, R, and Zenteno, A

Abstract

SPT-CLJ2040-4451 -- spectroscopically confirmed at z = 1.478 -- is the highest redshift galaxy cluster yet discovered via the Sunyaev-Zel'dovich effect. SPT-CLJ2040-4451 was a candidate galaxy cluster identified in the first 720 deg^2 of the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey, and confirmed in follow-up imaging and spectroscopy. From multi-object spectroscopy with Magellan-I/Baade+IMACS we measure spectroscopic redshifts for 15 cluster member galaxies, all of which have strong [O II] 3727 emission. SPT-CLJ2040-4451 has an SZ-measured mass of M_500,SZ = 3.2 +/- 0.8 X 10^14 M_Sun/h_70, corresponding to M_200,SZ = 5.8 +/- 1.4 X 10^14 M_Sun/h_70. The velocity dispersion measured entirely from blue star forming members is sigma_v = 1500 +/- 520 km/s. The prevalence of star forming cluster members (galaxies with > 1.5 M_Sun/yr) implies that this massive, high-redshift cluster is experiencing a phase of active star formation, and supports recent results showing a marked increase in star formation occurring in galaxy clusters at z >1.4. We also compute the probability of finding a cluster as rare as this in the SPT-SZ survey to be >99%, indicating that its discovery is not in tension with the concordance Lambda-CDM cosmological model.

Published
2014

5. SPT-CL J0205-5829: A z=1.32 EVOLVED MASSIVE GALAXY CLUSTER IN THE SOUTH POLE TELESCOPE SUNYAEV-ZEL'DOVICH EFFECT SURVEY

Author

Stalder, B, Ruel, J, Suhada, R, Brodwin, M, Aird, KA, Andersson, K, Armstrong, R, Ashby, MLN, Bautz, M, Bayliss, M, Bazin, G, Benson, BA, Bleem, LE, Carlstrom, JE, Chang, CL, Cho, HM, Clocchiatti, A, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, Forman, WR, George, EM, Gettings, D, Gladders, MD, Gonzalez, AH, Halverson, NW, Harrington, NL, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Mocanu, L, Mohr, JJ, Montroy, TE, Murray, SS, Natoli, T, Nurgaliev, D, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Stanford, SA, Staniszewski, Z, Stark, AA, Story, K, Stubbs, CW, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, O, Zenteno, A, Stalder, B, Ruel, J, Suhada, R, Brodwin, M, Aird, KA, Andersson, K, Armstrong, R, Ashby, MLN, Bautz, M, Bayliss, M, Bazin, G, Benson, BA, Bleem, LE, Carlstrom, JE, Chang, CL, Cho, HM, Clocchiatti, A, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, Forman, WR, George, EM, Gettings, D, Gladders, MD, Gonzalez, AH, Halverson, NW, Harrington, NL, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Mocanu, L, Mohr, JJ, Montroy, TE, Murray, SS, Natoli, T, Nurgaliev, D, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Stanford, SA, Staniszewski, Z, Stark, AA, Story, K, Stubbs, CW, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, O, and Zenteno, A

Abstract

The galaxy cluster SPT-CL J0205-5829 currently has the highest spectroscopically-confirmed redshift, z=1.322, in the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey. XMM-Newton observations measure a core-excluded temperature of Tx=8.7keV producing a mass estimate that is consistent with the Sunyaev-Zel'dovich derived mass. The combined SZ and X-ray mass estimate of M500=(4.9+/-0.8)e14 h_{70}^{-1} Msun makes it the most massive known SZ-selected galaxy cluster at z>1.2 and the second most massive at z>1. Using optical and infrared observations, we find that the brightest galaxies in SPT-CL J0205-5829 are already well evolved by the time the universe was <5 Gyr old, with stellar population ages >3 Gyr, and low rates of star formation (<0.5Msun/yr). We find that, despite the high redshift and mass, the existence of SPT-CL J0205-5829 is not surprising given a flat LambdaCDM cosmology with Gaussian initial perturbations. The a priori chance of finding a cluster of similar rarity (or rarer) in a survey the size of the 2500 deg^2 SPT-SZ survey is 69%.

Published
2013

6. COSMOLOGICAL CONSTRAINTS FROM SUNYAEV-ZEL'DOVICH-SELECTED CLUSTERS WITH X-RAY OBSERVATIONS IN THE FIRST 178 deg2 OF THE SOUTH POLE TELESCOPE SURVEY

Author

Benson, BA, de Haan, T, Dudley, JP, Reichardt, CL, Aird, KA, Andersson, K, Armstrong, R, Ashby, MLN, Bautz, M, Bayliss, M, Bazin, G, Bleem, LE, Brodwin, M, Carlstrom, JE, Chang, CL, Cho, HM, Clocchiatti, A, Crawford, TM, Crites, AT, Desai, S, Dobbs, MA, Foley, RJ, Forman, WR, George, EM, Gladders, MD, Gonzalez, AH, Halverson, NW, Harrington, N, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Mocanu, L, Mohr, JJ, Montroy, TE, Murray, SS, Natoli, T, Padin, S, Plagge, T, Pryke, C, Rest, A, Ruel, J, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Story, K, Stubbs, CW, Suhada, R, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, O, Zenteno, A, Benson, BA, de Haan, T, Dudley, JP, Reichardt, CL, Aird, KA, Andersson, K, Armstrong, R, Ashby, MLN, Bautz, M, Bayliss, M, Bazin, G, Bleem, LE, Brodwin, M, Carlstrom, JE, Chang, CL, Cho, HM, Clocchiatti, A, Crawford, TM, Crites, AT, Desai, S, Dobbs, MA, Foley, RJ, Forman, WR, George, EM, Gladders, MD, Gonzalez, AH, Halverson, NW, Harrington, N, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Mocanu, L, Mohr, JJ, Montroy, TE, Murray, SS, Natoli, T, Padin, S, Plagge, T, Pryke, C, Rest, A, Ruel, J, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Story, K, Stubbs, CW, Suhada, R, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, O, and Zenteno, A

Abstract

We use measurements from the South Pole Telescope (SPT) Sunyaev Zel'dovich (SZ) cluster survey in combination with X-ray measurements to constrain cosmological parameters. We present a statistical method that fits for the scaling relations of the SZ and X-ray cluster observables with mass while jointly fitting for cosmology. The method is generalizable to multiple cluster observables, and self-consistently accounts for the effects of the cluster selection and uncertainties in cluster mass calibration on the derived cosmological constraints. We apply this method to a data set consisting of an SZ-selected catalog of 18 galaxy clusters at z > 0.3 from the first 178 deg2 of the 2500 deg2 SPT-SZ survey, with 14 clusters having X-ray observations from either Chandra or XMM. Assuming a spatially flat LCDM cosmological model, we find the SPT cluster sample constrain sigma_8 (Omega_m/0.25)^0.30 = 0.785 +- 0.037. In combination with measurements of the CMB power spectrum from the SPT and the seven-year WMAP data, the SPT cluster sample constrain sigma_8 = 0.795 +- 0.016 and Omega_m = 0.255 +- 0.016, a factor of 1.5 improvement on each parameter over the CMB data alone. We consider several extensions beyond the LCDM model by including the following as free parameters: the dark energy equation of state (w), the sum of the neutrino masses (sum mnu), the effective number of relativistic species (Neff), and a primordial non-Gaussianity (fNL). We find that adding the SPT cluster data significantly improves the constraints on w and sum mnu beyond those found when using measurements of the CMB, supernovae, baryon acoustic oscillations, and the Hubble constant. Considering each extension independently, we best constrain w=-0.973 +- 0.063 and the sum of neutrino masses sum mnu < 0.28 eV at 95% confidence, a factor of 1.25 and 1.4 improvement, respectively, over the constraints without clusters. [abbrev.]

Published
2013

7. GALAXY CLUSTERS DISCOVERED VIA THE SUNYAEV-ZEL'DOVICH EFFECT IN THE FIRST 720 SQUARE DEGREES OF THE SOUTH POLE TELESCOPE SURVEY

Author

Reichardt, CL, Stalder, B, Bleem, LE, Montroy, TE, Aird, KA, Andersson, K, Armstrong, R, Ashby, MLN, Bautz, M, Bayliss, M, Bazin, G, Benson, BA, Brodwin, M, Carlstrom, JE, Chang, CL, Cho, HM, Clocchiatti, A, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, Forman, WR, George, EM, Gladders, MD, Gonzalez, AH, Halverson, NW, Harrington, NL, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Mocanu, L, Mohr, JJ, Murray, SS, Natoli, T, Padin, S, Plagge, T, Pryke, C, Rest, A, Ruel, J, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Staniszewski, Z, Stark, AA, Story, K, Stubbs, CW, Suhada, R, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, O, Zenteno, A, Reichardt, CL, Stalder, B, Bleem, LE, Montroy, TE, Aird, KA, Andersson, K, Armstrong, R, Ashby, MLN, Bautz, M, Bayliss, M, Bazin, G, Benson, BA, Brodwin, M, Carlstrom, JE, Chang, CL, Cho, HM, Clocchiatti, A, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, Forman, WR, George, EM, Gladders, MD, Gonzalez, AH, Halverson, NW, Harrington, NL, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Liu, J, Lueker, M, Luong-Van, D, Mantz, A, Marrone, DP, McDonald, M, McMahon, JJ, Mehl, J, Meyer, SS, Mocanu, L, Mohr, JJ, Murray, SS, Natoli, T, Padin, S, Plagge, T, Pryke, C, Rest, A, Ruel, J, Ruhl, JE, Saliwanchik, BR, Saro, A, Sayre, JT, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Staniszewski, Z, Stark, AA, Story, K, Stubbs, CW, Suhada, R, van Engelen, A, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Zahn, O, and Zenteno, A

Abstract

We present a catalog of 224 galaxy cluster candidates, selected through their Sunyaev-Zel'dovich (SZ) effect signature in the first 720 deg2 of the South Pole Telescope (SPT) survey. This area was mapped with the SPT in the 2008 and 2009 austral winters to a depth of 18 uK-arcmin at 150 GHz; 550 deg2 of it was also mapped to 44 uK-arcmin at 95 GHz. Based on optical imaging of all candidates and near-infrared imaging of the majority of candidates, we have found optical and/or infrared counterparts for 158 clusters. Of these, 135 were first identified as clusters in SPT data, including 117 new discoveries reported in this work. This catalog triples the number of confirmed galaxy clusters discovered through the SZ effect. We report photometrically derived (and in some cases spectroscopic) redshifts for confirmed clusters and redshift lower limits for the remaining candidates. The catalog extends to high redshift with a median redshift of z = 0.55 and maximum redshift of z = 1.37. Based on simulations, we expect the catalog to be nearly 100% complete above M500 ~ 5e14 Msun h_{70}^-1 at z > 0.6. There are 121 candidates detected at signal-to-noise greater than five, at which the catalog purity is measured to be 95%. From this high-purity subsample, we exclude the z < 0.3 clusters and use the remaining 100 candidates to improve cosmological constraints following the method presented by Benson et al., 2011. Adding the cluster data to CMB+BAO+H0 data leads to a preference for non-zero neutrino masses while only slightly reducing the upper limit on the sum of neutrino masses to sum mnu < 0.38 eV (95% CL). For a spatially flat wCDM cosmological model, the addition of this catalog to the CMB+BAO+H0+SNe results yields sigma8=0.807+-0.027 and w = -1.010+-0.058, improving the constraints on these parameters by a factor of 1.4 and 1.3, respectively. [abbrev]

Published
2013

8. X-RAY PROPERTIES OF THE FIRST SUNYAEV-ZEL'DOVICH EFFECT SELECTED GALAXY CLUSTER SAMPLE FROM THE SOUTH POLE TELESCOPE

Author

Andersson, K, Benson, BA, Ade, PAR, Aird, KA, Armstrong, B, Bautz, M, Bleem, LE, Brodwin, M, Carlstrom, JE, Chang, CL, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, Forman, WR, Garmire, G, George, EM, Gladders, MD, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Lueker, M, Marrone, DP, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Murray, SS, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruel, J, Ruhl, JE, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Stubbs, CW, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Yang, Y, Zahn, O, Zenteno, A, Andersson, K, Benson, BA, Ade, PAR, Aird, KA, Armstrong, B, Bautz, M, Bleem, LE, Brodwin, M, Carlstrom, JE, Chang, CL, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, Forman, WR, Garmire, G, George, EM, Gladders, MD, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hrubes, JD, Jones, C, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Lueker, M, Marrone, DP, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Murray, SS, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruel, J, Ruhl, JE, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Stubbs, CW, Vanderlinde, K, Vieira, JD, Vikhlinin, A, Williamson, R, Yang, Y, Zahn, O, and Zenteno, A

Abstract

We present results of X-ray observations of a sample of 15 clusters selected via their imprint on the cosmic microwave background (CMB) from the thermal Sunyaev-Zel'dovich (SZ) effect. These clusters are a subset of the first SZ-selected cluster catalog, obtained from observations of 178 deg^2 of sky surveyed by the South Pole Telescope. Using X-ray observations with Chandra and XMM-Newton, we estimate the temperature, T_X, and mass, M_g, of the intracluster medium (ICM) within r_500 for each cluster. From these, we calculate Y_X=M_g T_X and estimate the total cluster mass using a M_500-Y_X scaling relation measured from previous X-ray studies. The integrated Comptonization, Y_SZ, is derived from the SZ measurements, using additional information from the X-ray measured gas density profiles and a universal temperature profile. We calculate scaling relations between the X-ray and SZ observables, and find results generally consistent with other measurements and the expectations from simple self-similar behavior. Specifically, we fit a Y_SZ-Y_X relation and find a normalization of 0.82 +- 0.07, marginally consistent with the predicted ratio of Y_SZ/Y_X=0.91+-0.01 that would be expected from the density and temperature models used in this work. Using the Y_X derived mass estimates, we fit a Y_SZ-M_500 relation and find a slope consistent with the self-similar expectation of Y_SZ ~ M^5/3 with a normalization consistent with predictions from other X-ray studies. We compare the X-ray mass estimates to previously published SZ mass estimates derived from cosmological simulations of the SPT survey. We find that the SZ mass estimates are lower by a factor of 0.89+-0.06, which is within the ~15% systematic uncertainty quoted for the simulation-based SZ masses.

Published
2011

9. SOUTH POLE TELESCOPE DETECTIONS OF THE PREVIOUSLY UNCONFIRMED PLANCK EARLY SUNYAEV-ZEL'DOVICH CLUSTERS IN THE SOUTHERN HEMISPHERE

Author

Story, K, Aird, KA, Andersson, K, Armstrong, R, Bazin, G, Benson, BA, Bleem, LE, Bonamente, M, Brodwin, M, Carlstrom, JE, Chang, CL, Clocchiatti, A, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, George, EM, Gladders, MD, Gonzalez, AH, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Lueker, M, Luong-Van, D, Marrone, DP, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruel, J, Ruhl, JE, Saliwanchik, BR, Saro, A, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Stubbs, CW, Vanderlinde, K, Vieira, JD, Williamson, R, Zenteno, A, Story, K, Aird, KA, Andersson, K, Armstrong, R, Bazin, G, Benson, BA, Bleem, LE, Bonamente, M, Brodwin, M, Carlstrom, JE, Chang, CL, Clocchiatti, A, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, George, EM, Gladders, MD, Gonzalez, AH, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hoover, S, Hrubes, JD, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Lueker, M, Luong-Van, D, Marrone, DP, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruel, J, Ruhl, JE, Saliwanchik, BR, Saro, A, Schaffer, KK, Shaw, L, Shirokoff, E, Song, J, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Stubbs, CW, Vanderlinde, K, Vieira, JD, Williamson, R, and Zenteno, A

Abstract

We present South Pole Telescope (SPT) observations of the five galaxy cluster candidates in the southern hemisphere which were reported as unconfirmed in the Planck Early Sunyaev-Zel'dovich (ESZ) sample. One cluster candidate, PLCKESZ G255.62-46.16, is located in the 2500-square-degree SPT SZ survey region and was reported previously as SPT-CL J0411-4819. For the remaining four candidates, which are located outside of the SPT SZ survey region, we performed short, dedicated SPT observations. Each of these four candidates was strongly detected in maps made from these observations, with signal-to-noise ratios ranging from 6.3 to 13.8. We have observed these four candidates on the Magellan-Baade telescope and used these data to estimate cluster redshifts from the red sequence. Resulting redshifts range from 0.24 to 0.46. We report measurements of Y_0.75', the integrated Comptonization within a 0.75' radius, for all five candidates. We also report X-ray luminosities calculated from ROSAT All-Sky Survey catalog counts, as well as optical and improved SZ coordinates for each candidate. The combination of SPT SZ measurements, optical red-sequence measurements, and X-ray luminosity estimates demonstrates that these five Planck ESZ cluster candidates do indeed correspond to real galaxy clusters with redshifts and observable properties consistent with the rest of the ESZ sample.

Published
2011

10. OPTICAL REDSHIFT AND RICHNESS ESTIMATES FOR GALAXY CLUSTERS SELECTED WITH THE SUNYAEV-ZEL'DOVICH EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS

Author

High, FW, Stalder, B, Song, J, Ade, PAR, Aird, KA, Allam, SS, Armstrong, R, Barkhouse, WA, Benson, BA, Bertin, E, Bhattacharya, S, Bleem, LE, Brodwin, M, Buckley-Geer, EJ, Carlstrom, JE, Challis, P, Chang, CL, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, George, EM, Gladders, M, Halverson, NW, Hamuy, M, Hansen, SM, Holder, GP, Holzapfel, WL, Hrubes, JD, Joy, M, Keisler, R, Lee, AT, Leitch, EM, Lin, H, Lin, Y-T, Loehr, A, Lueker, M, Marrone, D, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Morell, N, Ngeow, C-C, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruel, J, Ruhl, JE, Schaffer, KK, Shaw, L, Shirokoff, E, Smith, RC, Spieler, HG, Staniszewski, Z, Stark, AA, Stubbs, CW, Tucker, DL, Vanderlinde, K, Vieira, JD, Williamson, R, Wood-Vasey, WM, Yang, Y, Zahn, O, Zenteno, A, High, FW, Stalder, B, Song, J, Ade, PAR, Aird, KA, Allam, SS, Armstrong, R, Barkhouse, WA, Benson, BA, Bertin, E, Bhattacharya, S, Bleem, LE, Brodwin, M, Buckley-Geer, EJ, Carlstrom, JE, Challis, P, Chang, CL, Crawford, TM, Crites, AT, de Haan, T, Desai, S, Dobbs, MA, Dudley, JP, Foley, RJ, George, EM, Gladders, M, Halverson, NW, Hamuy, M, Hansen, SM, Holder, GP, Holzapfel, WL, Hrubes, JD, Joy, M, Keisler, R, Lee, AT, Leitch, EM, Lin, H, Lin, Y-T, Loehr, A, Lueker, M, Marrone, D, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Morell, N, Ngeow, C-C, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruel, J, Ruhl, JE, Schaffer, KK, Shaw, L, Shirokoff, E, Smith, RC, Spieler, HG, Staniszewski, Z, Stark, AA, Stubbs, CW, Tucker, DL, Vanderlinde, K, Vieira, JD, Williamson, R, Wood-Vasey, WM, Yang, Y, Zahn, O, and Zenteno, A

Abstract

We present redshifts and optical richness properties of 21 galaxy clusters uniformly selected by their Sunyaev-Zel'dovich signature. These clusters, plus an additional, unconfirmed candidate, were detected in a 178 square-degree area surveyed by the South Pole Telescope in 2008. Using griz imaging from the Blanco Cosmology Survey and from pointed Magellan telescope observations, as well as spectroscopy using Magellan facilities, we confirm the existence of clustered red-sequence galaxies, report red-sequence photometric redshifts, present spectroscopic redshifts for a subsample, and derive R_200 radii and M_200 masses from optical richness. The clusters span redshifts from 0.15 to greater than 1, with a median redshift of 0.74; three clusters are estimated to be at z > 1. Redshifts inferred from mean red-sequence colors exhibit 2% RMS scatter in sigma_z/(1+z) with respect to the spectroscopic subsample for z < 1. We show that M_200 cluster masses derived from optical richness correlate with masses derived from South Pole Telescope data and agree with previously derived scaling relations to within the uncertainties. Optical and infrared imaging is an efficient means of cluster identification and redshift estimation in large Sunyaev-Zel'dovich surveys, and exploiting the same data for richness measurements, as we have done, will be useful for constraining cluster masses and radii for large samples in cosmological analysis.

Published
2010

11. EXTRAGALACTIC MILLIMETER-WAVE SOURCES IN SOUTH POLE TELESCOPE SURVEY DATA: SOURCE COUNTS, CATALOG, AND STATISTICS FOR AN 87 SQUARE-DEGREE FIELD

Author

Vieira, JD, Crawford, TM, Switzer, ER, Ade, PAR, Aird, KA, Ashby, MLN, Benson, BA, Bleem, LE, Brodwin, M, Carlstrom, JE, Chang, CL, Cho, H-M, Crites, AT, de Haan, T, Dobbs, MA, Everett, W, George, EM, Gladders, M, Hall, NR, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hrubes, JD, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Lueker, M, Marrone, DP, McIntyre, V, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Ruhl, JE, Schaffer, KK, Shaw, L, Shirokoff, E, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Vanderlinde, K, Walsh, W, Williamson, R, Yang, Y, Zahn, O, Zenteno, A, Vieira, JD, Crawford, TM, Switzer, ER, Ade, PAR, Aird, KA, Ashby, MLN, Benson, BA, Bleem, LE, Brodwin, M, Carlstrom, JE, Chang, CL, Cho, H-M, Crites, AT, de Haan, T, Dobbs, MA, Everett, W, George, EM, Gladders, M, Hall, NR, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hrubes, JD, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Lueker, M, Marrone, DP, McIntyre, V, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Ruhl, JE, Schaffer, KK, Shaw, L, Shirokoff, E, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Vanderlinde, K, Walsh, W, Williamson, R, Yang, Y, Zahn, O, and Zenteno, A

Abstract

We report the results of an 87 square-degree point-source survey centered at R.A. 5h30m, decl. -55 deg. taken with the South Pole Telescope (SPT) at 1.4 and 2.0 mm wavelengths with arc-minute resolution and milli-Jansky depth. Based on the ratio of flux in the two bands, we separate the detected sources into two populations, one consistent with synchrotron emission from active galactic nuclei (AGN) and one consistent with thermal emission from dust. We present source counts for each population from 11 to 640 mJy at 1.4 mm and from 4.4 to 800 mJy at 2.0 mm. The 2.0 mm counts are dominated by synchrotron-dominated sources across our reported flux range; the 1.4 mm counts are dominated by synchroton-dominated sources above ~15 mJy and by dust-dominated sources below that flux level. We detect 141 synchrotron-dominated sources and 47 dust-dominated sources at S/N > 4.5 in at least one band. All of the most significantly detected members of the synchrotron-dominated population are associated with sources in previously published radio catalogs. Some of the dust-dominated sources are associated with nearby (z << 1) galaxies whose dust emission is also detected by the Infrared Astronomy Satellite (IRAS). However, most of the bright, dust-dominated sources have no counterparts in any existing catalogs. We argue that these sources represent the rarest and brightest members of the population commonly referred to as sub-millimeter galaxies (SMGs). Because these sources are selected at longer wavelengths than in typical SMG surveys, they are expected to have a higher mean redshift distribution and may provide a new window on galaxy formation in the early universe.

Published
2010

12. GALAXY CLUSTERS SELECTED WITH THE SUNYAEV-ZEL'DOVICH EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS

Author

Vanderlinde, K, Crawford, TM, de Haan, T, Dudley, JP, Shaw, L, Ade, PAR, Aird, KA, Benson, BA, Bleem, LE, Brodwin, M, Carlstrom, JE, Chang, CL, Crites, AT, Desai, S, Dobbs, MA, Foley, RJ, George, EM, Gladders, MD, Hall, NR, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hrubes, JD, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Loehr, A, Lueker, M, Marrone, DP, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Ngeow, C-C, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruel, J, Ruhl, JE, Schaffer, KK, Shirokoff, E, Song, J, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Stubbs, CW, van Engelen, A, Vieira, JD, Williamson, R, Yang, Y, Zahn, O, Zenteno, A, Vanderlinde, K, Crawford, TM, de Haan, T, Dudley, JP, Shaw, L, Ade, PAR, Aird, KA, Benson, BA, Bleem, LE, Brodwin, M, Carlstrom, JE, Chang, CL, Crites, AT, Desai, S, Dobbs, MA, Foley, RJ, George, EM, Gladders, MD, Hall, NR, Halverson, NW, High, FW, Holder, GP, Holzapfel, WL, Hrubes, JD, Joy, M, Keisler, R, Knox, L, Lee, AT, Leitch, EM, Loehr, A, Lueker, M, Marrone, DP, McMahon, JJ, Mehl, J, Meyer, SS, Mohr, JJ, Montroy, TE, Ngeow, C-C, Padin, S, Plagge, T, Pryke, C, Reichardt, CL, Rest, A, Ruel, J, Ruhl, JE, Schaffer, KK, Shirokoff, E, Song, J, Spieler, HG, Stalder, B, Staniszewski, Z, Stark, AA, Stubbs, CW, van Engelen, A, Vieira, JD, Williamson, R, Yang, Y, Zahn, O, and Zenteno, A

Abstract

We present a detection-significance-limited catalog of 21 Sunyaev-Zel'dovich selected galaxy clusters. These clusters, along with 1 unconfirmed candidate, were identified in 178 deg^2 of sky surveyed in 2008 by the South Pole Telescope to a depth of 18 uK-arcmin at 150 GHz. Optical imaging from the Blanco Cosmology Survey (BCS) and Magellan telescopes provided photometric (and in some cases spectroscopic) redshift estimates, with catalog redshifts ranging from z=0.15 to z>1, with a median z = 0.74. Of the 21 confirmed galaxy clusters, three were previously identified as Abell clusters, three were presented as SPT discoveries in Staniszewski et al, 2009, and three were first identified in a recent analysis of BCS data by Menanteau et al, 2010; the remaining 12 clusters are presented for the first time in this work. Simulated observations of the SPT fields predict the sample to be nearly 100% complete above a mass threshold of M_200 ~ 5x10^14 M_sun/h at z = 0.6. This completeness threshold pushes to lower mass with increasing redshift, dropping to ~4x10^14 M_sun/h at z=1. The size and redshift distribution of this catalog are in good agreement with expectations based on our current understanding of galaxy clusters and cosmology. In combination with other cosmological probes, we use the cluster catalog to improve estimates of cosmological parameters. Assuming a standard spatially flat wCDM cosmological model, the addition of our catalog to the WMAP 7-year analysis yields sigma_8 = 0.81 +- 0.09 and w = -1.07 +- 0.29, a ~50% improvement in precision on both parameters over WMAP7 alone.

Published
2010

13. Dusty starburst galaxies in the early Universe as revealed by gravitational lensing.

Author

Vieira JD, Marrone DP, Chapman SC, De Breuck C, Hezaveh YD, Weiβ A, Aguirre JE, Aird KA, Aravena M, Ashby ML, Bayliss M, Benson BA, Biggs AD, Bleem LE, Bock JJ, Bothwell M, Bradford CM, Brodwin M, Carlstrom JE, Chang CL, Crawford TM, Crites AT, de Haan T, Dobbs MA, Fomalont EB, Fassnacht CD, George EM, Gladders MD, Gonzalez AH, Greve TR, Gullberg B, Halverson NW, High FW, Holder GP, Holzapfel WL, Hoover S, Hrubes JD, Hunter TR, Keisler R, Lee AT, Leitch EM, Lueker M, Luong-Van D, Malkan M, McIntyre V, McMahon JJ, Mehl J, Menten KM, Meyer SS, Mocanu LM, Murphy EJ, Natoli T, Padin S, Plagge T, Reichardt CL, Rest A, Ruel J, Ruhl JE, Sharon K, Schaffer KK, Shaw L, Shirokoff E, Spilker JS, Stalder B, Staniszewski Z, Stark AA, Story K, Vanderlinde K, Welikala N, and Williamson R

Abstract

In the past decade, our understanding of galaxy evolution has been revolutionized by the discovery that luminous, dusty starburst galaxies were 1,000 times more abundant in the early Universe than at present. It has, however, been difficult to measure the complete redshift distribution of these objects, especially at the highest redshifts (z > 4). Here we report a redshift survey at a wavelength of three millimetres, targeting carbon monoxide line emission from the star-forming molecular gas in the direction of extraordinarily bright millimetre-wave-selected sources. High-resolution imaging demonstrates that these sources are strongly gravitationally lensed by foreground galaxies. We detect spectral lines in 23 out of 26 sources and multiple lines in 12 of those 23 sources, from which we obtain robust, unambiguous redshifts. At least 10 of the sources are found to lie at z > 4, indicating that the fraction of dusty starburst galaxies at high redshifts is greater than previously thought. Models of lens geometries in the sample indicate that the background objects are ultra-luminous infrared galaxies, powered by extreme bursts of star formation.

Published
2013
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14. A massive, cooling-flow-induced starburst in the core of a luminous cluster of galaxies.

Author

McDonald M, Bayliss M, Benson BA, Foley RJ, Ruel J, Sullivan P, Veilleux S, Aird KA, Ashby ML, Bautz M, Bazin G, Bleem LE, Brodwin M, Carlstrom JE, Chang CL, Cho HM, Clocchiatti A, Crawford TM, Crites AT, de Haan T, Desai S, Dobbs MA, Dudley JP, Egami E, Forman WR, Garmire GP, George EM, Gladders MD, Gonzalez AH, Halverson NW, Harrington NL, High FW, Holder GP, Holzapfel WL, Hoover S, Hrubes JD, Jones C, Joy M, Keisler R, Knox L, Lee AT, Leitch EM, Liu J, Lueker M, Luong-Van D, Mantz A, Marrone DP, McMahon JJ, Mehl J, Meyer SS, Miller ED, Mocanu L, Mohr JJ, Montroy TE, Murray SS, Natoli T, Padin S, Plagge T, Pryke C, Rawle TD, Reichardt CL, Rest A, Rex M, Ruhl JE, Saliwanchik BR, Saro A, Sayre JT, Schaffer KK, Shaw L, Shirokoff E, Simcoe R, Song J, Spieler HG, Stalder B, Staniszewski Z, Stark AA, Story K, Stubbs CW, Suhada R, van Engelen A, Vanderlinde K, Vieira JD, Vikhlinin A, Williamson R, Zahn O, and Zenteno A

Abstract

In the cores of some clusters of galaxies the hot intracluster plasma is dense enough that it should cool radiatively in the cluster's lifetime, leading to continuous 'cooling flows' of gas sinking towards the cluster centre, yet no such cooling flow has been observed. The low observed star-formation rates and cool gas masses for these 'cool-core' clusters suggest that much of the cooling must be offset by feedback to prevent the formation of a runaway cooling flow. Here we report X-ray, optical and infrared observations of the galaxy cluster SPT-CLJ2344-4243 (ref. 11) at redshift z = 0.596. These observations reveal an exceptionally luminous (8.2 × 10(45) erg s(-1)) galaxy cluster that hosts an extremely strong cooling flow (around 3,820 solar masses a year). Further, the central galaxy in this cluster appears to be experiencing a massive starburst (formation of around 740 solar masses a year), which suggests that the feedback source responsible for preventing runaway cooling in nearby cool-core clusters may not yet be fully established in SPT-CLJ2344-4243. This large star-formation rate implies that a significant fraction of the stars in the central galaxy of this cluster may form through accretion of the intracluster medium, rather than (as is currently thought) assembling entirely via mergers.

Published
2012
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