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J/ApJ/792/45   SPT-SZ survey galaxy clusters optical spectroscopy  (Ruel+, 2014)

Optical spectroscopy and velocity dispersions of galaxy clusters from the SPT-SZ survey. Ruel J., Bazin G., Bayliss M., Brodwin M., Foley R.J., Stalder B., Aird K.A., Armstrong R., Ashby M.L.N., Bautz M., Benson B.A., Bleem L.E., Bocquet S., Carlstrom J.E., Chang C.L., Chapman S.C., Cho H.M., Clocchiatti A., Crawford T.M., Crites A.T., De Haan T., Desai S., Dobbs M.A., Dudley J.P., Forman W.R., George E.M., Gladders M.D., Gonzalez A.H., Halverson N.W., Harrington N.L., High F.W., Holder G.P., Holzapfel W.L., Hrubes J.D., Jones C., Joy M., Keisler R., Knox L., Lee A.T., Leitch E.M., Liu J., Lueker M., Luong-Van D., Mantz A., Marrone D.P., McDonald M., McMahon J.J., Mehl J., Meyer S.S., Mocanu L., Mohr J.J., Montroy T.E., Murray S.S., Natoli T., Nurgaliev D., Padin S., Plagge T., Pryke C., Reichardt C.L., Rest A., Ruhl J.E., Saliwanchik B.R., Saro A., Sayre J.T., Schaffer K.K., Shaw L., Shirokoff E., Song J., Suhada R., Spieler H.G., Stanford S.A., Staniszewski Z., Starsk A.A., Story K., Stubbs C.W., van Engelen A., Vanderlinde K., Vieira J.D., Vikhlinin A., Williamson R., Zahn O., Zenteno A. <Astrophys. J., 792, 45 (2014)> =2014ApJ...792...45R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Spectroscopy ; Redshifts ; Surveys Keywords: catalogs - galaxies: clusters: general 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 (≲ 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 ∼30% log-normal scatter in dispersion at fixed mass, and a ∼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. Description: Most of the galaxy clusters for which we report spectroscopic observations were published as SPT cluster detections (and new discoveries) in Vanderlinde et al. (2010ApJ...722.1180V), Williamson et al. (2011ApJ...738..139W), and Reichardt et al. (2013, J/ApJ/763/127); we refer the reader to those publications for details of the SPT observations. The spectroscopic observations presented in this work are the first of our ongoing follow-up program. The data were taken from 2008 to 2012 using the Gemini Multi Object Spectrograph (GMOS; Hook et al. 2004PASP..116..425H) on Gemini South, the Focal Reducer and low dispersion Spectrograph (FORS2; Appenzeller et al. 1998Msngr..94....1A) on VLT Antu, the Inamori Magellan Areal Camera and Spectrograph (IMACS; Dressler et al. 2006SPIE.6269E..0FD) on Magellan Baade, and the Low Dispersion Survey Spectrograph (LDSS339; Allington-Smith et al. 1994PASP..106..983A) on Magellan Clay. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 64 75 SPT Properties and Source of Spectroscopic Data table3.dat 84 2070 Galaxy redshifts table4.dat 64 61 Cluster Redshifts and Velocity Dispersions
See also: J/A+AS/129/399 : The ENACS Catalogue. V. (Katgert+ 1998) J/ApJ/742/48 : Blanco survey of the lens BCS J2352-5452 (Buckley-Geer+, 2011) J/ApJ/763/127 : Galaxy clusters discovered in the SPT survey (Reichardt+, 2013) J/ApJ/772/25 : Massive SZE clusters observations with ACT (Sifon+, 2013) J/ApJ/774/23 : Chandra observations of SPT-SZ clusters (McDonald+, 2013) J/ApJS/216/27 : Galaxy clusters discovered in the SPT-SZ survey (Bleem+, 2015) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [SPT-CL] 8- 17 A10 --- SPT-CL SPT identifier of associated cluster (G1) 18- 19 A2 --- n_SPT-CL [* **] Note on SPT-CL (2) 21- 28 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000) 30- 37 F8.4 deg DEdeg Declination in decimal degrees (J2000) 39- 43 F5.3 --- z Redshift 45- 49 F5.2 --- Signi ? SPT detection significance 51- 55 F5.2 10+14Msun M500cSPT ? SPT cluster mass estimate (in 10+14Msun/h70) (3) 57- 60 F4.2 10+14Msun e_M500cSPT ? Error on M500cSPT 62 A1 --- Work [Y ] Source of spectroscopy in this work 64 I1 --- Lit [1/6]? Source of spectroscopy in literature (4)
Note (2): Flag as follows : ** = clusters are reported here as SPT detections for the first time; * = clusters are new discoveries. Note (3): Marginalized over cosmological parameters as in Reichardt et al. (2013, J/ApJ/763/127), for those clusters at z >or= 0.3, except for two, as described in Section 2.1. Note (4): References as follows : 1 = Sifon et al. 2013, J/ApJ/772/25; 2 = Girardi et al. 1996ApJ...457...61G; 3 = Struble & Rood 1999ApJS..125...35S; 4 = Barrena et al. 2002A&A...386..816B; 5 = Katgert et al. 1998, J/A+AS/129/399; 6 = Buckley-Geer et al. 2011, J/ApJ/742/48.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [SPT-CL] 8- 17 A10 --- SPT-CL SPT identifier of associated cluster (G1) 19- 37 A19 --- Galaxy Galaxy designation (2) 39- 48 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 50- 59 F10.6 deg DEdeg Declination in decimal degrees (J2000) 61- 66 F6.4 --- z Redshift 68- 73 F6.4 --- e_z Error in z 75- 82 A8 --- Method Redshift fitting method (3) 84 I1 --- Spectral [1/7] Main spectral features (4)
Note (2): In the format (J2000; truncated coordinates). Note (3): Method as follows: rvsao-xc = RVSAO (routine "xcsao") cross-correlation with absorption spectrum; rvsao-em = RVSAO (routine "emsao') fit to emission lines; template = In-house chi2-minimization SDSS template fitting. Note (4): Main spectral features as follows: 1 = Ca II H&K 2 = O II emission 4 = Other emission 3 = Ca II H&K and O II emission 5 = Ca II H&K and other emission 6 = O II emission and other emission 7 = O II emission, Ca II H&K and other emission
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [SPT-CL] 8- 17 A10 --- SPT-CL SPT identifier of associated cluster (G1) 19- 20 A2 --- n_SPT-CL [*abcde ] Note on SPT-CL (1) 22- 23 I2 --- N [3/78] Number of spectroscopic members as determined by iterative 3σ clipping 25- 27 F3.1 --- ApRad ? Aperture radius within which members were sampled in units of R200c,SPT 29- 34 F6.4 --- z Robust biweight average redshift 36- 41 F6.4 --- e_z Uncertainty in z 43- 46 I4 km/s sigmaSPT ? The "equivalent dispersion" calculated from the SZ-based SPT mass σSPT (see Section 3.2.1) 48- 51 I4 km/s sigmaG ? The measured gapper scale 53- 55 I3 km/s e_sigmaG ? Uncertainty in sigmaG 57- 60 I4 km/s sigmaBI ? Biweight dispersion 62- 64 I3 km/s e_sigmaBI ? Uncertainty in sigmaBI
Note (1): Note as follows: * = Indicates potentially less reliable dispersion measurements (see Section 3.2); a = For SPT-CL J0205-5829, see also Stalder et al. (2013ApJ...763...93S); b = For SPT-CL J0546-5345, see also Brodwin et al. (2010ApJ...721...90B); c = For SPT-CL J2040-4451, see also Bayliss et al. (2013, arXiv:1307.2903); d = For SPT-CL J2106-5844, see also Foley et al. (2011ApJ...731...86F); e = For SPT-CL J2344-4243, see also McDonald et al. (2012Natur.488..349M).
Global notes: Note (G1): In the format SPT-CL Jhhmm+ddmm (J2000; truncated coordinates).
History: * 07-Apr-2017: From electronic version of the journal * 19-Sep-2017: table4 added
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Apr-2017
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