The Atacama Cosmology Telescope: dynamical masses for 44 SZ-selected galaxy clusters over 755 square degrees

被引:36
作者
Sifon, Cristobal [1 ,2 ]
Battaglia, Nick [3 ]
Hasselfield, Matthew [3 ,4 ]
Menanteau, Felipe [5 ,6 ]
Felipe Barrientos, L. [7 ]
Bond, J. Richard [8 ]
Crichton, Devin [9 ]
Devlin, Mark J. [10 ]
Dunner, Rolando [7 ]
Hilton, Matt [11 ]
Hincks, Adam D. [12 ,13 ]
Hlozek, Renee [3 ]
Huffenberger, Kevin M. [14 ]
Hughes, John P. [1 ,15 ]
Infante, Leopoldo [7 ]
Kosowsky, Arthur [16 ]
Marsden, Danica [10 ]
Marriage, Tobias A. [9 ]
Moodley, Kavilan [11 ]
Niemack, Michael D. [17 ]
Page, Lyman A. [18 ]
Spergel, David N. [3 ]
Staggs, Suzanne T. [18 ]
Hy Trac [19 ]
Wollack, Edward J. [20 ]
机构
[1] Gemini South Observ, Hilo, HI 96720 USA
[2] Leiden Univ, Leiden Observ, POB 513, NL-2300 RA Leiden, Netherlands
[3] Princeton Univ, Dept Astrophys Sci, Peyton Hall, Princeton, NJ 08544 USA
[4] Penn State Univ, Dept Astron & Astrophys, Davey Lab, 525 Davey Lab, University Pk, PA 16802 USA
[5] Univ Illinois, Natl Ctr Supercomp Applicat, 1205 W Clark St, Urbana, IL 61801 USA
[6] Univ Illinois, Dept Astron, 1002 W Green St, Urbana, IL 61801 USA
[7] Pontificia Univ Catolica, Fac Fis, Inst Astrofis, Casilla 306, Santiago 22, Chile
[8] Canadian Inst Theoret Astrophys, 60 St George, Toronto, ON M5S 3H8, Canada
[9] Johns Hopkins Univ, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA
[10] Univ Penn, Dept Phys & Astron, 209 South 33rd St, Philadelphia, PA 19104 USA
[11] Univ KwaZulu Natal, Sch Math Stat & Comp Sci, Astrophys & Cosmol Res Unit, ZA-4041 Durban, South Africa
[12] Univ British Columbia, Dept Phys & Astron, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada
[13] Pontificia Univ Gregoriana, Piazza Pilotta 4, I-00187 Rome, Italy
[14] Florida State Univ, Dept Phys, POB 3064350, Tallahassee, FL 32306 USA
[15] Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA
[16] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
[17] Cornell Univ, Dept Phys, Ithaca, NY 14853 USA
[18] Princeton Univ, Joseph Henry Labs Phys, Jadwin Hall, Princeton, NJ 08544 USA
[19] Carnegie Mellon Univ, Dept Phys, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA
[20] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
基金
美国国家科学基金会; 欧洲研究理事会; 加拿大创新基金会;
关键词
galaxies: clusters: general; Galaxies: distances and redshifts; cosmology: observations; large-scale structure of Universe; WEAK-LENSING ANALYSIS; ACT-CL J0102-4915; SUNYAEV-ZELDOVICH; X-RAY; SCALING RELATIONS; VELOCITY DISPERSIONS; SPECTROSCOPIC OBSERVATIONS; PHYSICAL-PROPERTIES; RICH CLUSTERS; EL GORDO;
D O I
10.1093/mnras/stw1284
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present galaxy velocity dispersions and dynamical mass estimates for 44 galaxy clusters selected via the Sunyaev-Zel'dovich (SZ) effect by the Atacama Cosmology Telescope. Dynamical masses for 18 clusters are reported here for the first time. Using N-body simulations, we model the different observing strategies used to measure the velocity dispersions and account for systematic effects resulting from these strategies. We find that the galaxy velocity distributions may be treated as isotropic, and that an aperture correction of up to 7 per cent in the velocity dispersion is required if the spectroscopic galaxy sample is sufficiently concentrated towards the cluster centre. Accounting for the radial profile of the velocity dispersion in simulations enables consistent dynamical mass estimates regardless of the observing strategy. Cluster masses M200 are in the range (1-15) x 10(14)M(circle dot). Comparing with masses estimated from the SZ distortion assuming a gas pressure profile derived from X-ray observations gives a mean SZ-to-dynamical mass ratio of 1.10 +/- 0.13, but there is an additional 0.14 systematic uncertainty due to the unknown velocity bias; the statistical uncertainty is dominated by the scatter in the mass-velocity dispersion scaling relation. This ratio is consistent with previous determinations at these mass scales.
引用
收藏
页码:248 / 270
页数:23
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