2016ApJ...830..109S

Query : 2016ApJ...830..109S

2016ApJ...830..109S - Astrophys. J., 830, 109-109 (2016/October-3)

On escaping a galaxy cluster in an accelerating universe.

STARK A., MILLER C.J. and GIFFORD D.

Abstract (from CDS):

We derive the escape velocity profile for an Einasto density field in an accelerating universe and demonstrate its physical viability by comparing theoretical expectations to both light-cone data generated from N-body simulations and archival data on 20 galaxy clusters. We demonstrate that the projection function (g(β)) is deemed physically viable only for the theoretical expectation that includes a cosmology-dependent term. Using simulations, we show that the inferred velocity anisotropy is more than 6σ away from the expected value for the theoretical profile that ignores the acceleration of the universe. In the archival data, we constrain the average velocity anisotropy parameter of a sample of 20 clusters to be β=0.248–0.360+0.164 at the 68% confidence level. Lastly, we briefly discuss how our analytic model may be used as a novel cosmological probe based on galaxy clusters.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): cosmology: theory - galaxies: clusters: general - galaxies: clusters: general

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 648 1
2 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 241 0
3 ACO 383 ClG 02 48 03.3915 -03 31 45.228           ~ 389 0
4 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
5 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
6 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
7 ACO 1246 ClG 11 23 57.4 +21 29 14           ~ 118 0
8 MCS J1206.2-0847 ClG 12 06 12.2 -08 48 02           ~ 286 0
9 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
10 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
11 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 335 0
12 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
13 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
14 ACO 2111 ClG 15 39 40.9 +34 25 04           ~ 188 0
15 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
16 ClG 1621+26 ClG 16 23 35.7 +26 33 50           ~ 145 0
17 ACO 2259 ClG 17 20 09.2 +27 40 09           ~ 131 0
18 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
19 ClG J2129+0005 ClG 21 29 40.5 +00 05 47           ~ 308 0
20 ACO 2631 ClG 23 37 40.7 +00 16 35           ~ 183 0

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