2010MNRAS.408.1277S

Query : 2010MNRAS.408.1277S

2010MNRAS.408.1277S - Mon. Not. R. Astron. Soc., 408, 1277-1282 (2010/October-3)

Mass discrepancy in galaxy clusters as a result of the offset between dark matter and baryon distributions.

SHAN H.Y., QIN B. and ZHAO H.S.

Abstract (from CDS):

Recent studies of lensing clusters reveal that it might be fairly common for a galaxy cluster that the X-ray centre has an obvious offset from its gravitational centre which is measured by strong lensing. We argue that if these offsets exist, then X-rays and lensing are indeed measuring different regions of a cluster, and may thus naturally result in a discrepancy in the measured gravitational masses by the two different methods. Here we investigate theoretically the dynamical effects of such lensing-X-ray offsets and compare with observational data. We find that for typical values, the offset alone can give rise to a factor of 2 difference between the lensing and X-ray-determined masses for the core regions of a cluster, suggesting that such `offset effect' may play an important role and should not be ignored in our dynamical measurements of clusters.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): gravitational lensing: strong - dark matter - X-rays: galaxies: clusters

Simbad objects: 28

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Number of rows : 28
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 68 ClG 00 37 06.2 +09 09 33           ~ 195 0
3 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 241 0
4 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 825 0
5 ClG 0440+02 ClG 04 43 09.7 +02 10 19     17.03     ~ 129 0
6 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 368 0
7 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
8 PKS 0745-19 rG 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 422 1
9 ClG 0745-1910 ClG 07 47 32.4 -19 18 23           ~ 378 0
10 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
11 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 308 0
12 ClG 1008-12 ClG 10 10 34.1 -12 39 48     18.0     ~ 155 0
13 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
14 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
15 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 577 0
16 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
17 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
18 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
19 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
20 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
21 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
22 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
23 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
24 ACO 2259 ClG 17 20 09.2 +27 40 09           ~ 131 0
25 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
26 ClG 2053-04 ClG 20 56 21.2 -04 37 46   21.0       ~ 168 0
27 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 390 0
28 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2

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