2008A&A...487...75C

Query : 2008A&A...487...75C

2008A&A...487...75C - Astronomy and Astrophysics, volume 48775-87 (2008/8-3)

Cluster geometry and inclinations from deprojection uncertainties. Cluster geometry and inclination.

CHAKRABARTY D., DE FILIPPIS E. and RUSSELL H.

Abstract (from CDS):

The determination of cluster masses is a complex problem that would be aided by information about the cluster shape and orientation (with respect to the line-of-sight). It is in this context, that we have developed a scheme for identifying the intrinsic morphology and inclination of a cluster, by looking for the signature of the true cluster characteristics in the inter-comparison of the different deprojected emissivity profiles (that all project to the same X-ray brightness distribution) and complimenting this with SZe data when available. We deproject the cluster X-ray surface brightness profile under assumptions about geometry and inclination that correspond to four extreme scenarios; the deprojection is performed by the non-parametric algorithm DOPING. The formalism is tested with model clusters and is then applied to a sample of 24 clusters. While the shape determination is possible by implementing the X-ray brightness alone, the estimation of the inclination is usually markedly improved upon by the usage of SZe data that is available for the considered sample. We spot 8 prolate systems, 1 oblate and 15 of the clusters in our sample as triaxial. In fact, for systems identified as triaxial, we are able to discern how the three semi-axis lengths compare with each other. This, when compounded by the information about the line-of-sight extent, allows us to constrain the intrinsic axial ratios and the inclination quite tightly.

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Journal keyword(s): methods: analytical - galaxies: clusters: general

Simbad objects: 25

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Number of rows : 25
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 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 825 0
3 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 420 0
4 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
5 ACO 478 ClG 04 13 24.8 +10 27 52           ~ 522 0
6 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
7 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 368 0
8 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
9 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 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 1137+66 ClG 11 40 23.0 +66 08 16     21.0     ~ 141 0
13 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 456 0
14 ACO 1651 ClG 12 59 27.3 -04 10 49           ~ 307 0
15 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
16 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
17 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 577 0
18 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
19 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
20 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
21 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
22 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
23 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
24 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
25 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0

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