Query : 2004A&A...419..517G

2004A&A...419..517G - Astronomy and Astrophysics, volume 419, 517-525 (2004/5-4)

An X-ray review of MS 1054-0321: Hot or not?


Abstract (from CDS):

XMM-Newton observations are presented for the z=0.83 cluster of galaxies MS1054-0321, the highest redshift cluster in the Einstein Extended Medium Sensitivity Survey (EMSS). The temperature inferred by the XMM-Newton data, T=7.2+0.7–0.6keV, is much lower than the temperature previously reported from ASCA data, T=12.3+3.1–2.2keV (Donahue et al., 1998ApJ...502..550D), and a little lower than the Chandra temperature, T=10.4+1.7–1.5keV, determined by Jeltema et al. (2001ApJ...562..124J). The discrepancy between the newly derived temperature and the previously derived temperatures is discussed in detail. If one allows the column density to be a free parameter, then the best fit temperature becomes T=8.6+1.2–1.1keV, and the best fit column density becomes NH=1.33+0.15–0.14x1020atoms/cm2. The iron line is well detected in the XMM-Newton spectrum with a value for the abundance of Z=0.33+0.19–0.18Z, in very good agreement with previous determinations. The derived XMM X-ray luminosity for the overall cluster in the 2-10 keV energy band is LX=(3.81±0.19)x1044h–2erg/s while the bolometric luminosity is LBOL=(8.05±0.40)x1044h–2erg/s. The XMM-Newton data confirm the substructure in the cluster X-ray morphology already seen by ROSAT and in much more detail by Chandra. We find that only two of the three clumps detected in the weak lensing mass reconstruction image are visible in X-rays, as already noted by ???[jel01]. The central weak lensing clump is coincident with the main cluster component and has a temperature T=8.1+1.3–1.2keV. The western weak lensing clump coincides with the western X-ray component which is much cooler with a temperature T=5.6+0.8–0.6keV. The optically measured velocity dispersion, obtained from 145 cluster redshifts, is consistent with the velocity dispersion expected from the σV-TX relationship once the XMM-Newton temperature is used. MS1054-0321 fits well in the σ∝T1/2 correlation available in the literature and derived from information collected for all clusters at redshfits of z≤1.27 known today and with a measured X-ray temperature. The cluster temperature seems to be commensurate with the predictions from its X-ray luminosity from the LX-TX relation of local clusters. Given the newly determined temperature, MS1054-0321 is no longer amongst the hottest clusters known.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: MS1054-0321 - cosmology: dark matter - X-rays: galaxies: clusters - galaxies: intergalactic medium

Nomenclature: Fig.1, Table 2: [GBB2004] 1054-0321 N (Nos 1-3) = [GBB2004] JHHMMSS.s+DDMMSS N=2. Fig.1, Table 3: [GBB2004] JHHMMSS.s+DDMMSS N=1.

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 250 3
2 [GBB2004] J105656.6-033736 X 10 56 56.6 -03 37 36           ~ 1 1
3 [GBB2004] J105658.8-033852 X 10 56 58.8 -03 38 52           ~ 1 0
4 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 451 0
5 [GBB2004] J105700.3-033729 X 10 57 00.3 -03 37 29           ~ 1 1
6 ClG J1716+6708 ClG 17 16 49.6 +67 08 30           ~ 133 0
7 [GBB2004] 1054-0321 3 X ~ ~           ~ 1 0

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