2002A&A...387...56P


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET10:59:59

2002A&A...387...56P - Astronomy and Astrophysics, volume 387, 56-62 (2002/5-3)

SZ and X-ray combined analysis of a distant galaxy cluster, RX J2228+2037.

POINTECOUTEAU E., HATTORI M., NEUMANN D., KOMATSU E., MATSUO H., KUNO N. and BOEHRINGER H.

Abstract (from CDS):

We have performed a combined analysis of X-ray and Sunyaev-Zel'dovich data in the direction of the distant galaxy cluster, RX J2228+2037. Fitting a β-model to the high-resolution HRI data gives rc=103±12h70–1kpc and β=0.54±0.03. The dependency of the Sunyaev-Zel'dovich effect with respect to the gas temperature allows us, through the additional use of the 21 GHz data of the cluster, to determine kBTe=10.4±1.8h701/2keV. Extrapolating the gas density profile out to the virial radius (Rv=r178=2.9Mpc), we derived a gas mass of Mg(r<Rv)=(4.0±0.2)x1014h70–5/2M. Within the hypothesis of hydrostatic equilibrium, the corresponding extrapolated total mass for this source is: Mtot(r<Rv)=(1.8 ±0.4)x1015h–1M, which corresponds to a gas fraction of fgas=0.22±0.06h70–3/2. Our results on the temperature and on the cluster mass classify RX J2228+2037 among the distant, hot and very massive galaxy clusters. Our work highlights the power of the association of galaxy cluster mapping observations in X-ray and the SZ effect to derive the cluster's physical properties, even without X-ray spectroscopy.

Abstract Copyright:

Journal keyword(s): cosmology: observation - galaxies: clusters: individual: RX J2228+2037 - galaxies: intergalactic medium

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ClG J1347-1145 ClG 13 47 33.5 -11 45 42           ~ 479 0
2 1RXS J222834.4+203647 ClG 22 28 37.1 +20 36 31           ~ 103 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-10:59:59

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