2001A&A...369..459N


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST17:24:58

2001A&A...369..459N - Astronomy and Astrophysics, volume 369, 459-466 (2001/4-2)

Temperature and total mass profiles of the A3571 cluster of galaxies.

NEVALAINEN J., KAASTRA J., PARMAR A.N., MARKEVITCH M., OOSTERBROEK T., COLAFRANCESCO S. and MAZZOTTA P.

Abstract (from CDS):

We present BeppoSAX results of a spatially resolved spectral analysis of A3571, a relaxed nearby cluster of galaxies. In the central 2' (130h50–1kpc) radius the metal abundance is 0.49±0.08 solar and the absorption (1.13±0.28)x1021atom/cm2, whereas elsewhere within an 8' (520h50–1kpc) radius the abundance is 0.32±0.05 solar and the absorption consistent with the galactic value of 4.4x1020atom/cm2. The significant central metal abundance enhancement is consistent with the supernova enrichment scenario. The excess absorption may be attributed to the cooling flow, whose mass flow rate is 80±40M/yr from our spectral fit. The BeppoSAX and ASCA radial temperature profiles agree over the entire overlapping radial range r<25'=1.6h50–1Mpc. The combined BeppoSAX and ASCA temperature profile exhibits a constant value out to a radius of ∼10' (650h50–1kpc) and a significant decrease (T∝r–0.55, corresponding to γ=1.28) at larger radii. These temperature data are used to derive the total mass profile. The best fit NFW dark matter density model results in a temperature profile that is not convectively stable, but the model is acceptable within the uncertainties of the data. The temperature profile is acceptably modeled with a ``core'' model for the dark matter density, consisting of a core radius with a constant slope at larger radii. With this model the total mass and formal 90% confidence errors within the virial radius r178 (2.5h50–1Mpc) are 9.1+3.6–1.5x1014h50–1M, by a factor of 1.4 smaller than the isothermal value. The gas mass fraction increases with radius, reaching fgas(r178)=0.26+0.05–0.10xh50–3/2. Assuming that the measured gas mass fraction is the lower limit to the primordial baryonic fraction gives Ωm<0.4 at 90% confidence.

Abstract Copyright:

Journal keyword(s): cosmology: observations - dark matter - X-rays: clusters of galaxies

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 520 0
2 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 372 0
3 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 663 2
4 ESO 383-76 BiC 13 47 28.385 -32 51 54.02   13.02   11.53   ~ 53 1
5 ACO 3571 ClG 13 47 28.9 -32 51 57           ~ 265 2
6 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 860 0
7 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1106 1
8 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 832 1
9 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 417 1

    Equat.    Gal    SGal    Ecl

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2020.10.24-17:24:58

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