Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-23
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20010119
We present BeppoSAX results of a spatially resolved spectral analysis of A3571, a relaxed nearby cluster of galaxies. In the central 2' (130/h_50 kpc) radius the metal abundance is 0.49 +- 0.08 solar and the absorption (1.13 +-0.28) x 10^21 atom/cm^2 whereas elsewhere within an 8'(520/h_50 kpc) radius the abundance is 0.32 \+- 0.05 solar and the absorption consistent with the galactic value of 4.4 x 10^20 atom/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 +- 40 M_Sun/yr from our spectral fit. The BeppoSAX and ASCA radial temperature profiles agree over the entire overlapping radial range r < 25' = 1.6/h_50 Mpc. The combined BeppoSAX and ASCA temperature profile exhibits a constant value out to a radius of 10' (650/h_50 kpc) and a significant decrease (T propto r^-0.55, corresponding to gamma=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 r_178 (2.5/h_50 Mpc) are 9.1+3.6-1.5 x 10^14 h_50^-1 M_Sun, by a factor of 1.4 smaller than the isothermal value. The gas mass fraction increases with radius, reaching f_gas(r_178) = 0.26+0.05-0.10 x h_50^-3/2. Assuming that the measured gas mass fraction is the lower limit to the primordial baryonic fraction gives Omega_m < 0.4 at 90% confidence.
Colafrancesco Sergio
Kaastra Jelle
Markevitch Maxim
Mazzotta Pasquale
Nevalainen Jukka
No associations
LandOfFree
Temperature and total mass profiles of the A3571 cluster of galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Temperature and total mass profiles of the A3571 cluster of galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature and total mass profiles of the A3571 cluster of galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-2469