C.D.S. - SIMBAD4 rel 1.7 - 2020.01.20CET15:29:49

2019A&A...622A.136H - Astronomy and Astrophysics, volume 622A, 136-136 (2019/2-1)

First detection of a virial shock with SZ data: implication for the mass accretion rate of Abell 2319.


Abstract (from CDS):

Shocks produced by the accretion of infalling gas in the outskirts of galaxy clusters are expected in the hierarchical structure formation scenario, as found in cosmological hydrodynamical simulations. Here, we report the detection of a shock front at a large radius in the pressure profile of the galaxy cluster A2319 at a significance of 8.6σ, using Planck thermal Sunyaev-Zel'dovich data. The shock is located at (2.93±0.05)xR500 and is not dominated by any preferential radial direction. Using a parametric model of the pressure profile, we derive a lower limit on the Mach number of the infalling gas, M>3.25 at 95% confidence level. These results are consistent with expectations derived from hydrodynamical simulations. Finally, we use the shock location to constrain the accretion rate of A2319 to M≥(1.4±0.4)x1014M/Gyr for a total mass of M200≥1015M.

Abstract Copyright: © ESO 2019

Journal keyword(s): cosmic background radiation - galaxies: clusters: intracluster medium - galaxies: clusters: individual: A2319

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4129 2
2 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 410 1

    Equat.    Gal    SGal    Ecl

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