abell 2319 galaxy cluster Distance : 800 million light years (Robert.S)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg)

abell 2319 galaxy cluster Distance : 800 million light years, Robert.S

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abell 2319 galaxy cluster Distance : 800 million light years

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abell 2319 galaxy cluster Distance : 800 million light years

Abell 2319

Type of Object:

Galaxy Cluster

Coordinates:

Right Ascension: 19h 20m 45s ; Declination: +43° 57′ 43″

Constellation:

Cygnus the Swan

Distance of Object:

800 million light years

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

G. Hurier1, R. Adam1 and U. Keshet2

Received: 15 December 2017 Accepted: 12 December 2018

Abstract

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) × R500 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 Ṁ ≃ (1.4 ± 0.4) × 1014 M⊙ Gyr−1 for a total mass of M200 ≃ 1015 M⊙."

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