2007ApJ...660.1137M

Query : 2007ApJ...660.1137M

2007ApJ...660.1137M - Astrophys. J., 660, 1137-1145 (2007/May-2)

Creation of X-ray cavities in galaxy clusters with cosmic rays.

MATHEWS W.G. and BRIGHENTI F.

Abstract (from CDS):

We describe how AGN-produced cosmic rays form large X-ray cavities and radio lobes in the hot diffuse gas in galaxy groups and clusters. Cosmic rays are assumed to be produced in a small shocked region near the cavity center, such as at the working surface of a radio jet. The coupled equations for gas dynamics and cosmic ray diffusion are solved with various assumptions about the diffusion coefficient. To form large, long-lived cavities similar to those observed, the diffusion coefficient must not exceed κ∼10²⁸ cm2/s in the hot gas, very similar to values required in models of cosmic ray diffusion in the Milky Way. When κ≲10²⁸ cm2/s, cosmic rays are confined within the cavities for times comparable to the cavity buoyancy time, as implied by observations of X-ray cavities and their radio synchrotron emission. Collisions of proton cosmic rays with thermal plasma nuclei followed by π⁰-decays can result in enhanced gamma-ray emission from the cavity walls.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Cooling Flows - Galaxies: Clusters: General - X-Rays: Galaxies - X-Rays: Galaxies: Clusters

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	ACO 780	ClG	09 18 30	-12 15.7						~	469	0

Query : 2007ApJ...660.1137M

Basic data :

ACO 780 -- Cluster of Galaxies
Other object types:	`ClG (2014MNRAS,ACO,...)`, `gLe (2016MNRAS)`, `X (1H)`
ICRS coord. (ep=J2000) :	`09 18 30.0 -12 15 42 [ 150000 150000 90 ] E 1989ApJS...70....1A`
FK4 coord. (ep=B1950 eq=1950) :	`09 16 05.6 -12 03 02 [ 150000 150000 90 ]`
Gal coord. (ep=J2000) :	`243.1375 +25.0686 [ 150000 150000 90 ]`
Radial velocity / Redshift / cz :	`V(km/s) 15241 [~] / z(~) 0.052200 [~] / cz 15649.17 [~] D 1987ApJS...63..543S`

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`ACO 780`	`1H 0917-121`	`NAME Hydra A Cluster`
`BAX 139.6265-12.2611`	`NAME Hya A Cluster`

References (469 between 1850 and 2026) (Total 469)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : ACO 780

Link by name to the catalogue in VizieR :

ACO 780

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