2008A&A...481L..91P

Query : 2008A&A...481L..91P

2008A&A...481L..91P - Astronomy and Astrophysics, volume 481, L91-94 (2008/4-3)

Detection of diffuse radio emission at large distance from the center of the galaxy cluster A2255.

PIZZO R.F., DE BRUYN A.G., FERETTI L. and GOVONI F.

Abstract (from CDS):

Low-frequency radio observations of galaxy clusters are the key to detecting the diffuse extended emission associated with them. The presence and properties of such radio sources in galaxy clusters reveal the existence of magnetic fields on a large scale and allow theories to be tested concerning both the origin of relativistic particles in the ICM and their propagation.A deep radio observation of the A2255 galaxy cluster was carried out at 85 cm with the WSRT. The good UV-coverage and sensitivity achieved by these observations allowed us to image the complex structure of the low-brightness, extended cluster sources (radio halo and relic). These sources show a larger extent than what has been imaged so far at this frequency, with two new structures located SW and NW of the cluster center and at projected distances of 2Mpc from it.The physical properties of the newly detected structures, together with the active dynamical state of the cluster, support a connection with large-scale structure (LSS) formation shocks.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 2255 - galaxies: intergalactic medium - radio continuum: general

Nomenclature: Fig.1, text: [PDF2008] AN (Nos A-B, A1-A2).

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 909 0
2 ACO 3367 ClG 05 49 21 -24 28.1           ~ 31 0
3 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 305 0
4 NAME 0917+75 Relic rG 09 22 11.400 +74 59 31.00           ~ 15 0
5 3C 295 Sy2 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 979 5
6 ACO 2069 ClG 15 24 02.92 +29 53 20.3           ~ 143 0
7 [PDF2008] B Rad 17 10.1 +63 47           ~ 1 1
8 [PDF2008] A2 Rad 17 10.7 +64 22           ~ 1 1
9 [PDF2008] A Rad 17 11.2 +64 26           ~ 1 1
10 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 568 0
11 NAME Beaver Galaxy rG 17 13 16.0032670728 +63 47 37.537544544           ~ 33 1
12 NAME Embryo Galaxy rG 17 15 09.0821100936 +64 02 53.508940656           ~ 26 1
13 NAME Bean Galaxy BiC 17 15 30.0400474176 +64 39 51.605504244           ~ 23 1
14 WN B1717.1+6404 Rad 17 17 28.53 +64 01 17.0           ~ 1 0
15 4C 64.21 AG? 17 19 59.6108 +64 04 37.152           ~ 9 1
16 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 627 1
17 [PDF2008] A1 Rad ~ ~           ~ 1 1

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