2011A&A...530L...5G


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.17CET07:12:05

2011A&A...530L...5G - Astronomy and Astrophysics, volume 530, L5-5 (2011/6-1)

A giant radio halo in the low luminosity X-ray cluster Abell 523.

GIOVANNINI G., FERETTI L., GIRARDI M., GOVONI F., MURGIA M., VACCA V. and BAGCHI J.

Abstract (from CDS):

Radio halos are extended and diffuse non-thermal radio sources present at the cluster center, not obviously associated with any individual galaxy. A strong correlation has been found between the cluster X-ray luminosity and the halo radio power. We observe and analyze the diffuse radio emission present in the complex merging structure Abell 523, classified as a low luminosity X-ray cluster, to discuss its properties in the context of the halo total radio power versus X-ray luminosity correlation. We reduced VLA archive observations at 1.4GHz to derive a deep radio image of the diffuse emission, and compared radio, optical, and X-ray data. Low-resolution VLA images detect a giant radio halo associated with a complex merging region. The properties of this new halo agree with those of radio halos in general discussed in the literature, but its radio power is about a factor of ten higher than expected on the basis of the cluster X-ray luminosity. Our study of this giant radio source demonstrates that radio halos can also be present in clusters with a low X-ray luminosity. Only a few similar cases have so far been found. This result suggests that this source represents a new class of objects, that cannot be explained by classical radio halo models. We suggest that the particle reacceleration related to merging processes is very efficient and/or the X-ray luminosity is not a good indicator of the past merging activity of a cluster.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 523 - large-scale structure of the Universe

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 209 ClG 01 31 57.5 -13 34 35           ~ 240 0
2 ClG 0217+70 ClG 02 17 00.0 +70 36 00           ~ 18 0
3 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 508 0
4 ACO 523 ClG 04 59 01 +08 46.5           ~ 39 0
5 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 777 1
6 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 396 0
7 ACO 851 ClG 09 42 56.6 +46 59 22           ~ 305 0
8 ACO 1213 ClG 11 16 29.1 +29 15 37           ~ 144 0
9 ACO 1351 ClG 11 42 30.8 +58 32 20           ~ 62 0
10 ACO 2034 ClG 15 10 10.80 +33 30 21.6           ~ 171 1
11 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 774 1
12 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 493 0

    Equat.    Gal    SGal    Ecl

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2019.11.17-07:12:05

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