2014A&A...561A..52V


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET21:21:39

2014A&A...561A..52V - Astronomy and Astrophysics, volume 561A, 52-52 (2014/1-1)

Spectral index image of the radio halo in the cluster Abell 520, which hosts the famous bow shock.

VACCA V., FERETTI L., GIOVANNINI G., GOVONI F., MURGIA M., PERLEY R.A. and CLARKE T.E.

Abstract (from CDS):

Synchrotron-radio emission has been detected from an increasing number of galaxy clusters. Spectral index images are a powerful tool for investigating the origin and nature of these sources, and their connection with the dynamical state of the cluster. The aim of this work is to investigate the spectral index distribution of the radio halo in the galaxy cluster A520, known to be a complex system from an optical, radio, and X-ray point of view. We present deep Very Large Array observations in total intensity at 325 and 1400 MHz. We produced and analyzed spectral index images of the radio halo in this frequency range at a resolution of 39'' and 60'' and determined possible correlations with the thermal properties of the cluster. We found an integrated radio-halo spectral index α3251400∼1.12. No strong radial steepening is present and the spectral index distribution is intrinsically complex with fluctuations only partially due to measurement errors. The radio-halo-integrated spectral index and the cluster temperature follow the general trend observed in other galaxy clusters, although a strong point-to-point correlation between the spectral index and the thermal gas temperature has not been observed. The complex morphology in the spectral index image of the radio halo in A520 agrees with the primary models for radio-halo formation. The flatness of the radial profile suggests that the merger is still ongoing and is uniformly and continuously (re-) accelerating the population of relativistic electrons responsible of the radio emission even at large (∼1Mpc) distances from the cluster center.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 520 - magnetic fields - large-scale structure of Universe

Simbad objects: 25

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Number of rows : 25

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 2744 ClG 00 14 20.03 -30 23 17.8           ~ 541 0
2 ACO 520 ClG 04 54 19.0 +02 56 49           ~ 372 0
3 ICRF J050321.1+020304 Sy2 05 03 21.19717510 +02 03 04.6763382   22.500 21.350 20.682   ~ 170 1
4 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 726 1
5 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1234 1
6 1RXS J060314.8+421439 X 06 03 14.801 +42 14 39.48           ~ 18 0
7 ClG J0603.3+4214 ClG 06 03.3 +42 14           ~ 60 0
8 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 777 1
9 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 332 0
10 B3 0714+378 Rad 07 17 36.50 +37 45 23.0           ~ 169 2
11 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 396 0
12 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 206 0
13 ACO 754 ClG 09 08 50.1 -09 38 12           ~ 628 1
14 ACO 1240 ClG 11 23 32 +43 06.5           ~ 71 0
15 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4106 2
16 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 279 1
17 ACO 1914 ClG 14 26 01.3 +37 49 36           ~ 267 0
18 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 133 0
19 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 512 0
20 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 309 0
21 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 822 1
22 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 493 0
23 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 410 1
24 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 556 1
25 NAME Sausage Cluster ClG 22 42 53.0 +53 01 05           ~ 146 0

    Equat.    Gal    SGal    Ecl

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2019.11.14-21:21:39

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