2005A&A...440..867G


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET04:46:46

2005A&A...440..867G - Astronomy and Astrophysics, volume 440, 867-879 (2005/9-4)

Spectral properties and origin of the radio halo in A3562.

GIACINTUCCI S., VENTURI T., BRUNETTI G., BARDELLI S., DALLACASA D., ETTORI S., FINOGUENOV A., RAO A.P. and ZUCCA E.

Abstract (from CDS):

We present a new detailed multiband study of the merging cluster A3562, in the core of the Shapley Concentration Supercluster. We analyzed new, low frequency radio data performed at 240MHz, 332MHz and 610MHz with the Giant Metrewave Radio Telescope (GMRT). The new GMRT data allowed us to carry out a detailed study of the radio halo at the centre of A3562, as well as of the head-tail radio galaxy J1333-3141 embedded in it, and of the extended emission around the peripheral cluster galaxy J1332-3146a. Thanks to the present observations we could derive the integrated spectrum of the radio halo with five data points in the frequency range 240MHz-1.4GHz. Our data show a clear steepening of the total spectrum in this frequency range. Furthermore, by comparing the GMRT 332MHz image with a previously published VLA 1.4GHz image, we produced an image of the halo spectral index distribution. The image shows a very complex structure, with an average value of α1.4GHz332MHz∼1.5 and a number of knots steepening up to ∼2. We performed a combined morphological and statistical analysis using the radio images and the quantities derived from XMM-Newton and Chandra observations. We discuss our results in the light of particle re-acceleration processes in galaxy clusters. In particular, we outline an overall picture, consistent with the available radio and X-ray data, in which the cluster merger kinematics, the injection of turbulence and B-amplification induced by the merger between A3562 and SC1329-313 are jointly taken into account.

Abstract Copyright:

Journal keyword(s): radio continuum: general - X-rays: galaxies: clusters - galaxies: clusters: individual: A3562

CDS comments: Paragraph 2.secondary phase calibrators 1248-199 and 1311-222 not identified.

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 - 2021
#notes
1 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1301 1
2 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 825 1
3 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 516 0
4 ACO 3556 ClG 13 24 06.2 -31 39 38           ~ 140 0
5 ACO 3558 ClG 13 27 54.8 -31 29 32           ~ 409 2
6 [BZM96] 8 ClG 13 29 47 -31 36.5           ~ 59 1
7 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3840 2
8 BAX 202.9000-31.8128 ClG 13 31 36 -31 48.8           ~ 69 1
9 2MASX J13320334-3146430 BiC 13 32 03.141 -31 46 48.40   15.65   13.99   ~ 25 0
10 2MASX J13333164-3140589 rG 13 33 31.641 -31 40 58.91   17.33   15.39   ~ 11 0
11 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 286 1
12 NAME ACO 3558 Complex SCG ~ ~           ~ 10 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-04:46:46

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