2013A&A...557A.117P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST04:01:53

2013A&A...557A.117P - Astronomy and Astrophysics, volume 557A, 117-117 (2013/9-1)

Low-frequency radio emission in the massive galaxy cluster MCS J0717.5+3745.

PANDEY-POMMIER M., RICHARD J., COMBES F., DWARAKANATH K.S., GUIDERDONI B., FERRARI C., SIROTHIA S. and NARASIMHA D.

Abstract (from CDS):

To investigate the nonthermal emission mechanism and their interaction during cluster mergers, we analyze multiple low-frequency radio data for the X-ray luminous massive galaxy cluster MACS J0717.5+3745, located at z=0.5548. Large-scale structure-formation models in the Universe suggest that galaxy clusters grow via constant accretion of gas and the merger of galaxy groups and smaller clusters. Low-frequency radio observations trace these mergers in the form of relics and halos. The dual frequency observations were performed on MACS J0717.5+3745 to investigate the spectral index pattern of the nonthermal emission and its interaction within the intracluster medium (ICM), during merger process. Continuum observations were carried out using GMRT at 0.235 and 0.61GHz on MACS J0717.5+3745 and archival data from the VLA (0.074 and 1.42GHz) and WSRT (0.325GHz) was used to complement the results. Furthermore, to explore the thermal and nonthermal interactions within the ICM and the morphological distribution, Chandra X-ray and HST data were used. A highly complex nonthermal radio emission distribution is seen in the cluster at very low frequencies, with a global spectral index α0.2350.61~-1.17±0.37. We have detected a giant radio halo within the cluster system with a linear size of 1.58Mpc and a ``Chair-shaped'' filament structure between the merging subclusters of linear size 853kpc at 0.235GHz. This is the most powerful halo ever observed with P1.4=9.88x1025W/Hz and an equipartition magnetic field estimate of ∼6.49µG. The bright filament structure is well located in the central merging region of subclusters with enhanced temperature, as shown by Chandra and HST data analysis, further indicating the formation of this structure due to shock waves encountered within the ICM during the merger events.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: intracluster medium - instrumentation: interferometers - surveys

Nomenclature: Table 3, Fig. 1: [PRC2013] A (Nos B,C and F), [PRC2013] HT, [PRC2013] CN (Nos C1-C4).

CDS comments: Table 3 NVSS J071741+374316 not identified.

Simbad objects: 18

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Number of rows : 18

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 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1279 1
2 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 810 1
3 [PRC2013] C4 Rad 07 17 32.260 +37 44 43.80           ~ 1 0
4 NVSS J071734+374501 Rad 07 17 34.1 +37 45 01           ~ 2 0
5 [PRC2013] C2 Rad 07 17 36.370 +37 44 03.37           ~ 1 0
6 B3 0714+378 Rad 07 17 36.50 +37 45 23.0           ~ 169 2
7 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 370 0
8 2MASX J07173724+3744224 BiC 07 17 37.2116 +37 44 22.965           ~ 7 0
9 [PRC2013] B rG 07 17 41.070 +37 43 14.65           ~ 1 0
10 NVSS J071741+374313 Rad 07 17 41.24 +37 43 13.4           ~ 1 0
11 [SGM2010] J071741.444+374410.54 G 07 17 41.444 +37 44 10.54         20.6 ~ 3 0
12 NVSS J071753+374209 rG 07 17 53.506 +37 42 09.28           ~ 3 0
13 4C 33.21 Rad 07 35 55.5731 +33 07 09.728   21.0       ~ 35 1
14 ACO 1240 ClG 11 23 32 +43 06.5           ~ 73 0
15 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3772 1
16 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 832 1
17 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 504 0
18 ACO 2345 ClG 21 27 09.80 -12 09 58.8           ~ 112 1

    Equat.    Gal    SGal    Ecl

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2020.10.21-04:01:53

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