2010A&A...517A..43M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST21:06:49

2010A&A...517A..43M - Astronomy and Astrophysics, volume 517, A43-43 (2010/7-1)

The very steep spectrum radio halo in Abell 697.

MACARIO G., VENTURI T., BRUNETTI G., DALLACASA D., GIACINTUCCI S., CASSANO R., BARDELLI S. and ATHREYA R.

Abstract (from CDS):

We present a detailed study of the giant radio halo in the galaxy cluster Abell 697 to constrain its origin and connection with the cluster dynamics. We performed high sensitivity GMRT observations at 325MHz, which showed that the radio halo is much brighter and larger at this frequency than in previous 610MHz observations. To derive the integrated spectrum in the frequency range 325MHz-1.4GHz, we reanalysed archival VLA data at 1.4GHz and used proprietary GMRT data at 610MHz. Our multifrequency analysis shows that the total radio spectrum of the giant radio halo in A697 is very steep, with α325MHz1.4GHz≃1.7-1.8. Owing to energy arguments, a hadronic origin of the halo is disfavoured by this steep spectrum. Very steep spectrum halos in merging clusters are predicted in the case that the emitting electrons are accelerated by turbulence. Observations with upcoming low frequency arrays will be able to test these expectations.

Abstract Copyright:

Journal keyword(s): radiation mechanism: non-thermal - galaxies: clusters: general - galaxies: clusters: individual: Abell 697

Nomenclature: Fig. 1: [MVB2010] SN (Nos S1-S2).

Simbad objects: 15

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Number of rows : 15

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           ~ 572 0
2 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1266 1
3 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 358 0
4 B3 0714+378 Rad 07 17 36.50 +37 45 23.0           ~ 169 2
5 4C 33.21 Rad 07 35 55.5731 +33 07 09.728   21.0       ~ 34 1
6 NVSS J084240+361916 Rad 08 42 40.22 +36 19 16.4           ~ 2 0
7 [VGD2008] D rG 08 42 54.54 +36 21 05.0           ~ 3 0
8 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 214 0
9 SDSS J084257.62+362201.0 rG 08 42 57.629 +36 22 01.02   21.90       ~ 7 0
10 NVSS J084259+361743 Rad 08 42 59.67 +36 17 43.7           ~ 3 1
11 [VGD2008] G rG 08 43 05.65 +36 22 25.0           ~ 3 0
12 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3716 1
13 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 283 1
14 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 317 0
15 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 414 1

    Equat.    Gal    SGal    Ecl

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2020.07.11-21:06:49

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