2012A&A...545A..74G

Query : 2012A&A...545A..74G

2012A&A...545A..74G - Astronomy and Astrophysics, volume 545A74-74 (2012/9-1)

Detection of diffuse radio emission in the galaxy clusters A800, A910, A1550, and CL 1446+26.

GOVONI F., FERRARI C., FERETTI L., VACCA V., MURGIA M., GIOVANNINI G., PERLEY R. and BENOIST C.

Abstract (from CDS):

Radio halos are elusive sources located at the center of merging galaxy clusters. To date, only about 40 radio halos are known, thus the discovery of new halos provides important insights into this class of sources. To improve the quality of the statistics of radio halos, we investigate the radio continuum emission of a sample of galaxy clusters. We analyzed archival Very Large Array observations at 1.4GHz, with a resolution of ≃1'. These observations were complemented by X-ray, optical, and higher-resolution radio data, leading to the detection of a new radio halo in the central region of A800 and A1550. We discovered a radio relic in the periphery of A910, and finally revealed both a halo and a relic in CL1446+26. The clusters hosting these new halos show an offset between the radio and the X-ray peak. By analyzing this offset statistically, we find that radio halos can be quite asymmetric with respect to the X-ray gas distribution, with an average radio-X-ray displacement of about 180kpc. When the offsets are normalized by the halo size, there is a tendency for smaller halos to have larger displacements.

Abstract Copyright: ∼

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

Nomenclature: Table 2: [GFF2012] ANNNN A [GFF2012] CL1446+26 A N=17 (Nos [GFF2012] A800 A-B, [GFF2012] A910 A-F, [GFF2012] A1550 A-C, [GFF2012] CL1446+26 A-F)

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 ACO 149 ClG 01 09 22.2647 +43 38 01.337           ~ 12 0
3 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 326 0
4 ClG 0217+70 ClG 02 17 00.0 +70 36 00           ~ 40 0
5 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 420 0
6 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
7 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
8 ACO 523 ClG 04 59 01 +08 46.5           ~ 66 0
9 ACO 545 ClG 05 32 24.4152 -11 32 35.080           ~ 102 0
10 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
11 B3 0714+378 Rad 07 17 36.6 +37 45 01           ~ 170 2
12 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
13 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
14 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 308 0
15 ACO 781 ClG 09 20 25.4 +30 30 07           ~ 167 0
16 ACO 800 ClG 09 28 29 +37 47.9           ~ 18 0
17 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
18 ACO 910 ClG 10 03 07.9 +67 09 27           ~ 53 0
19 ACO 1213 ClG 11 16 26.98 +29 16 23.9           ~ 155 0
20 ACO 1351 ClG 11 42 24.7795 +58 32 05.558           ~ 90 0
21 ACO 1550 ClG 12 29 02.5 +47 37 20           ~ 57 0
22 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
23 BAX 199.3086-25.5133 ClG 13 14 25.4 -25 15 44           ~ 118 0
24 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
25 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
26 ZwCl 1447+2619 ClG 14 49 28.2 +26 07 57           ~ 54 0
27 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
28 ACO 2034 ClG 15 10 03.9 +33 30 57           ~ 248 1
29 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
30 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
31 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
32 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
33 ACO 2254 ClG 17 17 45.90 +19 40 22.8           ~ 79 0
34 ACO 2294 ClG 17 24 10.1 +85 53 09           ~ 69 0
35 ACO 2319 ClG 19 21 14.0 +43 56 57           ~ 495 1

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