2008A&A...480..687C


Query : 2008A&A...480..687C

2008A&A...480..687C - Astronomy and Astrophysics, volume 480, 687-697 (2008/3-4)

Revised statistics of radio halos and the reacceleration model.

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

Abstract (from CDS):

The statistical properties of radio halos can be used to discriminate among the possible models for their origin. Therefore, an unbiased and exhaustive investigation of these properties is crucial. With this goal in mind, in this paper, we revise the occurrence of radio halos in the redshift range 0-0.4, combining the low redshift (z<0.2) statistical study of the X-ray-brightest Abell-type clusters (XBACs) with the NRAO VLA Sky Survey (NVSS, by Giovannini et al., 1999NewA....4..141G) with our recent results from the radio followup of the ROSAT-ESO Flux-Limited X-Ray (REFLEX) clusters and extended ROSAT Brightest Cluster Sample (eBCS), i.e., the Giant Metrewave Radio Telescope (GMRT) radio halo survey, at higher redshift (0.2<z<0.4). We find significant statistical evidence (at 3.7σ) of an increase of the fraction of clusters with radio halos with the X-ray luminosity (mass) of the parent clusters, and show that this increase is in line with statistical calculations based on the reacceleration scenario. We argue that a fundamental expectation of this scenario is that the probability of having radio halos emitting at hundred MHz is larger than the probability at GHz frequencies, and thus future radio interferometers operating at low frequencies, such as the Low Frequency Array (LOFAR) and the Long Wavelength Array (LWA), should detect a larger number of radio halos with respect to those caught by present GHz observations. We also show that the expected increase of the fraction of clusters with radio halos with the cluster mass as measured with future LOFAR and LWA surveys should be less strong than the increase in present surveys.

Abstract Copyright:

Journal keyword(s): radiation mechanism: non-thermal - galaxies: clusters: general - radio continuum: general - X-rays: general

Simbad objects: 53

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Number of rows : 53
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ACO 2697 ClG 00 03 11.5 -06 05 30           ~ 38 0
2 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 644 0
3 2MASX J00274579+2616264 ClG 00 27 45.90 +26 16 25.0           ~ 34 0
4 ACO 2813 ClG 00 43 27.8821 -20 37 01.282           ~ 82 0
5 ACO 141 ClG 01 05 30.2342 -24 39 17.430           ~ 73 0
6 ACO 2895 ClG 01 18 04.48 -27 00 13.4           ~ 35 0
7 ACO 209 ClG 01 31 57.5 -13 34 35           ~ 271 0
8 ACO 388 ClG 02 51 36 -03 45.7           ~ 7 0
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6325 1
10 ACO 3088 ClG 03 07 02.12 -28 39 57.3           ~ 64 0
11 1RXS J043709.8+004337 ClG 04 37 12.0820 +00 43 37.737           ~ 39 0
12 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 228 0
13 [DBG99] 46 ClG 05 10 43.85 -08 01 13.0           ~ 24 0
14 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 241 0
15 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 233 0
16 ZwCl 0857+2107 ClG 09 00 37.9 +20 54 58           ~ 82 0
17 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 273 0
18 ACO 781 ClG 09 20 25.4 +30 30 07           ~ 135 0
19 ZwCl 0947+1723 ClG 09 49 51.8 +17 07 05           ~ 68 0
20 ZwCl 0949+5207 ClG 09 52 49.1 +51 53 05           ~ 121 0
21 ACO 963 ClG 10 17 09.6 +39 01 00           ~ 372 0
22 ACO 3444 ClG 10 23 53.1540 -27 15 07.840           ~ 71 0
23 ZwCl 1113+0144 ClG 11 15 54.0 +01 29 44           ~ 33 0
24 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 140 0
25 ACO 1423 ClG 11 57 47.34 +33 42 43.5           ~ 152 0
26 1RXS J121217.1-181750 X 12 12 17.1 -18 17 50           ~ 1 0
27 ZwCl 1303+2647 ClG 13 05 58.0 +26 30 53   20.1       ~ 22 0
28 ACO 1682 ClG 13 06 49.7 +46 32 59           ~ 125 1
29 ZwCl 1309+2216 ClG 13 11.5 +22 00           ~ 23 0
30 BAX 199.3086-25.5133 ClG 13 14 31.5049 -25 15 56.602           ~ 96 0
31 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 237 2
32 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 284 0
33 ACO 1773 ClG 13 42 11.73 +02 13 28.2           ~ 109 0
34 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62     ~ 274 0
35 ACO S 780 ClG 14 59 29.1 -18 10 45           ~ 70 0
36 ZwCl 1459+4240 ClG 15 01 20.6251 +42 20 47.148           ~ 50 0
37 ClG J1504-0248 ClG 15 04 07.4 -02 48 15           ~ 160 0
38 RXC J1512.2-2254 ClG 15 12 12.6 -22 54 59           ~ 12 0
39 1RXS J151459.1-152356 X 15 14 59.1 -15 23 56           ~ 3 0
40 LEDA 1900245 Bla 15 32 53.780 +30 20 59.41   19.1   15.7   ~ 136 0
41 ACO 2111 ClG 15 39 40.9 +34 25 04           ~ 165 0
42 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 541 0
43 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 337 0
44 ACO 2261 ClG 17 22 28.3 +32 09 13           ~ 314 0
45 RXC J2003.5-2323 ClG 20 03 32.3 -23 23 30           ~ 55 0
46 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 652 2
47 2E 2209.1-0404 X 22 11 46.2 -03 49 42           ~ 5 0
48 BAX 337.1433+20.6131 ClG 22 28 37.1 +20 36 31           ~ 105 0
49 ACO 2485 ClG 22 48 33 -16 07.1           ~ 46 0
50 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 122 0
51 ACO 2631 ClG 23 37 40.7 +00 16 35           ~ 150 0
52 ACO 2645 ClG 23 41 17.0 -09 01 11           ~ 81 0
53 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 161 0

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2022.07.05-09:18:38

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