2012MNRAS.420.2006N

Query : 2012MNRAS.420.2006N

2012MNRAS.420.2006N - Mon. Not. R. Astron. Soc., 420, 2006-2019 (2012/March-1)

How many radio relics await discovery?

NUZA S.E., HOEFT M., VAN WEEREN R.J., GOTTLOBER S. and YEPES G.

Abstract (from CDS):

Upcoming radio telescopes will allow us to study the radio sky at low frequencies with unprecedented sensitivity and resolution. New surveys are expected to discover a large number of new radio sources, in particular those with a steep radio spectrum. Here we investigate the abundance of radio relics, i.e. steep-spectrum diffuse radio emission coming from the periphery of galaxy clusters, which is believed to trace shock waves induced by cluster mergers. With the advent of comprehensive relic samples, a framework is needed to analyse the relic abundance statistically. To this end, we introduce the probability of finding a relic located in a galaxy cluster with given mass and redshift, which allows us to relate the halo mass function of the Universe to radio-relic number counts. To date, about 45 relics have been reported in the literature and we compile the resulting counts, N(>S1.4). In principle, the parameters of the distribution could be determined using a sufficiently large relic sample. However, since the number of known relics is still small, for that purpose we use the MARENOSTRUM UNIVERSE simulation to determine the relic radio-power scaling with cluster mass and redshift. Our model is able to reproduce the recently found tentative evidence for an increase in the fraction of clusters hosting relics, both with X-ray luminosity and redshift, using an X-ray flux-limited cluster sample. Moreover, we find that a considerable fraction of faint relics (S1.4 ≲ 10 mJy) reside in clusters with an X-ray flux below ≲ 3 {x} 10–12 erg/s/cm2. Finally, we estimate the number of radio relics that await discovery by future low-frequency surveys proposed for the Low Frequency Array (LOFAR) and the Westerbork Synthesis Radio Telescope (WSRT). We estimate that the Westerbork Observations of the Deep APERTIF Northern-Sky (WODAN) survey proposed for WSRT may discover 900 relics and that the LOFAR–Tier 1–120 MHz survey may discover about 2500 relics. However, the actual number of newly discovered relics will depend crucially on the existence of sufficiently complete galaxy cluster catalogues.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): shock waves - radiation mechanisms: non-thermal - methods: numerical - galaxies: clusters: general - large-scale structure of Universe

Simbad objects: 47

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Number of rows : 47
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 ZwCl 0008+5215 ClG 00 11 37.197 +52 32 31.68           ~ 61 0
2 ACO 13 ClG 00 13 38.5 -19 30 19           ~ 107 1
3 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
4 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
5 ACO 115 ClG 00 55 59 +26 23.2           ~ 295 1
6 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
7 ClG 0217+70 ClG 02 17 00.0 +70 36 00           ~ 40 0
8 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
9 ACO 523 ClG 04 59 01 +08 46.5           ~ 66 0
10 ACO 548 ClG 05 47 01.7 -25 36 59           B8 209 2
11 ACO 3365 ClG 05 48 12 -21 56.1           ~ 41 0
12 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
13 ClG J0603.3+4214 ClG 06 03.3 +42 14           ~ 141 0
14 [KMA2007] 138.91895+25.19876 ClG 06 35 10.58 +75 31 55.4           ~ 6 0
15 CIZA J0649.3+1801 ClG 06 49 22.8 +18 01 00           ~ 16 0
16 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
17 ACO 610 ClG 07 59 21.77 +27 08 29.2           ~ 47 0
18 [DR2006] J0809+39 Rad 08 08 38 +38 56.0           ~ 6 0
19 ACO 725 ClG 09 01 10.10 +62 37 19.7           ~ 29 0
20 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
21 ACO 746 ClG 09 09 34.7638 +51 32 56.134           ~ 55 0
22 ACO 781 ClG 09 20 25.4 +30 30 07           ~ 167 0
23 ACO 786 ClG 09 28 04.9 +74 46 58           ~ 43 0
24 BAX 163.4480+54.8499 ClG 10 53 50.83 +54 49 55.1           ~ 59 0
25 ACO 1240 ClG 11 23 37.7 +43 03 28           ~ 113 0
26 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 168 0
27 PLCKESZ G287.0+32.9 ClG 11 50 49.20 -28 04 36.5           ~ 100 0
28 ACO 1612 ClG 12 47 43.2 -02 47 32           ~ 40 0
29 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
30 ACO 1664 ClG 13 03 42.4 -24 14 44           ~ 136 0
31 BAX 199.3086-25.5133 ClG 13 14 25.4 -25 15 44           ~ 118 0
32 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
33 ACO S 753 ClG 14 03 35.9 -33 59 16           ~ 91 1
34 ACT-CL J1431.8+1331 ClG 14 31 50.09 +13 32 04.9           ~ 16 0
35 ACO 2034 ClG 15 10 03.9 +33 30 57           ~ 248 1
36 ACO 2048 ClG 15 15 14.11 +04 23 10.4           ~ 109 0
37 ACO 2061 ClG 15 21 19.90 +30 37 13.0           ~ 214 1
38 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
39 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
40 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
41 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
42 ACO 2345 ClG 21 27 05.391 -12 09 07.41           ~ 151 0
43 NVSS J212709-120958 Rad 21 27 09.27 -12 10 01.5           ~ 132 1
44 VLSS J2217.5+5943 Rad 22 17 31.6 +59 43 07           ~ 10 0
45 CIZA J2242.8+5301 ClG 22 42 53.0 +53 01 05           ~ 228 0
46 ZwCl 2341+0000 ClG 23 43 40.566 +00 18 18.94           ~ 83 0
47 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3

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