2013A&A...560A..64H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST11:21:04

2013A&A...560A..64H - Astronomy and Astrophysics, volume 560A, 64-64 (2013/12-1)

Probing the cosmic-ray content of galaxy clusters by stacking Fermi-LAT count maps.

HUBER B., TCHERNIN C., ECKERT D., FARNIER C., MANALAYSAY A., STRAUMANN U. and WALTER R.

Abstract (from CDS):

Radio observations have shown that galaxy clusters are giant reservoirs of cosmic rays (CR). Although a gamma-ray signal from the cluster volume is expected to arise through interactions of CR protons with the ambient plasma, a confirming observation is still missing. We searched for a cumulative gamma-ray emission in the direction of galaxy clusters by analysing a collection of stacked Fermi-LAT count maps. Additionally, we investigated possible systematic differences in the emission between cool-core and non-cool-core cluster populations. Making use of a sample of 53 clusters selected from the HIFLUGCS catalog, we do not detect a significant signal from the stacked sample. The upper limit on the average flux per cluster derived for the total stacked sample is at the level of a few 10–11ph/cm2/s at a 95% confidence level in the 1-300GeV band, assuming power-law spectra with photon indices 2.0, 2.4, 2.8, and 3.2. Separate stacking of the cool-core and non-cool-core clusters in the sample lead to similar values of around 5x10–11ph/cm2/s and 2x10–11ph/cm2/s, respectively. Under the assumption that decaying π0, produced in collisions between CRs and the ambient thermal gas, are responsible for gamma-ray emission, we set upper limits on the average CR content in galaxy clusters. For the entire cluster population, our upper limit on the gamma-ray flux translates into an upper limit on the average CR-to-thermal energy ratio of 4.6% for a photon index of 2.4, although it is possible for individual systems to exceed this limit. Our 95% upper limits are at the level expected from numerical simulations, which most likely suggests that the injection of CR at cosmological shocks is less efficient than previously assumed.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - gamma rays: galaxies: clusters - methods: data analysis - astroparticle physics - rays cosmic

Simbad objects: 69

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Number of rows : 69

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 85 ClG 00 41 37.8 -09 20 33           ~ 789 0
2 ACO 119 ClG 00 56 16.8 -01 15 00           ~ 517 2
3 ACO 133 ClG 01 02 39.0 -21 57 15           ~ 336 1
4 ACO 2877 ClG 01 09 49.3 -45 54 02           ~ 137 2
5 NGC 499 LIN 01 23 11.501 +33 27 36.73   13.0 12.3     ~ 147 0
6 NGC 507 BiC 01 23 39.950 +33 15 22.22   13.0       ~ 395 3
7 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 652 1
8 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 385 3
9 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 346 0
10 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 519 0
11 ACO 3112 ClG 03 17 52.4 -44 14 35           ~ 290 1
12 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1939 1
13 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3545 3
14 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1538 0
15 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 271 0
16 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 467 0
17 NGC 1550 BiC 04 19 37.921 +02 24 35.58   14.0       ~ 150 1
18 ClG 0422-09 ClG 04 25 51.02 -08 33 38.5           ~ 84 0
19 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 371 0
20 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 660 2
21 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3479 0
22 ACO 548 ClG 05 47 01.7 -25 36 59           B8 196 2
23 ACO 3376 ClG 06 01 42.1521 -39 59 06.227           ~ 270 0
24 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 170 1
25 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 179 0
26 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 284 1
27 UGC 3957 BiC 07 40 58.222 +55 25 37.98   14.2       ~ 44 1
28 ACO 780 ClG 09 18 30 -12 15.7           ~ 428 0
29 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 774 1
30 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 994 1
31 ACO 1413 ClG 11 55 18.0 +23 24 19           ~ 381 0
32 NAME NGC 4073 Group GrG 12 04 21.7 +01 50 19     13.53     ~ 245 0
33 ZwCl 1215+0400 ClG 12 17 40.6 +03 39 45           ~ 105 0
34 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1959 2
35 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1041 1
36 NAME A3528-N ClG 12 54 22.1 -29 00 46           ~ 34 0
37 NAME A3528-S ClG 12 54 40.6 -29 13 44           ~ 53 0
38 ACO 3530 ClG 12 55 36 -30 21.2           ~ 89 0
39 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 332 1
40 ACO 3532 ClG 12 57 19.2 -30 22 13           ~ 154 2
41 ACO 1650 ClG 12 58 36.76 -01 43 34.2           ~ 270 0
42 ACO 1651 ClG 12 59 22.43 -04 11 47.1           ~ 274 0
43 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4208 2
44 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1022 0
45 NGC 5044 BiC 13 15 23.969 -16 23 08.00   11.9   10.74   ~ 452 0
46 ACO 1736 ClG 13 26 52.1 -27 06 33           ~ 237 2
47 ACO 3558 ClG 13 27 54.8 -31 29 32           ~ 406 2
48 ACO 3560 ClG 13 32 23.7 -33 08 21           ~ 120 1
49 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 283 1
50 ACO 1775 ClG 13 41 55.6 +26 21 53           ~ 277 0
51 ACO 3571 ClG 13 47 28.9 -32 51 57           ~ 264 2
52 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1154 0
53 ACO 1800 ClG 13 49 41.4 +28 04 08           ~ 99 0
54 ACO 3581 ClG 14 07 29.8 -27 01 04           ~ 165 3
55 ACO 1914 ClG 14 26 01.3 +37 49 36           ~ 273 0
56 ACO 2065 ClG 15 22 42.6 +27 43 21           ~ 343 0
57 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 672 0
58 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 555 3
59 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1101 1
60 ACO 2244 ClG 17 02 34.01 +34 04 41.1           ~ 246 0
61 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 830 1
62 NAME Oph Cluster ClG 17 12 24.7 -23 21 01           ~ 240 0
63 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 502 0
64 ACO 3921 ClG 22 49 38.6 -64 23 15           ~ 137 1
65 HCG 94 CGG 23 17 16.5 +18 43 11           ~ 76 0
66 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 297 1
67 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 493 0
68 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 480 2
69 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 260 3

    Equat.    Gal    SGal    Ecl

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2020.07.11-11:21:04

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