2026ApJ...997..227L

Query : 2026ApJ...997..227L

2026ApJ...997..227L - Astrophys. J., 997, 227 (2026/February-1)

Search for γ-Ray Emission from Cluster of Galaxies with Fermi-LAT Data.

LI S. and HAN F.

Abstract (from CDS):

In this work, we carry out a systematic search for γ-ray emission from 65 galaxy clusters based on 16 yr of Fermi Large Area Telescope data in the energy range from 500 MeV to 500 GeV. Only two clusters, A2065 and A2244, exhibit significant emission, with local significances of ∼5σ. The test statistic (TS) values are ∼25.4 for A2065 and ∼25.1 for A2244. We investigate a potential dark matter (DM) origin for these signals. The peak TS value of A2065 is ∼26.2 for the DM annihilation channel $\chi \chi \to b\bar{b}$ at a DM mass of mχ ∼ 25.0 GeV. For A2244, the largest TS value is ∼14.5 for $\chi \chi \to b\bar{b}$ at mχ ∼ 6.0 GeV. However, the corresponding cross sections conflict with the upper limits derived from observations of dwarf spheroidal galaxies. This indicates that these signals cannot be attributed to DM annihilation. Finally, we consider the γ-ray flux arising from hadronic cosmic-ray (CR) interactions in the intracluster medium, with the corresponding estimated volume-averaged CR-to-thermal pressure ratios being ∼4% and ∼16%, respectively.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxy clusters - Gamma-ray observatories - Cold dark matter

Simbad objects: 75

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Number of rows : 75
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 2734 ClG 00 11 21.60 -28 51 16.6           ~ 156 0
2 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
3 PMN J0056-0120 Rad 00 56 01.921 -01 20 33.05           ~ 2 1
4 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
5 PMN J0056-0116 Rad 00 56 25.3 -01 16 35           ~ 1 0
6 PMN J0056-0100 rG 00 56 55.06585 -01 00 13.7567           ~ 4 1
7 PMN J0057-0052 Rad 00 57 02.6 -00 52 13           ~ 1 0
8 Z 384-48 rG 00 57 34.90446247 -01 23 27.5469897   14.07 15.10     ~ 269 1
9 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
10 ACO 2877 ClG 01 09 49.3 -45 54 02           ~ 160 2
11 BAX 020.7979+33.4606 ClG 01 23 11.3 +33 27 36           ~ 34 0
12 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 727 1
13 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 420 0
14 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
15 IC 310 AGN 03 16 42.9787569912 +41 19 29.615579544   14.3       ~ 311 2
16 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
17 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
18 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 402 1
19 BAX 055.3242+15.3961 ClG 03 41 16.9 +15 24 27           ~ 45 0
20 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
21 ACO S 405 ClG 03 51 32.8 -82 13 15           ~ 50 0
22 ACO 478 ClG 04 13 24.8 +10 27 52           ~ 522 0
23 ClG 0422-09 ClG 04 25 51.02 -08 33 38.5           ~ 97 0
24 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
25 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
26 ACO S 540 ClG 05 40 06.2 -40 50 29           ~ 60 0
27 BAX 086.3662-25.9386 ClG 05 45 28.5 -25 55 51           ~ 10 0
28 BAX 087.1623-25.4700 ClG 05 48 38.6206 -25 28 59.568           ~ 13 0
29 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 222 1
30 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 312 1
31 BAX 115.2425+55.4275 ClG 07 40 59.4 +55 25 55           ~ 34 0
32 ClG 0915.7-1153 ClG 09 18 06.0 -12 05 45           ~ 16 0
33 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 292 0
34 ZwCl 1215+0400 ClG 12 17 43.62 +03 38 51.5           ~ 169 0
35 BAX 193.5900-29.0100 ClG 12 54 22.1 -29 00 46           ~ 45 0
36 BAX 193.6700-29.2254 ClG 12 54 40.6 -29 13 44           ~ 76 0
37 ACO 3530 ClG 12 55 36.0 -30 20 49           ~ 109 0
38 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 391 1
39 ACO 3532 ClG 12 57 19.2 -30 22 13           ~ 185 2
40 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 325 0
41 ACO 1651 ClG 12 59 27.3 -04 10 49           ~ 307 0
42 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
43 ACO 1736 ClG 13 26 52.1 -27 06 33           ~ 268 2
44 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
45 ACO 3560 ClG 13 32 23.7 -33 08 21           ~ 145 1
46 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
47 ACO 1775 ClG 13 41 50.60 +26 21 10.6           ~ 324 0
48 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
49 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
50 ACO 1800 ClG 13 49 27.19 +28 04 44.6           ~ 127 0
51 BAX 220.1796+03.4530 ClG 14 40 34.37 +03 29 49.7     14.31     ~ 131 0
52 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
53 ACT-CL J1521.8+0742 ClG 15 21 48.8 +07 43 41     15.13     ~ 326 0
54 ACO 2065 ClG 15 22 22.7 +27 44 20           ~ 398 0
55 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
56 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
57 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
58 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
59 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
60 ZwCl 1742+3306 ClG 17 44 16.2753 +32 59 55.115           ~ 93 0
61 PMN J2011-5644 rG 20 11 27.5061252528 -56 44 07.084747536   16.56   15.16   ~ 26 1
62 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
63 ACO 3695 ClG 20 34 47.7 -35 49 39           ~ 96 2
64 IC 1365 GrG 21 14 03.6958 +02 34 14.568           ~ 52 0
65 ACO 3822 ClG 21 54 06.2 -57 50 49           ~ 98 0
66 ACO 3827 ClG 22 01 49.1 -59 57 15           ~ 178 0
67 ACO 3921 ClG 22 49 59.0 -64 25 48           ~ 165 1
68 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 272 1
69 BAX 349.3187+18.7197 ClG 23 17 11.184 +18 41 48.87           ~ 97 0
70 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 572 0
71 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 515 2
72 ACT-CL J2344.3-0422 ClG 23 44 15.98 -04 22 24.5           ~ 53 0
73 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 280 3
74 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
75 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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