2025ApJ...978L..43C

Query : 2025ApJ...978L..43C

2025ApJ...978L..43C - Astrophys. J., 978, L43 (2025/January-2)

Evaluating the Potential to Constrain Dark Matter Annihilation with Fermi-LAT Observations of Ultrafaint Compact Stellar Systems.

CIRCIELLO A., McDANIEL A., DRLICA-WAGNER A., KARWIN C., AJELLO M., DI MAURO M. and SANCHEZ-CONDE M.A.

Abstract (from CDS):

Recent results from numerical simulations and models of galaxy formation suggest that recently discovered ultrafaint compact stellar systems (UFCSs) in the halo of the Milky Way (MW) may be some of the smallest and faintest galaxies. If this is the case, these systems would be attractive targets for indirect searches of weakly interacting massive particle dark matter (DM) annihilation due to their relative proximity and high expected DM content. In this study, we analyze 14.3 yr of γ-ray data collected by the Fermi-Large Area Telescope coincident with 26 UFCSs. No significant excess γ-ray emission is detected, and we present γ-ray flux upper limits for these systems. Assuming that the UFCSs are DM-dominated galaxies consistent with being among the faintest and least massive MW dwarf spheroidal (dSph) satellite galaxies, we derive the projected sensitivity for a DM annihilation signal. We find that observations of UFCSs have the potential to yield some of the most powerful constraints on DM annihilation, with sensitivity comparable to observations of known dSphs and the Galactic center. This result emphasizes the importance of precise kinematic studies of UFCSs to empirically determine their DM content.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Dark matter - Gamma-ray astronomy

Simbad objects: 43

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Number of rows : 43
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 [LQS2016] DES J0034-4902 GlC 00 33 59.60 -49 02 19.8           ~ 18 0
2 [LPS2017] DES J0111-1341 Cl* 01 11 10.30 -13 41 05.4           ~ 6 0
3 NAME Cetus II G 01 17.9 -17 25           ~ 56 0
4 DELVE 2 Cl* 01 55 05 -68 15.2     17.16     ~ 20 0
5 DELVE 6 Cl* 02 12 17 -66 03.4     18.01     ~ 4 0
6 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
7 NAME Eri III G 02 22 45.480 -52 17 04.92           ~ 79 0
8 [LPS2017] DES J0225+0304 G? 02 25 42.40 +03 04 10.1           ~ 23 0
9 NAME Pic I G 04 43 47.4 -50 16 59           ~ 58 0
10 OGLE-CL LMC 863 Cl* 05 28 22.80 -61 43 25.3           ~ 7 0
11 NAME SMASH 1 GlC 06 20 59.90 -80 23 44.7           ~ 15 0
12 Koposov 2 GlC 07 58 17.00 +26 15 19.4           ~ 85 1
13 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
14 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
15 NAME Leo Minor I Dwarf Galaxy G 10 57 03 +28 52.5     17.16     ~ 6 0
16 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 117 1
17 NAME UMa III Cl* 11 38 49.8 +31 04 42           ~ 22 0
18 NAME Bliss 1 Cl* 11 50 02.64 -41 46 19.2           ~ 12 1
19 Koposov 1 GlC 11 59 18.40 +12 15 35.8           ~ 81 0
20 NAME Kim 3 Cl* 13 22 45.20 -30 36 03.6           ~ 26 0
21 C 1353-269 GlC 13 56 21.702 -27 10 03.00           ~ 146 0
22 NAME Bootes V Dwarf Galaxy G 14 15 38 +32 54.8     16.84     ~ 10 0
23 DELVE 5 Cl* 14 48 25 +17 28.1     18.37     ~ 7 0
24 NAME Virgo II Dwarf Galaxy G 15 00 14 +05 54.5     17.7     ~ 5 0
25 NAME Munoz 1 Cl* 15 01 48.02 +66 58 07.3           ~ 29 0
26 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
27 DELVE 4 Cl* 15 23 06 +27 23.7     18.08     ~ 4 0
28 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
29 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 399 0
30 DELVE 1 Cl* 16 30 54 -00 58.3     16.19     ~ 19 0
31 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
32 [TBK2019] PS1 1 Cl* 19 16 41.09 -27 49 38.0           ~ 6 0
33 DELVE 3 Cl* 19 21 35 -60 47.0     17.43     ~ 4 0
34 NAME Laevens 3 GlC 21 06 54.3 +14 58 48           ~ 43 0
35 NAME Indus I Cl* 21 08 49.970 -51 09 48.60           ~ 68 0
36 NAME Segue 3 Cl* 21 21 31.0 +19 07 02           ~ 75 0
37 [LSP2018] DES 3 Cl* 21 40 13.200 -52 32 30.48           ~ 7 0
38 NAME Balbinot 1 Cl* 22 10 42.819 +14 56 49.03           ~ 29 0
39 NAME Kim 1 Cl* 22 11 41.30 +07 01 31.8           ~ 31 0
40 NAME HSC 1 Cl* 22 17 14 +03 28.8           ~ 6 0
41 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
42 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 307 1
43 NAME Tuc V G 23 37.4 -63 16           ~ 84 0

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