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Searching for TeV Dark Matter in Irregular Dwarf Galaxies with HAWC Observatory.

Authors :
Alfaro, R.
Alvarez, C.
Arteaga-Velázquez, J. C.
Rojas, D. Avila
Solares, H. A. Ayala
Babu, R.
Belmont-Moreno, E.
Caballero-Mora, K. S.
Capistrán, T.
Carramiñana, A.
Casanova, S.
Chaparro-Amaro, O.
Cotti, U.
Cotzomi, J.
De la Fuente, E.
Diaz Hernandez, R.
Dingus, B. L.
DuVernois, M. A.
Durocher, M.
Díaz-Vélez, J. C.
Source :
Astrophysical Journal. 3/1/2023, Vol. 945 Issue 1, p1-16. 16p.
Publication Year :
2023

Abstract

We present the results of dark matter (DM) searches in a sample of 31 dwarf irregular (dIrr) galaxies within the field of view of the HAWC Observatory. dIrr galaxies are DM-dominated objects in which astrophysical gamma-ray emission is estimated to be negligible with respect to the secondary gamma-ray flux expected by annihilation or decay of weakly interacting massive particles (WIMPs). While we do not see any statistically significant DM signal in dIrr galaxies, we present the exclusion limits (95% C.L.) for annihilation cross section and decay lifetime for WIMP candidates with masses between 1 and 100 TeV. Exclusion limits from dIrr galaxies are relevant and complementary to benchmark dwarf Spheroidal (dSph) galaxies. In fact, dIrr galaxies are targets kinematically different from benchmark dSph, preserving the footprints of different evolution histories. We compare the limits from dIrr galaxies to those from ultrafaint and classical dSph galaxies previously observed with HAWC. We find that the constraints are comparable to the limits from classical dSph galaxies and ∼2 orders of magnitude weaker than the ultrafaint dSph limits. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0004637X
Volume :
945
Issue :
1
Database :
Academic Search Index
Journal :
Astrophysical Journal
Publication Type :
Academic Journal
Accession number :
162209994
Full Text :
https://doi.org/10.3847/1538-4357/acb5f1