Document Type
Article
Publication Date
3-2-2023
Department
Department of Physics
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.
Publication Title
Astrophysical Journal
Recommended Citation
Alfaro, R.,
Alvarez, C.,
Arteaga-Velázquez, J.,
Rojas, D.,
Solares, H.,
Babu, R.,
Huang, D.,
Turner, R.,
&
et al.
(2023).
Searching for TeV Dark Matter in Irregular Dwarf Galaxies with HAWC Observatory.
Astrophysical Journal,
945(1).
http://doi.org/10.3847/1538-4357/acb5f1
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/16996
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Version
Publisher's PDF
Publisher's Statement
© 2023. The Author(s). Published by the American Astronomical Society. Publisher’s version of record: https://doi.org/10.3847/1538-4357/acb5f1