Decaying dark matter in dwarf spheroidal galaxies: Prospects for x-ray and gamma-ray telescopes

被引：14

作者：

Ando, Shin'ichiro ^{[1
,2
,3
]}

Barik, Suvendu K. ^{[2
]}

Feng, Zhuoran ^{[1
]}

Finetti, Marco ^{[2
]}

Chaves, Andreas Guerra ^{[1
]}

Kanuri, Sahaja ^{[1
]}

Kleverlaan, Jorinde ^{[4
]}

Ma, Yixuan ^{[4
]}

Di Serracapriola, Nicolo Maresca ^{[2
]}

Meinema, Matthew S. P. ^{[1
]}

Martinez, Imanol Navarro ^{[2
]}

Ng, Kenny C. Y. ^{[1
,2
,5
]}

Peerbooms, Ebo ^{[2
]}

van Veen, Casper A. ^{[1
]}

Zimmer, Fabian ^{[1
]}

机构：

[1] Univ Amsterdam, GRAPPA Inst, NL-1098 XH Amsterdam, Netherlands

[2] Univ Amsterdam, Inst Theoret Phys, NL-1098 XH Amsterdam, Netherlands

[3] Univ Tokyo, Kavli Inst Phys & Math Universe Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan

[4] Univ Amsterdam, Anton Pannekoek Inst Astron, NL-1098 XH Amsterdam, Netherlands

[5] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW D | 2021年 / 104卷 / 02期

基金：

欧盟地平线“2020”;

关键词：

LINE;

D O I：

10.1103/PhysRevD.104.023022

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dwarf spheroidal galaxies are dark matter dominated systems, and as such, ideal for indirect dark matter searches. If dark matter decays into high-energy photons in the dwarf galaxies, they will be a good target for current and future generations of x-ray and gamma-ray telescopes. By adopting the latest estimates of density profiles of dwarf galaxies in the Milky Way, we revise the estimates dark matter decay rates in dwarf galaxies; our results are more robust, but weaker than previous estimates. Applying these results, we study the detectability of dark matter decays with x-ray and very-high-energy gamma-ray telescopes, such as eROSITA, XRISM, Athena, HAWC, and CTA. Our projection shows that all of these x-ray telescopes will be able to critically assess the claim of the 7 keV sterile neutrino decays from stacked galaxy clusters and nearby galaxies. For TeV decaying dark matter, we can constrain its lifetime to be longer than similar to 10(27)-10(28) s. We also make projections for future dwarf galaxies that would be newly discovered with the Vera Rubin Observatory Legacy Survey of Space and Time, which will further improve the expected sensitivity to dark matter decays both in the keV and PeV mass ranges.

引用

页数：19

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