Prospective dark matter annihilation signals from the Sagittarius Dwarf Spheroidal

被引：2

作者：

Venville, Thomas A. A. ^{[1
,2
]}

Duffy, Alan R. ^{[1
,2
]}

Crocker, Roland M. ^{[3
]}

Macias, Oscar ^{[4
,5
]}

Tepper-Garcia, Thor ^{[6
,7
]}

机构：

[1] Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia

[2] ARC Ctr Excellence Dark Matter Particle Phys, Melbourne, Australia

[3] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[4] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA

[5] Univ Amsterdam, GRAPPA Gravitat & Astroparticle Phys Amsterdam, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[6] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

[7] Ctr Excellence All Sky Astrophys Three Dimens ASTR, Canberra, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 527卷 / 03期

基金：

澳大利亚研究理事会;

关键词：

astroparticle physics; galaxies: individual: Sagittarius Dwarf; dark matter; gamma-rays: galaxies; MILKY-WAY SATELLITES; LARGE-AREA TELESCOPE; SKY SURVEY VIEW; INNER STRUCTURE; GALAXY; MODEL; CONSTRAINTS; KINEMATICS; SEARCH; ORBIT;

D O I：

10.1093/mnras/stad3520

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Sagittarius Dwarf Spheroidal galaxy (Sgr) is investigated as a target for dark matter (DM) annihilation searches utilizing J-factor distributions calculated directly from a high-resolution hydrodynamic simulation of the infall and tidal disruption of Sgr around the Milky Way. In contrast to past studies, the simulation incorporates DM, stellar and gaseous components for both the Milky Way and the Sgr progenitor galaxy. The simulated distributions account for significant tidal disruption affecting the DM density profile. Our estimate of the J-factor value for Sgr, J(Sgr) = 1.48 x 10(10) M-circle dot(2) kpc(-5) (6.46 x 10(16) GeV cm(-5)), is significantly lower than found in prior studies. This value, while formally a lower limit, is likely close to the true J-factor value for Sgr. It implies a DM cross-section incompatibly large in comparison with existing constraints would be required to attribute recently observed gamma-ray emission from Sgr to DM annihilation. We also calculate a J-factor value using a NFW profile fitted to the simulated DM density distribution to facilitate comparison with past studies. This NFW J-factor value supports the conclusion that most past studies have overestimated the dark matter density of Sgr on small scales. This, together with the fact that the Sgr has recently been shown to emit gamma-rays of astrophysical origin, complicate the use of Sgr in indirect DM detection searches.

引用

页码：5324 / 5338

页数：15

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