New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints

被引：5
|
作者：
de la Torre Luque, Pedro [1 ,2 ,3 ]
Balaji, Shyam [4 ]
Silk, Joseph [5 ,6 ,7 ,8 ]
机构：
[1] Univ Autonoma Madrid, Dept Fis Teor, M-15, E-28049 Madrid, Spain
[2] Univ Autonoma Madrid, Inst Fis Teor UAM CSIC, C Nicolas Cabrera 13-15, Madrid 28049, Spain
[3] Stockholm Univ, Oskar Klein Ctr, Dept Phys, S-10691 Stockholm, Sweden
[4] Kings Coll London, Phys Dept, London WC2R 2LS, England
[5] CNRS, Inst Astrophys Paris, UMR 7095, 98 Bis Blvd Arago, F-75014 Paris, France
[6] Sorbonne Univ, 98 Bis Blvd Arago, F-75014 Paris, France
[7] Johns Hopkins Univ, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA
[8] Univ Oxford, Beecroft Inst Particle Astrophys & Cosmol, Keble Rd, Oxford OX1 3RH, England
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2024年 / 973卷 / 01期
基金：
欧洲研究理事会; 瑞典研究理事会;
关键词：
EXOTIC ENERGY INJECTION; POSITRON-ANNIHILATION; GALACTIC-CENTER; COSMIC-RAYS; SUBSTRUCTURE; PROPAGATION; EXCESS; I;
D O I：
10.3847/2041-8213/ad72f4
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We explore the 511 keV emission associated with sub-GeV dark matter (DM) particles that can produce electron-positron pairs and form positronium after thermalizing. We use similar to 16 yr of data from the Spectrometer on INTEGRAL to constrain DM properties, including the full positron propagation and losses, and the suppression of free electron density away from the Galactic plane. We show that the predicted longitude and latitude profiles vary significantly for different DM masses, unlike previous assumptions, and obtain the strongest limits on sub-GeV DM (from the MeV to a few GeV) so far, excluding cross sections down to <sigma v > less than or similar to 10-32 cm3 s-1 for m chi similar to 1 MeV and <sigma v > less than or similar to 10-26 cm3 s-1 for m chi similar to 5 GeV and lifetimes up to tau greater than or similar to 1029 s for m chi similar to 1 MeV and tau greater than or similar to 1027 s for m chi similar to 5 GeV for the typical Navarro-Frenk-White DM profile. Our derived limits are robust within a factor of a few due to systematic uncertainties.
引用
收藏
页数：10
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