Particle Dark Matter Searches Outside the Local Group

被引：47

作者：

Regis, Marco ^{[1
,2
]}

Xia, Jun-Qing ^{[3
]}

Cuoco, Alessandro ^{[1
,2
]}

Branchini, Enzo ^{[4
,5
,6
]}

Fornengo, Nicolao ^{[1
,2
]}

Viel, Matteo ^{[7
]}

机构：

[1] Univ Turin, Dipartimento Fis, I-10125 Turin, Italy

[2] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[3] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[4] Ist Nazl Fis Nucl, Sez Roma Tre, I-00146 Rome, Italy

[5] INAF, Osservatorio Astron Roma, Monte Porzio Catone, Italy

[6] INAF, Osservatorio Astron Trieste, I-34141 Trieste, Italy

[7] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 24期

基金：

美国国家科学基金会;

关键词：

CROSS-CORRELATION; CATALOG; SIGNAL;

D O I：

10.1103/PhysRevLett.114.241301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

If dark matter (DM) is composed by particles which are nongravitationally coupled to ordinary matter, their annihilations or decays in cosmic structures can result in detectable radiation. We show that the most powerful technique to detect a particle DM signal outside the Local Group is to study the angular cross-correlation of nongravitational signals with low-redshift gravitational probes. This method allows us to enhance the signal to noise from the regions of the Universe where the DM-induced emission is preferentially generated. We demonstrate the power of this approach by focusing on GeV-TeV DM and on the recent cross-correlation analysis between the 2MASS galaxy catalogue and the Fermi-LAT gamma-ray maps. We show that this technique is more sensitive than other extragalactic gamma-ray probes, such as the energy spectrum and angular autocorrelation of the extragalactic background, and emission from clusters of galaxies. Intriguingly, we find that the measured cross-correlation can be well fitted by a DM component, with a thermal annihilation cross section and mass between 10 and 100 GeV, depending on the small-scale DM properties and gamma-ray production mechanism. This solicits further data collection and dedicated analyses.

引用

页数：6

共 39 条

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