Dark matter annihilation in the first galaxy haloes

被引：17

作者：

Schoen, S. ^{[1
]}

Mack, K. J. ^{[1
,2
,3
]}

Avram, C. A. ^{[1
,3
]}

Wyithe, J. S. B. ^{[1
,2
]}

Barberio, E. ^{[1
,3
]}

机构：

[1] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia

[2] CAASTRO, ARC Ctr Excellence All Sky Astrophys, Sydney, NSW 2016, Australia

[3] CoEPP, ARC Ctr Excellence Particle Phys Terascale, Melbourne, Vic 3010, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 451卷 / 03期

基金：

澳大利亚研究理事会;

关键词：

dark ages; reionization; first stars; dark matter; ESCAPE FRACTION; STAR; MODELS;

D O I：

10.1093/mnras/stv1056

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the impact of energy released from self-annihilating dark matter (DM) on heating of gas in the small, high-redshift DM haloes thought to host the first stars. A super-symmetric (SUSY)-neutralino-like particle is implemented as our DM candidate. The PYTHIA code is used to model the final, stable particle distributions produced during the annihilation process. We use an analytic treatment in conjunction with the code MEDEA2 to find the energy transfer and subsequent partition into heating, ionizing and Lyman alpha photon components. We consider a number of halo density models, DM particle masses and annihilation channels. We find that the injected energy from DM exceeds the binding energy of the gas within a 10(5)-10(6)M(circle dot) halo at redshifts above 20, preventing star formation in early haloes in which primordial gas would otherwise cool. Thus we find that DM annihilation could delay the formation of the first galaxies.

引用

页码：2840 / 2850

页数：11

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