Dark matter annihilation in ω Centauri: Astrophysical implications derived from the MWA radio data

被引：5
作者：
Kar, Arpan [1 ]
Mukhopadhyaya, Biswarup [2 ]
Tingay, Steven [3 ]
McKinley, Ben [3 ,4 ]
Haverkorn, Marijke [5 ]
McSweeney, Sam [3 ]
Hurley-Walker, Natasha [3 ]
Mitra, Sourav [6 ]
Choudhury, Tirthankar Roy [7 ]
机构：
[1] HBNI, Harish Chandra Res Inst, Reg Ctr Accelerator Based Particle Phys, Chhatnag Rd, Allahabad 211019, Uttar Pradesh, India
[2] Indian Inst Sci Educ & Res Kolkata, Mohanpur 741246, W Bengal, India
[3] Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia
[4] ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Bentley, WA, Australia
[5] Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands
[6] Surendranath Coll, 24-2 MG Rd, Kolkata 700009, W Bengal, India
[7] TIFR, Natl Ctr Radio Astrophys, Post Bag 3, Pune 411007, Maharashtra, India
来源：
PHYSICS OF THE DARK UNIVERSE | 2020年 / 30卷
基金：
欧洲研究理事会;
关键词：
omega cen; gamma-ray; Dark matter annihilation; Radio observation; MWA;
D O I：
10.1016/j.dark.2020.100689
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present an analysis of Murchison Widefield Array radio telescope data from omega Cen, possibly a stripped dwarf spheroidal galaxy core captured by our Galaxy. Recent interpretations of Fermi-LAT gamma-ray data by Brown et al. (2019) and Reynoso-Cordova et al. (2019) suggest that omega Cen may contain significant Dark Matter. We utilize their best-fit Dark Matter annihilation models, and an estimate of the magnetic field strength in omega Cen, to calculate the expected radio synchrotron signal from annihilation, and show that one can usefully rule out significant parts of the magnetic field-diffusion coefficient plane using our current observational limits on the radio emission. Improvement by a factor of 10-100 on these limits could constrain the models even more tightly. (c) 2020 Elsevier B.V. All rights reserved.
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页数：6
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