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arXiv 2011.08917hep-phastro-ph.GAastro-ph.HE
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超暗矮星系中暗物质湮灭的Gamma-ray和同步辐射

Gamma-ray and Synchrotron Radiation from Dark Matter annihilations in Ultra-faint Dwarf Galaxies

Pooja Bhattacharjee, Debajyoti Choudhury, Kasinath Das, Dilip Kumar Ghosh, Pratik Majumdar

摘要:

适用于超暗矮星系(UFD)的非常大(100-1000)的质光比意味着高浓度的暗物质,从而使它们成为暗物质间接特征的理想剧院。在本文中,我们考虑了14个最近发现的UFD和研究从他们发出的电磁辐射在很宽的范围内,从伽马射线下降到射频。我们分析了高能γ射线和射电通量在GMRT和VLA的费米LAT数据,以获得湮灭截面的上限$\langleσv\rangle$在一个模型无关的方式。我们进一步讨论了平方公里阵列射电望远镜探测上述UFD的同步辐射的灵敏度。我们还研究了上述上限对各种天体物理参数测定中的不确定度的依赖性。

英文摘要:

The very large (100-1000) mass-to-light ratio applicable to the ultra-faint dwarf galaxies (UFDs) implies a high concentration of dark matter, thus rendering them ideal theatres for indirect signatures of dark matter. In this paper, we consider 14 recently discovered UFDs and study the electromagnetic radiation emanating from them over a wide range, from gamma ray down to radio frequencies. We analyze the Fermi-LAT data on high energy gamma rays and radio fluxes at the GMRT and VLA to obtain upper limits on annihilation cross section $\langleσv\rangle$ in a model independent way. We further discuss the sensitivity of the Square Kilometer Array radio telescope in probing the synchrotron radiation from the aforementioned UFDs. We also investigate the dependences of the said upper limits on the uncertainties in the determination of various astrophysical parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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