Search for dark matter signals with Fermi-LAT observation of globular clusters NGC 6388 and M 15

Search for dark matter signals with Fermi-LAT observation of globular clusters NGC 6388 and M 15
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通过球状星团 NGC 6388 和 M 15 的 Fermi-LAT 观测寻找暗物质信号

DOI:
10.1088/1475-7516/2012/04/030
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发表时间:
2011-12
影响因子:
6.4
通讯作者:
Mingzhe Li
Mingzhe Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lei Feng;Qiang Yuan;Peng-Fei Yin;Xiao-Jun Bi;Mingzhe Li

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球状星团可能是很好的目标,暗物质(DM)的伽马射线搜索由于可能的绝热收缩的DM重子。本文利用费米大天区望远镜对球状星团NGC 6388和M15三年的观测资料进行分析,寻找可能的DM信号。NGC 6388的伽马射线发射是费米合作组织(Fermi collaboration)报告的,这与毫秒双星的发射是一致的。如果假设湮灭终态是棒上的B(B),则NGC 6388的谱形也与DM贡献一致。M15没有观测到明显的伽马射线发射。本文给出了NGC 6388和M15中湮没末态B(B)在bar、W+W-、mu(+)mu(-)、tau(+)tau(-)和单色线上的DM贡献的上限。这些约束比费米对矮星系的观测结果更强。
The globular clusters are probably good targets for dark matter (DM) searches in gamma-rays due to the possible adiabatic contraction of DM by baryons. In this work we analyse the three-year data collected by Fermi Large Area Telescope of globular clusters NGC 6388 and M 15 to search for possible DM signals. For NGC 6388 the detection of gamma-ray emission was reported by Fermi collaboration, which is consistent with the emission of a population of millisecond pulsars. The spectral shape of NGC 6388 is also shown to be consistent with a DM contribution if assuming the annihilation final state is b (b) over bar. No significant gamma-ray emission from M 15 is observed. We give the upper limits of DM contribution to gamma-ray emission in both NGC 6388 and M 15, for annihilation final states b (b) over bar, W+W-, mu(+)mu(-), tau(+)tau(-) and monochromatic line. The constraints are stronger than that derived from observation of dwarf galaxies by Fermi.
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