Millisecond pulsar interpretation of the Galactic center gamma-ray excess

Millisecond pulsar interpretation of the Galactic center gamma-ray excess
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银河系中心伽马射线过剩的毫秒脉冲星解释

DOI:
10.1016/j.jheap.2014.06.001
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发表时间:
2014-04
影响因子:
3.8
通讯作者:
Zhang, Bing
Zhang, Bing
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yuan, Qiang;Zhang, Bing

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在费米-LAT数据中发现,在银河系中心区域有一个扩展的γ射线过剩。提出的造成过量的来源包括暗物质湮灭或来自毫秒双星(MSP)群体的天体物理替代品。MSP方案是否可以解释的数据自洽的粒子暗物质的检测,这是非常重要的影响,然而,在文献中有争议。在这项工作中,我们研究了MSP的情况下,详细的基础上检测到的属性的MSP费米-LAT。我们构造了一个能再现观测到的Fermi-LAT MSPs的γ射线性质的银河系盘成分MSPs模型,并导出了MSPs的内禀光度函数。然后将该模型应用于MSP的膨胀人口。我们发现,扩展的γ射线过剩可以很好地解释由凸起的MSP不违反可检测的通量分布的MSPs的费米LAT。由低质量X射线双星的分布所暗示的核球MSP的空间分布遵循r− 2.4的分布,这也与γ射线过剩数据一致。我们的结论是,MSP模型可以解释银河系中心的γ射线过剩自洽,满足所有目前的观测约束。
It was found in the Fermi-LAT data that there is an extended γ-ray excess in the Galactic center region. The proposed sources to be responsible for the excess include dark matter annihilation or an astrophysical alternative from a population of millisecond pulsars (MSPs). Whether or not the MSP scenario can explain the data self-consistently has very important implications for the detection of particle dark matter, which is however, subject to debate in the literature. In this work we study the MSP scenario in detail, based on the detected properties of the MSPs by Fermi-LAT. We construct a model of Milky Way disk-component MSPs which can reproduce the γ-ray properties of the observed Fermi-LAT MSPs, and derive the intrinsic luminosity function of the MSPs. The model is then applied to a bulge population of MSPs. We find that the extended γ-ray excess can be well explained by the bulge MSPs without violating the detectable flux distribution of MSPs by Fermi-LAT. The spatial distribution of the bulge MSPs as implied by the distribution of low mass X-ray binaries follows a r− 2.4 profile, which is also consistent with the γ-ray excess data. We conclude that the MSP model can explain the Galactic center γ-ray excess self-consistently, satisfying all the current observational constraints.
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