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arXiv 1909.01773astro-ph.HE
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对“理解来自球状星团47 Tuc的gamma-ray发射:暗物质的证据?'

Reply to a comment on `Understanding the gamma-ray emission from the globular cluster 47 Tuc: evidence for dark matter?'

Anthony M. Brown, Thomas Lacroix, Sheridan Lloyd, Celine Boehm, Paula Chadwick

摘要:

通过分析9年的费米-LAT观测,我们最近研究了著名的球状星团47 Tuc的光谱特性(Brown et al. 2018)。特别是,我们研究了几种模型来解释观测到的伽马射线发射,从毫秒级双星(MSP)到暗物质(DM),后者模型的动机是最近的证据表明,47 Tuc拥有一个中等质量的黑洞(IMBH)。这项调查发现的证据表明,从47 Tuc观测到的伽马射线发射是由于两个源人口的MSP和DM。在Bartels \& Edwards(2018)中,作者评论说,这一证据是(Brown et al. 2019)中使用的MSP光谱的伪影。在这里,我们回答这个评论,并认为Bartels \& Edwards(2018)的作者(i)没有适当考虑他们结果的一个非常重要的含义,(ii)在考虑不确定性时,我们的MSP拟合和他们的MSP拟合之间存在紧张关系。因此,我们仍然得出结论,有证据表明DM组件,激发了更深入的无线电研究的突出球状星团47 Tuc。

英文摘要:

Analysing 9 years of Fermi-LAT observations, we recently studied the spectral properties of the prominent globular cluster 47 Tuc (Brown et al. 2018). In particular, we investigated several models to explain the observed gamma-ray emission, ranging from millisecond pulsars (MSP) to Dark Matter (DM), with the motivation for the latter model driven by recent evidence that 47 Tuc harbours an intermediate-mass black hole (IMBH). This investigation found evidence that the observed gamma-ray emission from 47 Tuc is due to two source populations of MSPs and DM. In Bartels \& Edwards (2018), the authors comment that this evidence is an artifact of the MSP spectra used in (Brown et al. 2019). Here we reply to this comment and argue that the authors of Bartels \& Edwards (2018) (i) do not give due consideration to a very important implication of their result and (ii) there is tension between our MSP fit and their MSP fit when taking uncertainties into consideration. As such, we still conclude there is evidence for a DM component which motivates a deeper radio study of the prominent globular cluster 47 Tuc.

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