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arXiv 1606.02548astro-ph.GAastro-ph.SR
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天空中的偶极:从大麦云云预测超高速恒星

A Dipole on the Sky: Predictions for Hypervelocity Stars from the Large Magellanic Cloud

Douglas Boubert, N. W. Evans

摘要:

在假设矮星系中心有一个大质量黑洞的前提下,我们预测了从大麦云(LMC)中喷出的超高速星(HVS)的分布。对于大多数从大麦哲伦星系抛射出来的恒星来说,大麦哲伦星系的轨道速度占了它们银河系静止帧速度的很大一部分,导致天空中的偶极密度分布。我们量化的偶极子使用球谐分析和对比与预期的HVS从银河系中心喷出。在LMC的密度分布中有一个卷须,这与狮子座和六分仪座中众所周知的无法解释的HVS集群相一致。我们的模型是可证伪的,因为它预测盖亚将在南半球揭示大密度的HVS。

英文摘要:

We predict the distribution of hypervelocity stars (HVSs) ejected from the Large Magellanic Cloud (LMC), under the assumption that the dwarf galaxy hosts a central massive black hole (MBH). For the majority of stars ejected from the LMC the orbital velocity of the LMC has contributed a significant fraction of their galactic rest frame velocity, leading to a dipole density distribution on the sky. We quantify the dipole using spherical harmonic analysis and contrast with the monopole expected for HVSs ejected from the Galactic Center. There is a tendril in the density distribution that leads the LMC which is coincident with the well-known and unexplained clustering of HVSs in the constellations of Leo and Sextans. Our model is falsifiable, since it predicts that Gaia will reveal a large density of HVSs in the southern hemisphere.

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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