论文标题
具有暗物质及其对暗物质an灭的巨大球形簇的形成
Formation of massive globular clusters with dark matter and its implication on dark matter annihilation
论文作者
论文摘要
最近对大量球状簇（GC）排放$γ$射线的观察性研究表明，GCS内可能存在暗物质（DM）歼灭的证据。但是，无论发射来自DM还是来自Milli秒的脉冲星，仍然存在争议。我们在这里提出了数值模拟的新结果，这些结果表明，具有DM的GC可以源自绕古代MW的成核矮人。模拟的剥离核（即GCS）的中央DM密度范围从0.1到几个$ {\ rm m_ \ odot pc^{ - 3}} $，取决于宿主和宿主的质量。但是，出生于主人中央地区以外的GC在宿主被摧毁并且GC成为银河系Halo GC之后，无法拥有/小型DM。这些结果表明，只有源自矮人的恒星核的GC可以具有DM。我们进一步计算了这些模拟GC的预期$γ$ ray排放，并将它们与$ω$ CEN的观察结果进行了比较。鉴于模拟GC中的DM密度范围很大，我们建议应更仔细地解释最近可能检测到GCS的DM an灭。
Recent observational studies of $γ$-ray emission from massive globular clusters (GCs) have revealed possible evidence of dark matter (DM) annihilation within GCs. It is, however, still controversial whether the emission comes from DM or from milli-second pulsars. We here present the new results of numerical simulations, which demonstrate that GCs with DM can originate from nucleated dwarfs orbiting the ancient MW. The simulated stripped nuclei (i.e., GCs) have the central DM densities ranging from 0.1 to several ${\rm M_\odot pc^{-3}}$, depending on the orbits and the masses of the host dwarf galaxies. However, GCs born outside the central regions of their hosts can have no/little DM after their hosts are destroyed and the GCs become the Galactic halo GCs. These results suggest that only GCs originating from stellar nuclei of dwarfs can possibly have DM. We further calculate the expected $γ$-ray emission from these simulated GCs and compare them to observations of $ω$ Cen. Given the large range of DM densities in the simulated GCs, we suggest that the recent possible detection of DM annihilation from GCs should be more carefully interpreted.
