论文标题

最具发光和最巨大的超级矮星系(UCD)中的暗物质歼灭

Dark matter Annihilation in the Most Luminous and the Most Massive Ultracompact Dwarf Galaxies (UCD)

论文作者

Fortes, Elaine C. F. S., Miranda, Oswaldo D., Stecker, Floyd W., Wuensche, Carlos A.

论文摘要

在本文中,我们探讨了超紧凑型矮星系中暗物质(DM)歼灭的潜在天体特征(UCDS),考虑了两个在1亿光年内,名义上,处女座和Fornax,考虑了两个最丰富的已知星系簇。 Fornax UCD3是最发光的UCD,M59 UCD3是最众所周知的UCD。考虑到Fornax UCD3中有350万个太阳能黑洞(BH),我们仔细地对几个暗物质(DM)增强的轮廓场景进行了建模,考虑到存在超级质量黑洞(SMBH)和DM。对于Fornax UCD3,恒星和动态质量的比较表明UCD中的DM含量很少。 M59 UCD3在模拟中没有与FORNAX UCD3受到相同的关注,但是对M59 UCD3进行了深度无线电成像和X射线观测值,可用于将这些UCD的DM含量限制。我们进行暗物质含量的平均估计值,并使用了Salpeter和Kroupa质量功能。我们对Fornax UCD3和M59 UCD3进行建模,以具有这些质量函数的平均值的DM含量。然后,我们分析了来自$γ$ ray和无线电源的Fornax和M59 UCD3的约束,考虑到我们的模拟中的质量在10至34 GEV之间的暗物质粒子。在没有强大的$γ$射线签名的情况下,我们表明由DM歼灭产生的电子和正电子的同步子发射可能对间接DM搜索非常敏感。我们发现,在无线电频率下,DM参数可以显着限制,并且尖峰曲线在深入研究超紧凑型星系中DM和BH相互作用的增强中起着有趣的作用。

In this paper, we explore the potential astrophysical signatures of dark matter (DM) annihilations in ultra-compact dwarf galaxies (UCDs) considering two of the richest known galaxy clusters within 100 million light-years, nominally, Virgo and Fornax. Fornax UCD3 is the most luminous known UCD and M59 UCD3 is the most massive known UCD. With the detection of a 3.5 million solar mass black hole (BH) in Fornax UCD3, we carefully model several dark matter (DM) enhanced profile scenarios, considering the presence of both a supermassive black hole (SMBH) and DM. For Fornax UCD3, the comparison of the stellar and dynamical masses suggests that there is little content of DM in UCDs. M59 UCD3 did not receive the same attention in simulations as Fornax UCD3, however deep radio imaging and X-ray observations were performed for M59 UCD3 and can be used to place limits in DM content of these UCDs. We take an average estimate of dark matter content and used the Salpeter and Kroupa mass functions. We model Fornax UCD3 and M59 UCD3 to have a DM content that is the average of these mass functions. We then analyze the constraints for Fornax and M59 UCD3 coming from $γ$-ray and radio sources, considering a dark matter particle with a mass between 10 and 34 GeV in our simulations. In the absence of a strong $γ$-ray signature, we show that the synchrotron emission from electrons and positrons produced by DM annihilations can be very sensitive to indirect DM search. We find that DM parameters can be significantly constrained at radio frequencies and that the spike profiles play an interesting role in the deep study of the enhancements of DM & BH interactions in ultra-compact galaxies.

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