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arXiv 1801.09545astro-ph.HE
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用HAWC研究IceCube中微子的河外起源

Constrains on the extragalactic origin of IceCube's neutrinos using HAWC

Ignacio Taboada, Chun Fai Tung, Joshua Wood

摘要:

冰立方发现了一个未解决的和各向同性的中微子通量在10 TeV和8 PeV之间。通常认为这种通量的起源是河外的,并且与宇宙射线的来源有关。到目前为止,还没有与某一类物体建立明确的联系。HAWC是在墨西哥中部运行的一个甚高能(VHE,或$\gtrsim$ 100 GeV)伽马射线观测站。HAWC已经研究了整个天空的2/3($\sim8~sr)$。我们利用这一调查来寻找宇宙射线和中微子的光学薄源,负责冰立方的观测。我们已经编写了一个中微子源的宇宙学性质的模拟,FIRESONG,以表明在某些条件下,HAWC应该观察多个源。然而,HAWC在760天的寿命中只发现了2个河外天体:Mrk 421和Mrk 501。这种在河外天空中探测到的源的不足可以用来限制中微子源的性质,例如它们在局部宇宙中的密度。HAWC限制最多的情况是源密度没有变化,其中至少应该检测到8个物体,因为IceCube尚未排除这些物体。

英文摘要:

IceCube has discovered an unresolved and isotropic flux of neutrinos between 10 TeV and 8 PeV. Extragalactic origin for this flux is usually assumed, as well as a correlation with the sources of cosmic rays. To date, no clear association with a class of objects has been made. HAWC is a very-high-energy (VHE, or $\gtrsim$100 GeV) gamma ray observatory in operation in central Mexico. HAWC has studied 2/3 of the entire sky ($\sim8~sr)$. We use this survey to search for optically thin sources of cosmic rays and neutrinos, responsible for IceCube's observations. We have written a simulation of the cosmological properties of neutrino sources, FIRESONG, to show that under certain conditions, HAWC should be observing multiple sources. However, HAWC has only detected 2 extragalactic objects in 760 days of livetime: Mrk 421 and Mrk 501. This deficiency of detected sources in the extragalactic sky can be used to constrain the properties of neutrino sources, such as their density in the local universe. The case HAWC restricts the most is for no evolution in the density of sources, in which at least 8 objects should have been detected for the cases not excluded already by IceCube.

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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