Neutrino Observations of LHAASO Sources: Present Constraints and Future Prospects
Neutrino Observations of LHAASO Sources: Present Constraints and Future Prospects
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DOI：
10.1093/mnras/stac1350
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
Tianchi Huang;Zhuo Li
中科院分区：
文献类型：
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作者：
Tianchi Huang;Zhuo Li
大型高空空气簇射天文台(LHAASO)观测到了十几个显著辐射在100TeV以上的伽马射线源，它们可能是PeVatrons的有力候选者。中微子观测对于诊断伽马射线辐射过程是强子过程还是轻子过程至关重要。我们使用贝叶斯方法分析了十年(2008-2018年)冰立方数据，从而约束了LHAASO源中的强子伽马射线发射。目前的中微子数据表明，蟹状星云的强子伽马射线通量低于90%C.L.的观测伽马射线通量，贡献不到86%，这不利于伽马射线在数十TeV以下的强子起源。对于其他LHAASO源，目前的中微子观测不能对伽马射线辐射过程施加有用的约束。我们考虑了源扩展的不确定性：强子伽马射线通量的上限随扩展而增加，一些源，即LHAASO J2032+4102、LHAASO J1929+1745和LHAASO J1908+0621，在20年内用有效面积是冰立方30倍的中微子探测器在3-sigma C.L.上扩展100TeV时，显示出较高的中微子信号统计意义。
The Large High Altitude Air Shower Observatory (LHAASO) observed a dozen of gamma-ray sources with significant emission above 100 TeV, which may be strong candidates of PeVatrons. Neutrino observations are crucial to diagnose whether the gamma-ray radiative process is hadronic or leptonic. We use the Bayesian method to analyze the ten-year (2008-2018) IceCube data, and hence constrain the hadronic gamma-ray emission in the LHAASO sources. The present neutrino data show that the hadronic gamma-ray flux from Crab Nebula is lower than the observed gamma-ray flux at the 90% C.L. and contributes less than 86%, which disfavors the hadronic origin of the gamma-rays below tens of TeV. For the other LHAASO sources, the present neutrino observations cannot put useful constraints on the gamma-ray radiative process. We consider the uncertainty of the source extension: the upper limits on hadronic gamma-ray flux tend to increase with the extension; and some sources, i.e., LHAASO J2032+4102, LHAASO J1929+1745, and LHAASO J1908+0621, show relatively high statistical significance of neutrino signals if the extension is100 TeV at 3-sigma C.L. within 20 years by a neutrino detector with the effective area 30 times that of IceCube.