Evaluation of hadronic emission in starburst galaxies and star-forming galaxies
Evaluation of hadronic emission in starburst galaxies and star-forming galaxies
复制标题
星暴星系和恒星形成星系中强子发射的评估
DOI：
10.1088/1674-14527/21/10/263
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发表时间：
2021
影响因子：
1.8
通讯作者：
Tang Yunyong
中科院分区：
文献类型：
--
作者：
Xiang Yunchuan;Jiang Zejun;Tang Yunyong
在这项工作中，我们重新分析了费米大天区望远镜11年来的光谱数据利用NAIMA提出的单带模型和强子起源理论，对目前观测到的星暴星系（SBG）和恒星形成星系（SFG）的GeV观测数据进行了解释，发现幂次质子的质子分布与SBG和SFG的质子分布有关，而幂次质子的质子分布与SBG和SFG的质子分布有关。具有指数截止的定律形式可以解释绝大多数SBG和SFG的光谱，但不能解释NGC 1068和NGC 4945在GeV能带的光谱硬化成分，因此，我们认为双带模型可以很好地解释这些现象，并总结了两个模型参数的特征，包括光谱指数、截止能量和质子能量收支。类似于银河中超新星遗迹（SNRs）的演化，我们用单区模型估算了SBG内部的质子加速极限为10~2 TeV，这与银河系中SNRs的极限接近。
In this work, we reanalyzed 11 years of spectral data from the Fermi Large Area Telescope(Fermi-LAT)of currently observed starburst galaxies(SBGs)and star-forming galaxies(SFGs).We used a one-zone model provided by NAIMA and the hadronic origin to explain the GeV observation data of the SBGs and SFGs.We found that a protonic distribution of a power-law form with an exponential cutoff can explain the spectra of most SBGs and SFGs.However, it cannot explain the spectral hardening components of NGC1068 and NGC4945 in the GeV energy band.Therefore, we considered the two-zone model to well explain these phenomena.We summarized the features of two model parameters, including the spectral index, cutoff energy, and proton energy budget.Similar to the evolution of supernova remnants(SNRs)in the MilkyWay, we estimated the protonic acceleration limitation inside the SBGs to be the order of 10~2 TeV using the one-zone model;this is close to those of SNRs in the Milky Way.