Revisiting the Spectral Energy Correlations of GRBs with Fermi Data. I. Model-wise Properties
Revisiting the Spectral Energy Correlations of GRBs with Fermi Data. I. Model-wise Properties
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DOI：
10.3847/1538-4365/acc867
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发表时间：
2022-11
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通讯作者：
Liang Li
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作者：
Liang Li
伽玛射线暴（GRBs）表现出光谱的多样性。几种光谱模型（如波段、截止幂律（CPL）和黑体）及其混合模型（如波段+黑体）已被广泛用于拟合观测到的GRB光谱。在这里，我们试图收集2008年7月至2022年5月期间由费米/GBM探测到的所有已知红移的爆发，其动机是(i)提供一个独立于官方费米/GBM团队的参数目录，（ii）实现一个“干净”的基于模型的GRB光谱能量相关性分析。一个几乎完整的GRB样本被创建，包含153个这样的爆发（136个长GRB和17个短GRB）。利用样品并进行详细的光谱分析和模型比较，我们研究了两种GRB光谱能量相关性：ν F ν prompt发射光谱的宇宙学静帧峰值能量（E p,z）与(i)各向同性-热计量等效发射能量E γ，iso （Amati关系）和（ii）各向同性-热计量等效峰值光度L p，iso （Yonetoku关系）的相关性。从线性回归分析中发现，对于类带和类cpls爆发（除了类cpls长爆发exp，z -E γ，iso相关），exp，z和E γ，iso之间存在紧密相关性。更有趣的是，类cpld爆发并不落在类带爆发的Amati和Yonetoku相关性上，这表明了不同的辐射过程，并指出了这些光谱能量相关性紧密依赖于模型属性的事实。
Gamma-ray bursts (GRBs) exhibit a diversity of spectra. Several spectral models (e.g., Band, cutoff power law (CPL), and blackbody) and their hybrid versions (e.g., Band+blackbody) have been widely used to fit the observed GRB spectra. Here, we attempt to collect all the bursts detected by Fermi/GBM with known redshifts from 2008 July to 2022 May, having been motivated to (i) provide a parameter catalog independent of the official Fermi/GBM team and (ii) achieve a “clean” model-based GRB spectral energy correlation analysis. A nearly complete GRB sample is created, containing 153 such bursts (136 long GRBs and 17 short GRBs). Using the sample and by performing detailed spectral analysis and model comparisons, we investigate two GRB spectral energy correlations: the correlation of the cosmological rest-frame peak energy (E p,z ) of the ν F ν prompt emission spectrum with (i) the isotropic-bolometric-equivalent emission energy E γ,iso (the Amati relation) and (ii) the isotropic-bolometric-equivalent peak luminosity L p,iso (the Yonetoku relation). From a linear regression analysis, a tight correlation between E p,z and E γ,iso (and L γ,iso) is found for both Band-like and CPL-like bursts (except for CPL-like long burst E p,z –E γ,iso correlation). More interestingly, CPL-like bursts do not fall on the Band-like burst Amati and Yonetoku correlations, suggesting distinct radiation processes, and pointing to the fact that these spectral energy correlations are tightly reliant on the model-wise properties.