发表机构
College of Physics and Electronics information, Yunnan Normal University; Department of Astronomy, School of Physics and Astronomy, Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University; Liupanshui Normal College; State-owned Assets and Laboratory Management Office, Yunnan Normal University（云南师范大学物理与电子科学学院; 云南大学物理与天文学院天文学系; 六盘水师范学院; 云南师范大学国有资产管理处）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究分析八个费米GBM伽马射线暴，发现显著准热黑体成分，并通过光球层模型反演对喷流发射半径和效率给出条件性约束。
AI 中文摘要
伽马射线暴（GRB）喷流的组成仍不确定。我们分析了八个具有报告红移信息的费米伽马射线暴监测仪（GBM）GRB，这些事件是从126个事件中根据预设的注量和光谱标准选出的。在排除了后验稳定性测试判定为不稳定的复合模型DIC评估后，稳定的附加黑体（BB）比较在215个接受的时间片中有203个给出ΔDIC>10（每个暴60–100%）；独立地，多色黑体加幂律（mBB+PL）分解在215个时间片中有214个给出F_mBB/F_tot>0.5。截断幂律（CPL）与mBB的相关性（r=0.83和0.78）超过了Band与mBB的相关性（r=0.41和0.48），显示了模型依赖性。时间积分BB分数范围在0.005–0.311之间，八个中有六个低于0.12。然后我们应用了H2013和G2015的非耗散光球层方案。在排除边界或物理上不可行的反演后，在R0=21、100和1000 km的有效解中，ε_Th>0.5的H2013数字分别为1/2、1/4和2/8；相应的σ0<1的G2015数字为0/1、1/4和1/8。在小R0处的大量无效解（H2013和G2015在21 km处分别为六个和七个）本身表明，对于大多数事件，这些假设半径与所采用的反演不相容。在多个半径具有有效解的暴中，增加R0通常会降低ε_Th并提高σ0。因此，发射半径、效率和光谱分解主导了条件性喷流约束；没有推断出普遍的喷流类别或独特的非热机制。
英文摘要
The composition of gamma-ray burst (GRB) jets remains uncertain. We analyze eight Fermi Gamma-ray Burst Monitor (GBM) GRBs with reported redshift information, selected from 126 events by prespecified fluence and spectral criteria. After excluding compound-model DIC evaluations classified as unstable by the posterior-stability tests, a stable added-blackbody (BB) comparison gives $Δ\mathrm{DIC}>10$ in 203 of 215 accepted bins (60--100\% per burst); independently, a multicolor-blackbody plus power-law (mBB+PL) decomposition gives $F_{\rm mBB}/F_{\rm tot}>0.5$ in 214 of 215 bins. The cutoff-power-law (CPL)--mBB correlations ($r=0.83$ and 0.78) exceed the Band--mBB correlations ($r=0.41$ and 0.48), demonstrating model dependence. Time-integrated BB fractions span 0.005--0.311, with six of eight below 0.12. We then apply the non-dissipative photosphere prescriptions of \citet{2013A&A...551A.124H} (H2013) and \citet{2015ApJ...801..103G} (G2015). After excluding boundary or physically inadmissible inversions, the H2013 numbers with $ε_{\rm Th}>0.5$ are 1/2, 1/4, and 2/8 among valid solutions at $R_0=21$, 100, and 1000~km, respectively; the corresponding G2015 numbers with $σ_0<1$ are 0/1, 1/4, and 1/8. The large number of invalid solutions at small $R_0$ (six and seven at 21~km for H2013 and G2015) is itself evidence that those assumed radii are incompatible with the adopted inversion for most events. Among bursts having valid solutions at more than one radius, increasing $R_0$ generally lowers $ε_{\rm Th}$ and raises $σ_0$. Thus launch radius, efficiency, and spectral decomposition dominate the conditional jet constraints; no universal jet class or unique non-thermal mechanism is inferred.
Comments23 pages, 8 figures, 6 tables,accepted for publication in ApJ
