论文标题
研究Lhaaso J1908+0621的辐射特性
Investigating the radiative properties of LHAASO J1908+0621
论文作者
论文摘要
Lhaaso J1908+0621最近被检测为发射$γ$的来源，其能量高于100 TEV，而多频道观察结果表明，在$γ$ -Ray频谱中出现了1个TEV的突破。我们使用费米大面积望远镜（Fermi-lat）记录的100年数据重新分析了100 TEV源的GEV $γ$ ray属性。能源范围30-500 GEV的频谱的索引为1.50 $ \ pm $ 0.26，比TEV $γ$ -rays中检测到的频谱小得多。另外，根据单区时间依赖性模型研究了该来源的辐射特性。在模型中，Lhaaso J1908+0621与Pulsar PSR J1907驱动的Pulsar Wind Nebula（PWN）相关联。由电子和正电子组成的高能颗粒被注入星云。多播非热发射是通过同步加速器辐射和反康普顿散射（ICS）产生的。考虑到辐射能量损失和绝热冷却的影响，模型的光谱能量分布损坏了，可以解释注射颗粒的分布，可以解释$γ$ ray频段中检测到的通量。结果支持LHAASO J1908+0621源自PSR J1907 $+$ 0602的PWN，以及能量以上TEV以上的$γ$ rays由Nebula通过ICS中的Nebula Electrons/pocitrons生产。
LHAASO J1908+0621 has been recently detected as a source emitting $γ$-rays with energies above 100 TeV, and the multiband observations show that a break around 1 TeV appears in the $γ$-ray spectrum. We have reanalyzed the GeV $γ$-ray properties for the 100 TeV source using 14 years of data recorded by the Fermi Large Area Telescope (Fermi-LAT). The spectrum in the energy range range 30-500 GeV has an index of 1.50 $\pm$ 0.26, which is much smaller than that detected in the TeV $γ$-rays. Additionally, the radiation properties of this source are investigated based on a one-zone time-dependent model. In the model, LHAASO J1908+0621 is associated with a pulsar wind nebula (PWN) powered by the pulsar PSR J1907$+$0602. High-energy particles composed of electrons and positrons are injected into the nebula. Multiband nonthermal emission is produced via synchrotron radiation and inverse Compton scattering (ICS). Taking the effect of radiative energy losses and adiabatic cooling into account, the spectral energy distribution from the model with a broken power-law for the distribution of the injected particles can explain the detected fluxes in the $γ$-ray bands. The results support that LHAASO J1908+0621 originates from the PWN powered by PSR J1907$+$0602, and the $γ$-rays with energy above 100 TeV are produced by the electrons/positrons in the nebula via ICS.
