arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.08397astro-ph.HE
收藏

动态年轻SNR G150 .3+4.5的高能gamma-ray研究

High-energy gamma-ray study of the dynamically young SNR G150.3+4.5

Justine Devin, Marianne Lemoine-Goumard, Marie-Hélène Grondin, Daniel Castro, Jean Ballet, Jamie Cohen, John W. Hewitt

摘要:

超新星遗迹(SNR)G150.3+4.5是最近在射电波段发现的;它呈现出一个角大小为$\sim 3^{\circ}$的壳状形态,这表明它可能是一个古老的或附近的SNR。费米银河系扩展源表(英语:Fermi Galactic Extended Source Catalog)中报告了扩展的$γ$射线辐射,其能量指数为$Γ$ = 1.91 $\pm$ 0.09。通过$γ$射线发射研究SNR中的粒子加速是评估加速粒子的性质和它们可以达到的最大能量的主要关注点。利用十多年的Fermi-LAT数据,我们研究了SNR G150.3+4.5从300 MeV到3 TeV的形态和光谱特性。我们使用最新发布的费米-LAT目录,仪器响应函数和银河系和各向同性漫发射。我们使用ROSAT全天巡天数据来评估任何热和非热X射线发射,我们得出的最小和最大距离G150.3+4.5。我们描述了G150.3+4.5的$γ$射线发射的扩展组件,被发现是空间一致的无线电信噪比。光谱是硬的,并且高达数百GeV的光子的检测点朝向来自动态年轻SNR的发射。X射线发射的缺乏对环境密度$n_0 \leq 3.6 \times 10^{-3}$ cm $^{-3}$给出了严格的约束。由于G150.3+4.5未报告为历史SNR,因此我们对其年龄设定下限为$t$ = 1 kyr。我们估计它的距离在0.7到4.5千秒差距之间。我们发现G150.3+4.5与其他动态年轻和壳型SNR(如RX J1713.7 PDMATHAMT 3946或Vela Junior)在光谱上相似。宽带非热发射解释与轻子的情况下,这意味着下游磁场的$B = 5$ $μ$ G和粒子加速到几TeV的能量。

英文摘要:

The supernova remnant (SNR) G150.3+4.5 was recently discovered in the radio band; it exhibits a shell-like morphology with an angular size of $\sim 3^{\circ}$, suggesting either an old or a nearby SNR. Extended $γ$-ray emission spatially coincident with the SNR was reported in the Fermi Galactic Extended Source Catalog, with a power-law spectral index of $Γ$ = 1.91 $\pm$ 0.09. Studying particle acceleration in SNRs through their $γ$-ray emission is of primary concern to assess the nature of accelerated particles and the maximum energy they can reach. Using more than ten years of Fermi-LAT data, we investigate the morphological and spectral properties of the SNR G150.3+4.5 from 300 MeV to 3 TeV. We use the latest releases of the Fermi-LAT catalog, the instrument response functions and the Galactic and isotropic diffuse emissions. We use ROSAT all-sky survey data to assess any thermal and nonthermal X-ray emission, and we derive minimum and maximum distance to G150.3+4.5. We describe the $γ$-ray emission of G150.3+4.5 by an extended component which is found to be spatially coincident with the radio SNR. The spectrum is hard and the detection of photons up to hundreds of GeV points towards an emission from a dynamically young SNR. The lack of X-ray emission gives a tight constraint on the ambient density $n_0 \leq 3.6 \times 10^{-3}$ cm$^{-3}$. Since G150.3+4.5 is not reported as a historical SNR, we impose a lower limit on its age of $t$ = 1 kyr. We estimate its distance to be between 0.7 and 4.5 kpc. We find that G150.3+4.5 is spectrally similar to other dynamically young and shell-type SNRs, such as RX J1713.7$-$3946 or Vela Junior. The broadband nonthermal emission is explained with a leptonic scenario, implying a downstream magnetic field of $B = 5$ $μ$G and acceleration of particles up to few TeV energies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑