论文标题
在15 GEV以外的幂律尾部发射的魔法提示中检测geminga脉冲星的检测
Detection of the Geminga pulsar with MAGIC hints at a power-law tail emission beyond 15 GeV
论文作者
论文摘要
我们报告了从$ 15 \,$ gev和$ 75 \,$ gev中发现了从Geminga Pulsar(PSR J0633+1746)中检测到脉冲伽马射线排放的。这是第一次检测到这些能量的中年脉冲星。使用低能阈值Sum-Trigger-II系统在2017年至2019年之间使用魔术望远镜进行观察。削减质量选择后,$ \ sim 80 \,使用$小时的观察数据进行此分析。为了与低于魔术灵敏度范围的较低能量的排放相比,还分析了$ 11 $年的费米 - 拉特数据数据,还分析了$ MEV。从费米 - 拉特(Fermi-Lat)看到的每旋转的两个脉冲中,仅在魔术能量范围内检测到第二个脉冲,其中第二个脉冲是在魔术能量范围内检测到的,其显着性为$ 6.3 \,σ$。通过魔术测量的光谱是通过光谱指数$γ= 5.62 \ pm0.54 $的简单功率定律很好地代表的,该定律平稳地扩展了费米 - 拉特光谱。与魔术和费米 - 拉特数据相关的关节排除了在$ 3.6 \,σ$显着性水平的合并能量范围内的次指数截止。魔术检测到的幂律尾部发射被解释为从曲率辐射到北部外部缝隙加速的颗粒的反向comp散射的过渡。
We report the detection of pulsed gamma-ray emission from the Geminga pulsar (PSR J0633+1746) between $15\,$GeV and $75\,$GeV. This is the first time a middle-aged pulsar has been detected up to these energies. Observations were carried out with the MAGIC telescopes between 2017 and 2019 using the low-energy threshold Sum-Trigger-II system. After quality selection cuts, $\sim 80\,$hours of observational data were used for this analysis. To compare with the emission at lower energies below the sensitivity range of MAGIC, $11$ years of Fermi-LAT data above $100\,$MeV were also analysed. From the two pulses per rotation seen by Fermi-LAT, only the second one, P2, is detected in the MAGIC energy range, with a significance of $6.3\,σ$. The spectrum measured by MAGIC is well-represented by a simple power law of spectral index $Γ= 5.62\pm0.54$, which smoothly extends the Fermi-LAT spectrum. A joint fit to MAGIC and Fermi-LAT data rules out the existence of a sub-exponential cut-off in the combined energy range at the $3.6\,σ$ significance level. The power-law tail emission detected by MAGIC is interpreted as the transition from curvature radiation to Inverse Compton Scattering of particles accelerated in the northern outer gap.