耀变体的逆康普顿峰值频率与伽马光子谱指数的关系

The Relationship between the Inverse Compton Peak Frequency and the γ-ray Photon Spectral Index for Blazars

以Fermi/LAT(Large Area Telescope)12yr观测的第4期源表的第3次修订版(The 4th Fermi Gamma-ray LAT-Data Release 3,4FGL-DR3)中的blazar为样本,研究了blazar不同子类的逆康普顿峰频(lgν_(p)^(IC))与γ-ray光子谱指数(Γ)之间关系.结果表明:所有blazar子类样本的lgν_(p)^(IC)与Γ都有强的负相关关系,即γ-ray光子谱指数对blazar的逆康普顿能谱有强的主导作用,并且可用二者之间的关系快速地估计逆康普顿峰频;不同blazar子类样本的逆康普顿部分的能谱分布应该有不同的谱结构函数,因此,对于不同的样本,应该采用不同的函数拟合其能谱分布.

The relationship between the inverse Compton peak frequency(lgν_(p)^(IC))andγ-ray photon spectral index(Γ)for different subclasses of blazars was studied using Fermi/LAT(Large Area Telescope)4FGL-DR3(The 4th Fermi Gamma-ray LAT-Data Release 3)blazars as a sample.The results show that:there is a strong negative correlation between lgν_(p)^(IC) and Γ for all subclass samples of blazars,indicating that theγ-ray photon spectral index has a strong dominant effect on the inverse Compton spectrum of blazars,and the inverse Compton peak frequency can be quickly estimated using the relationship between them.The energy spectrum distribution(SED)of the inverse Compton emission for different subclass sample of blazars may have different spectral structure functions.Therefore,for different samples,different functions should be used tofit their SED.