论文标题
在费米 - 拉特检测到的射频星系中搜索类人A的特征
A search for Centaurus A-like features in the spectra of Fermi-LAT detected radio galaxies
论文作者
论文摘要
由于检测到宽银河半人马座A的伽马射线频谱中的硬化，我们分析了26个射电星系的Fermi-LAT观测值约10年，以搜索类似的光谱特征。我们发现，大多数射电星系的伽马射线光谱能量分布最好配备简单的幂律模型，并且没有与检测到半月A中发现的光谱硬化。我们表明，如果我们的射电星系样本中存在任何这样的光谱特征，但会注意到，有7个宽星系（3C 111，3C 120，3C 264，IC 4516，NGC 1218，NGC 1218，NGC 2892和PKS 0625-35）表现出在6 month tayscals septer上的迹象。我们发现5 GHz的核心无线电功率与伽马射线光度之间存在很强的正相关性（r = 0.9），并且使用简单的外推到TEV Energies，我们预计将在即将出现的Cherenkov望远镜阵列中检测到大约一半的射电星系。
Motivated by the detection of a hardening in the gamma-ray spectrum of the radio galaxy Centaurus A, we have analysed ~10 years of Fermi-LAT observations of 26 radio galaxies to search for similar spectral features. We find that the majority of the radio galaxies' gamma-ray spectral energy distributions are best fitted with a simple power-law model, and no spectral hardening similar to that found in Centaurus A was detected. We show that, had there been any such spectral features present in our sample of radio galaxies, they would have been seen, but note that 7 of the radio galaxies (3C 111, 3C 120, 3C 264, IC 4516, NGC 1218, NGC 2892 and PKS 0625-35) show evidence for flux variability on 6-month timescales, which makes the detection of any steady spectral features difficult. We find a strong positive correlation (r = 0.9) between the core radio power at 5 GHz and the gamma-ray luminosity and, using a simple extrapolation to TeV energies, we expect around half of the radio galaxies studied will be detectable with the forthcoming Cherenkov Telescope Array.
