0120023

We propose to observe 3C 273 during each of its visibility periods (twice per year) for two long (200 ksec) observations one at the beginning and the other at the end of the period and several short (10 ksec) observations in between. This will provide us with a set of data to investigate the high energy emission of the brightest quasar with unprecedented sensitivity and time sampling from few keV to several MeV.We will study both the Seyfert type emission and the jet related emission. We will see at which energies each of these components dominates and how it varies. We will thus establish the nature of the high energy emission measure the temperature of the Comptonising medium measure the properties of the electrons and positrons in the jet and measure the properties of the MeV spectral break. Our programme will be coordinated with a large multi-wavelength set of observations to relate the high energy components with those observed at lower energies specifically the synchrotron emission of the jet and the blue bump. [truncated! Please see actual data for full text]

我们建议在3C 273的每个可见期（每年两次）内开展观测：在可见期起始与结束时各进行一次长时间观测（200 ksec），期间穿插数次短时间观测（10 ksec）。这将为我们提供一套数据集，以史无前例的灵敏度和时间采样率，研究这一最亮类星体（quasar）在数keV（千电子伏特）至数MeV（兆电子伏特）能段的高能辐射特性。我们将同时研究塞弗特型（Seyfert-type）辐射与喷流（jet）相关辐射，探究这些成分在哪些能段占主导地位及其变化规律。由此，我们将明确高能辐射的本质，测量康普顿化介质（Comptonising medium）的温度，探究喷流中电子与正电子的性质，并测定MeV谱折断的特征。我们的项目将与多波段观测协同开展，以关联高能成分与低能观测到的成分——尤其是喷流的同步辐射（synchrotron emission）和蓝峰（blue bump）。[内容截断！请查阅实际数据获取完整文本]