标题： 用INTEGRAL观测微类星体的高能辐射 显示英文标题

标题： Observation of microquasars high-energy emission with INTEGRAL

摘要： 微类星体是黑洞X射线双星（BHXB），它们能够以双极喷流的形式喷射物质，类似于类星体，但规模小得多。 其高能辐射来自吸积盘（~1 keV）以及靠近黑洞的高温“冕”，后者将盘中的光子上康普顿散射到硬X射线域（1–100 keV）。 在明亮源中检测到了高于150 keV的高能成分，但其确切起源仍未知：它可能来自盘光子在冕相对论非热电子上的康普顿散射（即混合康普顿化），或者来自紧凑喷流最底部的同步辐射。 测量高于150 keV的偏振可以为所涉及的过程提供有价值的见解，因为我们预计由于喷流的同步辐射，偏振分数会更高（在非常有序的磁场下可高达70%）。 我们使用INTEGRAL/IBIS望远镜来测量蟹状星云和BHXB Swift J1727.8-1613的软伽马射线偏振。 显示英文摘要

摘要： Microquasars are Black Hole X-ray binaries (BHXB) which can eject material in the form of a bipolar jet, similarly to quasars, but at much smaller scales. Their high-energy emission comes from an accretion disk (~ 1 keV) and from a hot "corona" near the black hole that up-scatters photons from the disk in the hard X-ray domain (1--100 keV). A high-energy component above 150 keV has been detected in bright sources and its precise origin is still unknown: it could come either from Compton scattering of disk photons on coronal relativistic non-thermal electrons (a.k.a hybrid Comptonization), or from the synchrotron emission from the very base of the compact jet. The measurement of polarization above 150 keV can provide valuable insights into the processes at play as we expect higher polarization fraction due to synchrotron emission from the jets (up to 70 % with a very ordered magnetic field). We use the INTEGRAL/IBIS telescope to measure the soft gamma-ray polarization of the Crab Nebula and the BHXB Swift J1727.8-1613.