标题： 球状星团Terzan 2中的康普顿化X射线源X1724-308 显示英文标题

标题： The Comptonized X-ray source X1724-308 in the globular cluster Terzan 2

摘要： 我们报告了BeppoSAX对球状星团Terzan 2中X射线源X1724-308的观测结果。 宽带光谱可以被描述为一个幂律（光子谱指数为1.6-1.9）与一个典型温度约为1 keV的热成分的叠加。 尽管在约90 keV处有一个陡峭的指数截止，X1724-308在PDS中被探测到高达150 keV，信噪比>3。 宽带光谱最好解释为由kT ~1 keV的维恩光子分布通过电子温度~30 keV且光学深度~3的球对称高温等离子体的康普顿化所致。 与EXOSAT观测到的较弱且更陡的状态相比，这表明康普顿化电子分布（或等离子体光学深度）的温度与X射线强度之间存在相关性。 X射线热成分可能起源于吸积盘与致密天体之间的边界层，或者是吸积盘本身。 显示英文摘要

摘要： We report on the BeppoSAX observation of the X-ray source X1724-308 in the globular cluster Terzan 2. The broadband spectrum can be described as the superposition of a power-law with photon spectral index 1.6-1.9 and a thermal component with typical temperature ~1 keV. X1724-308is detected in the PDS up to 150 keV with a S/N ratio >3, notwithstanding a sharp exponential cutoff at \~90 keV. The broadband spectrum can be best interpreted as due to the Comptonization of a Wien photon distribution with kT ~1 keV by a spherically-symmetric hot plasma with electron temperature ~30 keV and optical depth ~3. A comparison with the fainter and steeper state, which was observed by EXOSAT, suggests a correlation between the temperature of the Comptonizing electron distribution (or the plasma optical depth) and the X-ray intensity. The X-ray thermal component could originate from a boundary layer between the accretion disk and the compact object, or from the accretion disk itself.