Parkes observations for project P427 semester 2012APRS

Timing of the dozen pulsars discovered by us in P303 is ensuring high quality results: (a) the peculiarities (in position or projected acceleration) of all the 5 millisecond pulsars in NGC6752 suggested the presence of non thermal dynamics in the core, perhaps due to black-holes of intermediate mass; (b) the eclipsing pulsar in NGC6397 is a stereotype for studying the late evolution of exotic binaries. We propose to continue our timing project focusing mostly on NGC6752 at 20cm (in order to measure additional parameters useful to constrain the existence of a black-hole) and NGC6397 at 10cm (for studying the orbital secular evolution, the eclipse region, and the mechanisms leading to the ejection of matter from the binary system).

我们在P303项目中发现的12颗脉冲星的计时观测可保障获得高质量的观测结果：(a) NGC 6752内全部5颗毫秒脉冲星（millisecond pulsar）的位置与投影加速度特征，表明其核心存在非热动力学过程，该现象或由中等质量黑洞引发；(b) NGC 6397中的食脉冲星（eclipsing pulsar）是研究奇异双星系统晚期演化的标准参照样本。我们提议继续推进计时观测项目，主要聚焦于20厘米波段下的NGC 6752（以测量额外参数，用于约束中等质量黑洞的存在），以及10厘米波段下的NGC 6397（用于研究轨道长期演化、食区以及导致双星系统物质抛射的物理机制）。