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中发现的12颗脉冲星的计时观测正确保着高质量结果：(a) NGC6752中所有5颗毫秒脉冲星（millisecond pulsar）的特性（如位置或投影加速度）表明其核心存在非热动力学过程（non-thermal dynamics），这或许由中等质量黑洞（intermediate-mass black hole）所致；(b) NGC6397中的掩食脉冲星（eclipsing pulsar）是研究奇特双星（exotic binaries）晚期演化的典型样本。我们提议继续开展计时观测项目，重点针对NGC6752进行20厘米波段观测（以测量更多有助于限制黑洞存在的参数），以及针对NGC6397进行10厘米波段观测（以研究轨道长期演化（orbital secular evolution）、掩食区域（eclipse region）及导致物质从双星系统中喷流的机制）。