我们利用帕克斯20厘米多波束系统沿北银道面（$50^{\circ} < l < 60^{\circ}$和$|b| \lapp 2^{\circ}$）进行了一次灵敏的射电脉冲星巡天。我们在两个独立的时期观察每个位置70分钟。迄今为止，我们的分析已经发现了32个卫星，其中17个以前未知。在这里，我们总结了观测和分析，并提出了11颗双星的定时观测和另外6颗双星的发现参数。我们还提出了一个166毫秒爆发脉冲星，PSR~J1938+2213，以前发现在阿雷西博漂移扫描调查的时间解决方案。观测数据表明，该脉冲星的辐射可以用一个稳定的脉冲分量和一个典型的20- 25个脉冲周期的爆发辐射叠加来描述。其他新发现的是年轻的80.1-ms脉冲星PSR~J1935+2025，它在其定时残差中显示出大量未建模的低频噪声，以及4.2-ms脉冲星PSR~J1935+1726，它是一个低质量双星系统，具有90.7天的圆轨道。
英文摘要：
We have carried out a sensitive radio pulsar survey along the northern Galactic plane ($50^{\circ} < l < 60^{\circ}$ and $|b| \lapp 2^{\circ}$) using the Parkes 20-cm multibeam system. We observed each position for 70-min on two separate epochs. Our analyses to date have so far resulted in the detection of 32 pulsars, of which 17 were previously unknown. Here we summarize the observations and analysis and present the timing observations of 11 pulsars and discovery parameters for a further 6 pulsars. We also present a timing solution for the 166-ms bursting pulsar, PSR~J1938+2213, previously discovered during an Arecibo drift-scan survey. Our survey data for this pulsar show that the emission can be described by a steady pulse component with bursting emission, which lasts for typically 20--25 pulse periods, superposed. Other new discoveries are the young 80.1-ms pulsar PSR~J1935+2025 which exhibits a significant amount of unmodeled low-frequency noise in its timing residuals, and the 4.2-ms pulsar PSR~J1935+1726 which is in a low-mass binary system with a 90.7-day circular orbit.
We present the discovery of 37 pulsars from $\sim$ 20 years old archival data of the Parkes Multibeam Pulsar Survey using a new FFT-based search pipeline optimised for discovering narrow-duty cycle pulsars. When developing our pulsar search pipeline, we noticed that the signal-to-noise ratios of folded and optimised pulsars often exceeded that achieved in the spectral domain by a factor of two or greater, in particular for narrow duty cycle ones. Based on simulations, we verified that this is a feature of search codes that sum harmonics incoherently and found that many promising pulsar candida…
The main goal of pulsar timing array experiments is to detect correlated signals such as nanohertz-frequency gravitational waves. Pulsar timing data collected in dense monitoring campaigns can also be used to study the stars themselves, their binary companions, and the intervening ionised interstellar medium. Timing observations are extraordinarily sensitive to changes in path length between the pulsar and the Earth, enabling precise measurements of the pulsar positions, distances and velocities, and the shapes of their orbits. Here we present a timing analysis of 25 pulsars observed as part o…
帕克斯多波束脉冲星巡天的再处理发现了五颗以前未知的脉冲星和几颗尚未确认的候选者。PSR J 0922 -52的周期为9.68 ms，DM为122.4 pc cm^-3。PSR J1147-66的周期为3.72 ms，DM为133.8 pc cm^-3。PSR J1227-6208的周期为34.53 ms，DM为362.6 pc cm^-3，处于一个6.7天的双星轨道上，桑顿等人在进行中的高分辨率帕克斯巡天中独立探测到了它，爱因斯坦@Home志愿者也在独立处理中探测到了它。PSR J1546-59的周期为7.80 ms，DM为168.3 pc cm^-3。PSR J1725-3853是一颗孤立的4.79 ms脉冲星，DM为158.2 pc cm^-3。这些候选人可能在早期的处理工作中被遗漏，因为他们的DM很高，周期很短，而且需要浏览的候选人数量很大。这些发现表明，在多波束勘测数据中，还有待发现更多的类星体。
Timing of young radio pulsars I: Timing noise, periodic modulation and proper motion
年轻恒星的平稳降旋受到两种非确定性现象的扰动：毛刺和定时噪声。虽然定时噪声提供了对极端密度下的核物理和等离子体物理的见解，但它是高精度脉冲星定时实验的障碍。本文提出了一种改进的基于贝叶斯推理的方法，用于同时模拟用64 m Parkes射电望远镜观测了$\sim$ 10年的85个高$\dot{E}$射电望远镜样本的随机和确定性参数。定时噪声是一个红色的过程，我们开发了一个参数化的基础上的红色噪声幅度（$A_{\rm red}$）和频谱指数（$β$）。我们测量的中位数$A_{\rm red}$为$-10.4^{+1.8}_{-1.7}$ yr $^{3/2}$和$β$为$-5.2^{+3.0}_{-3.8}$，并表明定时噪声的强度与$ν^{1}|\dotν|^{-0.6\pm0.1}$成正比，其中$ν$是脉冲星的自旋频率，$\dotν$是其自旋下降率。最后，我们测量了19颗恒星的重要制动指数，两颗恒星的自行，并讨论了五颗恒星到达时间的周期性调制。
We revisit the population of normal pulsars in the Galactic field in an `evolutionary' approach. By comparing the distributions of various parameters of synthetic pulsars detectable by the Parkes Multibeam Pulsar Survey, the Pulsar Arecibo L-band Feed Array Survey, and two Swinburne Multibeam surveys with those of the real pulsars detected by the same surveys, we find that a good and physically realistic model can be obtained by using a uniform distribution of the braking index in the range of 2.5 to 3.0, a uniform distribution of the cosine of the angle between the spin and the magnetic axis …
Timing the main-sequence-star binary pulsar J1740-3052
PSR J1740-3052是一颗年轻的脉冲星，其伴星很可能是B型主序星。自从十多年前发现它以来，已经用Green Bank，Parkes，Lovell和Westerbork望远镜的仪器在几个频率上获得了数据。我们测量了脉冲轮廓中的散射时间尺度，并测量了作为二元轨道相位函数的色散变化，并提供了证据表明，由于伴星的风，这两者的变化与预期的一样。使用脉冲到达时间已被纠正所观察到的周期性色散措施的变化，我们发现一个时间的解决方案，跨越1997年11月至2011年3月。这包括测量近星点的推进和轨道投影半长轴的变化，并对轨道几何形状设定限制。根据这些限制，我们估计脉冲星在出生时至少接受了~50 km/s的反冲。准周期信号存在于定时残差中，其周期为双星轨道周期的2.2倍。这个信号的来源尚不清楚。
