The PULSE@Parkes project: A new observing technique for long-term pulsar monitoring
G. Hobbs, R. Hollow, D. Champion, J. Khoo, D. Yardley, M. Carr, M. Keith, F. Jenet, S. Amy, M. Burgay, S. Burke-Spolaor, J. Chapman, L. Danaia, B. Homewood, A. … 展开作者
G. Hobbs, R. Hollow, D. Champion, J. Khoo, D. Yardley, M. Carr, M. Keith, F. Jenet, S. Amy, M. Burgay, S. Burke-Spolaor, J. Chapman, L. Danaia, B. Homewood, A. Kovacevic, M. Mao, D. McKinnon, M. Mulcahy, S. Oslowski, W. van Straten
The PULSE@Parkes project has been designed to monitor the rotation of radio pulsars over time spans of days to years. The observations are obtained using the Parkes 64-m and 12-m radio telescopes by Australian and international high school students. These students learn the basis of radio astronomy and undertake small projects with their observations. The data are fully calibrated and obtained with the state-of-the-art pulsar hardware available at Parkes. The final data sets are archived and are currently being used to carry out studies of 1) pulsar glitches, 2) timing noise, 3) pulse profile stability over long time scales and 4) the extreme nulling phenomenon. The data are also included in other projects such as gamma-ray observatory support and for the Parkes Pulsar Timing Array project. In this paper we describe the current status of the project and present the first scientific results from the Parkes 12-m radio telescope. We emphasise that this project offers a straightforward means to enthuse high school students and the general public about radio astronomy while obtaining scientifically valuable data sets.
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…
Flux densities are basic observation parameters to describe pulsars. In the most updated pulsar catalog, 24% of the listed radio pulsars have no flux density measurement at any frequency. Here, we report the first flux density measurements, spectral indices, pulse profiles, and correlations of the spectral index with pulsar parameters for 19 pulsars employing the Ultra-Wideband Low (UWL) receiver system installed on the Parkes radio telescope. The results for spectral indices of 17 pulsars are in the range between -0.6 and -3.10. The polarization profiles of thirteen pulsars are shown. There i…
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。
New classes of astronomical objects are often discovered serendipitously. The enormous data volumes produced by recent high-time resolution, radio-telescope surveys imply that efficient algorithms are required for a discovery. Such algorithms are usually tuned to detect specific, known sources. Existing data sets therefore likely contain unknown astronomical sources, which will remain undetected unless algorithms are developed that can detect a more diverse range of signals. We present the Single-dish PARKES data challenge for finding the uneXpected (SPARKESX), a compilation of real and simula…
To assist with the commissioning (Jiang et al. 2019) of the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we performed a pulsar search, with the primary goal of developing and testing the pulsar data acquisition and processing pipelines. We tested and used three pipelines, two (P1 and P2 hereafter) searched for the periodic signature of pulsars whereas the other one was used to search for bright single pulses (P3 hereafter). A pulsar candidate was discovered in the observation on the 22nd August, 2017, and later confirmed by the Parkes radio telescope on the 10th September, 201…
