Three Pulsars Discovered by FAST in the Globular Cluster NGC 6517 with a Pulsar Candidate Sifting Code Based on Dispersion Measure to Signal-to-Noise Ratio Plots
| Autor: | Scott M. Ransom, Lin Wang, Peng Jiang, Duncan R. Lorimer, Lei Qian, X. H. Ma, Zhen Yan, Jin-Tao Luo, Zhichen Pan |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) 010308 nuclear & particles physics media_common.quotation_subject FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Radio telescope Pulsar Space and Planetary Science Position (vector) Sky Globular cluster 0103 physical sciences Dispersion (optics) Cluster (physics) Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Spin-½ media_common |
| DOI: | 10.48550/arxiv.2103.14927 |
| Popis: | We report the discovery of three new pulsars in the Globular Cluster (GC) NGC6517, namely NGC 6517 E, F, and G, made with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The spin periods of NGC 6517 E, F, and G are 7.60~ms, 24.89~ms, and 51.59~ms, respectively. Their dispersion measures are 183.29, 183.713, and 185.3~pc~cm$^{-3}$, respectively, all slightly larger than those of the previously known pulsars in this cluster. The spin period derivatives are at the level of 1$\times$10$^{-18}$~s~s$^{-1}$, which suggests these are recycled pulsars. In addition to the discovery of these three new pulsars, we updated the timing solutions of the known isolated pulsars, NGC 6517 A, C, and D. The solutions are consistent with those from Lynch et al. (2011) and with smaller timing residuals. From the timing solution, NGC 6517 A, B (position from Lynch et al. 2011), C, E, and F are very close to each other on the sky and only a few arcseconds from the optical core of NGC 6517. With currently published and unpublished discoveries, NGC6517 now has 9 pulsars, ranking 5$^{th}$ of the GCs with the most pulsars. The discoveries take advantage of the high sensitivity of FAST and a new algorithm used to check and filter possible candidate signals. Comment: 10 pages, 3 figure, 2 tables, accepted by RAA, comments are always welcomed! |
| Databáze: | OpenAIRE |
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