Three Pulsars Discovered in Globular Cluster M15 (NGC 7078) with FAST
arxiv(2023)
摘要
We present the discovery of three pulsars in Globular Cluster M15 (NGC 7078)
by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). In the
three pulsars, PSR~J2129+1210J (M15J) is a millisecond pulsar with a spinning
period of 11.84 ms and a dispersion measure of 66.68 pc cm$^{-3}$. Both
PSR~J2129+1210K and L (M15K and L) are long period pulsars with spinning
periods of 1928 ms and 3961 ms , respectively, while M15L is the GC pulsar with
the longest spinning period till now. The discoveries of M15K and L support the
theory that core-collapsed Globular Clusters may contain partially recycled
long period pulsars. With the same dataset, the timing solutions of M15A to H
were updated, and the timing parameter P1 of M15F is different from the
previous results, which is approximately 0.027$\times 10^{-18} ss^{-1}$ from
our work and $0.032 \times 10^{-18} ss^{-1}$ from
Anderson's\citep{anderson-1993}. As predicted by Rodolfi et al. , the
luminosity of M15C kept decreasing and the latest detection in our dataset is
on December 20$^{\rm th}$, 2022. We also detected M15I for one more time. The
different barycentric spin periods indicate that this pulsar should locate in a
binary system, manifesting itself as the exceptional one in such a
core-collapsing GC.
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关键词
Radio pulsarsl,Globular star cluster,Radio Astronomy
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