论文标题
Trapum使用Meerkat在NGC 6624中发现了四个Pulsar发现
Four pulsar discoveries in NGC 6624 by TRAPUM using MeerKAT
论文作者
论文摘要
我们报告了Trapum大型调查项目的4个新的脉冲球(GC)NGC 6624在Meerkat望远镜的大型调查项目中发现的4个新脉冲星。所有发现的新脉冲星都是孤立的。 PSR J1823 $ - $ 3021I和PSR J1823 $ - $ 3021K是毫秒脉冲,分别为4.319毫秒和2.768毫秒。 PSR J1823 $ - 3021J $ 3021J的时间为20.899毫秒,PSR J1823 $ - $ 3022是一个长期的PULSAR,周期为2.497 s。 Pulsars J1823 $ - $ 3021I,J1823 $ - $ 3021J和J1823 $ - $ 3021K具有与GC成员兼容的位置和分散度量(DM),因此与NGC 6624的成员相吻合。这允许确定跨越二十年的正时解决方案。目前,不可能声称Pulsar J1823 $ - $ 3022与GC之间的关联,而GC持续了很长时间,并且较大的偏移量($ \ sim 3 $ arcminutes)和DM(分数差异为11%,比较了NGC 6624中PULSAR的平均值)。使用Trapum后端的光束形成能力的发现可以在同一视野中生成多个光束,从而使敏感的搜索可以在群集中心的几个半光半径上进行,并可以同时将发现定位。这些发现反映了核心collapsed GC中脉冲星的属性。
We report 4 new pulsars discovered in the core-collapsed globular cluster (GC) NGC 6624 by the TRAPUM Large Survey Project with the MeerKAT telescope. All of the new pulsars found are isolated. PSR J1823$-$3021I and PSR J1823$-$3021K are millisecond pulsars with period of respectively 4.319 ms and 2.768 ms. PSR J1823$-$3021J is mildly recycled with a period of 20.899 ms, and PSR J1823$-$3022 is a long period pulsar with a period of 2.497 s. The pulsars J1823$-$3021I, J1823$-$3021J, and J1823$-$3021K have position and dispersion measure (DM) compatible with being members of the GC and are therefore associated with NGC 6624. Pulsar J1823$-$3022 is the only pulsar bright enough to be re-detected in archival observations of the cluster. This allowed the determination of a timing solution that spans over two decades. It is not possible at the moment to claim the association of pulsar J1823$-$3022 with the GC given the long period and large offset in position ($\sim 3$ arcminutes) and DM (with a fractional difference of 11 percent compared the average of the pulsars in NGC 6624). The discoveries made use of the beamforming capability of the TRAPUM backend to generate multiple beams in the same field of view which allows sensitive searches to be performed over a few half-light radii from the cluster center and can simultaneously localise the discoveries. The discoveries reflect the properties expected for pulsars in core-collapsed GCs.