偶然发现维斯特伦德 1 背景中的 431 毫秒脉冲星

IF 2.5 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Universe Pub Date : 2024-06-25 DOI:10.3390/universe10070274
Viviana Piga, Marta Burgay, Andrea Possenti, Alessandro Ridolfi, Maura Pilia, Nanda Rea, Rosalba Perna, Monica Colpi, Gianluca Israel
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引用次数: 0

摘要

我们报告在年轻的大质量星团 Westerlund 1 的方向上发现了一颗 431 毫秒的孤立脉冲星 PSR J1646-4545。这颗脉冲星是在澳大利亚 "Murriyang "Parkes 射电望远镜 2005 年至 2010 年的数据中发现的。由于多次探测到这颗脉冲星,我们得以推导出跨越整个数据集的相位连接定时解。这使我们能够在星团边界精确定位脉冲星,并测量其自旋下降率。PSR J1646-4545的年龄,加上其1029 pc cm-3的色散测量值,是Westerlund 1的两个主要星系电子密度模型预测值的两倍多,这使得脉冲星与星团的联系变得非常不可能。我们还报告了 Westerlund 1 中磁星的存在和普通射电脉冲星的明显缺乏所带来的影响。
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Serendipitous Discovery of a 431 ms Pulsar in the Background of Westerlund 1
We report the discovery of PSR J1646−4545, a 431 ms isolated pulsar, in the direction of the young massive cluster Westerlund 1. The pulsar was found in data taken between the years 2005 and 2010 with the “Murriyang” Parkes radio telescope in Australia. Thanks to the numerous detections of the pulsar, we were able to derive a phase-connected timing solution spanning the whole data set. This allowed us to precisely locate the pulsar at the border of the cluster and to measure its spin-down rate. The latter implies a characteristic age of ∼25 Myr, about twice as large as the estimated age of Westerlund 1. The age of PSR J1646−4545, together with its dispersion measure of ∼1029 pc cm−3, more than twice the value predicted by the two main galactic electron density models for Westerlund 1, makes the association of the pulsar with the cluster highly unlikely. We also report on ramifications from the presence of a magnetar in Westerlund 1 and the apparent lack of ordinary radio pulsars.
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来源期刊
Universe
Universe Physics and Astronomy-General Physics and Astronomy
CiteScore
4.30
自引率
17.20%
发文量
562
审稿时长
24.38 days
期刊介绍: Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.
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