Giant Metrewave Radio Telescope Discovery of a Millisecond Pulsar in a Very Eccentric Binary System
Giant Metrewave Radio Telescope Discovery of a Millisecond Pulsar in a Very Eccentric Binary System
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DOI：
10.1086/421085
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发表时间：
2004-03
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影响因子：
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通讯作者：
P. Freire;Y. Gupta;S. Ransom;S. Ransom;C. Ishwara-Chandra
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作者：
P. Freire;Y. Gupta;S. Ransom;S. Ransom;C. Ishwara-Chandra
我们报告发现了二元毫秒脉冲星 PSR J0514-4002A，它是球状星团 NGC 1851 中第一颗已知的脉冲星，也是使用巨型米波射电望远镜发现的第一颗脉冲星。该脉冲星的自转周期为4.99毫秒，轨道周期为18.8天，是迄今为止测量到的最偏心的脉冲星轨道（e = 0.89）。该伴星的最小质量为 0.9 M☉，目前其性质尚不清楚。在吸积低质量伴星的物质并将其旋转至（几）毫秒的旋转周期后，脉冲星最终将低质量恒星换成了其质量更大的伴星。这与形成包含毫秒脉冲星和黑洞的系统完全相同。 NGC 1851A 的发现表明，只要球状星团中存在恒星质量黑洞，这样的系统就可能存在于宇宙中。
We report the discovery of the binary millisecond pulsar PSR J0514-4002A, which is the first known pulsar in the globular cluster NGC 1851 and the first pulsar discovered using the Giant Metrewave Radio Telescope. The pulsar has a rotational period of 4.99 ms, an orbital period of 18.8 days, and the most eccentric pulsar orbit yet measured (e = 0.89). The companion has a minimum mass of 0.9 M☉, and its nature is currently unclear. After accreting matter from a low-mass companion star that spun it up to a (few) millisecond spin period, the pulsar eventually exchanged the low-mass star for its more massive present companion. This is exactly the same process that could form a system containing a millisecond pulsar and a black hole; the discovery of NGC 1851A demonstrates that such systems might exist in the universe, provided that stellar mass black holes exist in globular clusters.