期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 444, 期 1, 页码 443-456出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1449
关键词
dense matter; stars: neutron; globular clusters: individual: NGC 6397; globular clusters: individual: NGC 5139; X-rays: binaries
资金
- NSERC Discovery Grant
- Alberta Ingenuity New Faculty Award
- Chandra Award [GO2-13057A, GO2-13057B]
- NASA [NAS8-03060, NAS 5-26555]
- NASA through Space Telescope Science Institute [GO-10257]
- ESA Member States
- STFC [ST/J00135X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J00135X/1] Funding Source: researchfish
We use Chandra and XMM-Newton observations of the globular clusters. Cen and NGC 6397 to measure the spectrum of their quiescent neutron stars (NSs), and thus to constrain the allowed ranges of mass and radius for each. We also use Hubble Space Telescope photometry of NGC 6397 to identify a potential optical companion to the quiescent NS, and find evidence that the companion lacks hydrogen. We carefully consider a number of systematic problems, and show that the choices of atmospheric composition, interstellar medium abundances, and cluster distances can have important effects on the inferred NS mass and radius. We find that for typical NS masses, the radii of both NSs are consistent with the 10-13 km range favoured by recent nuclear physics experiments. This removes the evidence suggested by Guillot and collaborators for an unusually small NS radius, which relied upon the small inferred radius of the NGC 6397 NS.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据