利用绿岸望远镜对特赞5中的21毫秒脉冲星进行观测。

Twenty-one millisecond pulsars in Terzan 5 using the Green Bank Telescope.

作者信息

Ransom Scott M, Hessels Jason W T, Stairs Ingrid H, Freire Paulo C C, Camilo Fernando, Kaspi Victoria M, Kaplan David L

机构信息

National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA.

出版信息

Science. 2005 Feb 11;307(5711):892-6. doi: 10.1126/science.1108632. Epub 2005 Jan 13.

DOI:10.1126/science.1108632

PMID:15653465

Abstract

We have identified 21 millisecond pulsars (MSPs) in globular cluster Terzan 5 by using the Green Bank Telescope, bringing the total of known MSPs in Terzan 5 to 24. These discoveries confirm fundamental predictions of globular cluster and binary system evolution. Thirteen of the new MSPs are in binaries, of which two show eclipses and two have highly eccentric orbits. The relativistic periastron advance for the two eccentric systems indicates that at least one of these pulsars has a mass 1.68 times greater than the mass of the Sun at 95% confidence. Such large neutron star masses constrain the equation of state of matter at or beyond the nuclear equilibrium density.

摘要

我们利用绿岸望远镜在球状星团特赞5中发现了21颗毫秒脉冲星（MSP），使特赞5中已知的MSP总数达到24颗。这些发现证实了球状星团和双星系统演化的基本预测。新发现的MSP中有13颗处于双星系统中，其中两颗出现食现象，两颗具有高度偏心的轨道。两个偏心系统的相对论性近日点进动表明，在95%的置信度下，这些脉冲星中至少有一颗的质量比太阳质量大1.68倍。如此大的中子星质量限制了核平衡密度及更高密度下物质的状态方程。