Simultaneous Constraints on the Mass and Radius of Aql X-1 from Quiescence and X-Ray Burst Observations

doi:10.3847/1538-4357/aa7d0b

	Simultaneous Constraints on the Mass and Radius of Aql X-1 from Quiescence and X-Ray Burst Observations
	Qu JL(屈进禄); Xu, RX; Li, ZS; Falanga, M; Chen, L; Qu, JL
刊名	ASTROPHYSICAL JOURNAL
	2017
卷号	845 期号:1 页码:8
关键词	equation of state stars: neutron X-rays: binaries X-rays: bursts X-rays: individual (Aql X-1)
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa7d0b
文献子类	Article
英文摘要	The measurement of neutron star mass and radius is one of the most direct ways to distinguish between various dense matter equations of state. The mass and radius of accreting neutron stars hosted in low-mass X-ray binaries can be constrained by several methods, including photospheric radius expansion from type I X-ray bursts and from quiescent spectra. In this paper, we apply for the first time these two methods simultaneously to constrain the mass and radius of Aql X-1. The quiescent spectra from Chandra and XMM-Newton, and photospheric radius expansion bursts from RXTE are used. The determination of the mass and radius of Aql X-1 is also used to verify the consistency between the two methods and to narrow down the uncertainties of the neutron star mass and radius. It is found that the distance to Aql X-1 should be in the range of 4.0-5.75 kpc, based on the overlapping confidence regions between photospheric radius expansion burst and quiescent spectra methods. In addition, we show that the mass and radius determined for the compact star in Aql X-1 are compatible with strange star equations of state and conventional neutron star models.
电子版国际标准刊号	1538-4357
WOS关键词	NEUTRON-STAR MASSES ; EQUATION-OF-STATE ; PULSE-SHAPE ; AQUILA X-1 ; SPECTROSCOPIC MEASUREMENTS ; SYSTEMATIC UNCERTAINTIES ; COMPTONIZED SPECTRA ; MODEL ATMOSPHERES ; NUCLEAR-EQUATION ; TIMING-EXPLORER
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000406918800008
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284713]
专题	高能物理研究所_理论物理室高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Qu JL,Xu, RX,Li, ZS,et al. Simultaneous Constraints on the Mass and Radius of Aql X-1 from Quiescence and X-Ray Burst Observations[J]. ASTROPHYSICAL JOURNAL,2017,845(1):8.
APA	屈进禄,Xu, RX,Li, ZS,Falanga, M,Chen, L,&Qu, JL.(2017).Simultaneous Constraints on the Mass and Radius of Aql X-1 from Quiescence and X-Ray Burst Observations.ASTROPHYSICAL JOURNAL,845(1),8.
MLA	屈进禄,et al."Simultaneous Constraints on the Mass and Radius of Aql X-1 from Quiescence and X-Ray Burst Observations".ASTROPHYSICAL JOURNAL 845.1(2017):8.