ON THE RELAXATION BEHAVIORS OF SLOW AND CLASSICAL GLITCHES: OBSERVATIONAL BIASES AND THEIR OPPOSITE RECOVERY TRENDS

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	ON THE RELAXATION BEHAVIORS OF SLOW AND CLASSICAL GLITCHES: OBSERVATIONAL BIASES AND THEIR OPPOSITE RECOVERY TRENDS
	Xie, Y; Zhang SN(张双南); Zhang, SN
刊名	ASTROPHYSICAL JOURNAL
	2013
卷号	778 期号:1 页码:31
关键词	magnetic fields pulsars: general pulsars: individual (B1822-09 stars: neutron B2334+61)
英文摘要	We study the pulsar timing properties and the data analysis methods of glitch recoveries. In some cases one first fits the times of arrival (TOAs) to obtain the "time-averaged" frequency. and its first derivative.., and then fits models to them. However, our simulations show that. and. obtained in this way are systematically biased unless the time intervals between the nearby data points of TOAs are smaller than about 10(4) s, which is much shorter than typical observation intervals. Alternatively, glitch parameters can be obtained by fitting the phases directly with relatively smaller biases, but the initial recovery time scale is usually chosen by eye, which may introduce a strong bias. We also construct a phenomenological model by assuming a pulsar spin-down law of (nu) over dot nu(-3) = -H(0)G(t) with G(t) = 1 + kappa e(-t/iota) for a glitch recovery, where H-0 is a constant and. and t are the glitch parameters to be found. This model can reproduce the observed data of slow glitches from B1822-09 and the giant classical glitch of B2334+61, with kappa < 0 or kappa > 0, respectively. We then use this model to simulate TOA data and test several fitting procedures for a glitch recovery. The best procedure is (1) to use a very high order polynomial (e. g., to 50th order) to precisely describe the phase, (2) obtain.(t) and..(t) from the polynomial, then (3) obtain the glitch parameters from nu(t) or (nu) over dot (t). Finally, the uncertainty in the starting time t(0) of a classical glitch causes uncertainties in some glitch parameters, but less so for a slow glitch, t(0), of which can be determined from data.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000327131700031
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224390]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Xie, Y,Zhang SN,Zhang, SN. ON THE RELAXATION BEHAVIORS OF SLOW AND CLASSICAL GLITCHES: OBSERVATIONAL BIASES AND THEIR OPPOSITE RECOVERY TRENDS[J]. ASTROPHYSICAL JOURNAL,2013,778(1):31.
APA	Xie, Y,张双南,&Zhang, SN.(2013).ON THE RELAXATION BEHAVIORS OF SLOW AND CLASSICAL GLITCHES: OBSERVATIONAL BIASES AND THEIR OPPOSITE RECOVERY TRENDS.ASTROPHYSICAL JOURNAL,778(1),31.
MLA	Xie, Y,et al."ON THE RELAXATION BEHAVIORS OF SLOW AND CLASSICAL GLITCHES: OBSERVATIONAL BIASES AND THEIR OPPOSITE RECOVERY TRENDS".ASTROPHYSICAL JOURNAL 778.1(2013):31.