软伽马暴记者 SGR 1900+14 的可变减速及其与爆发活动的相关性
摘要
We have analyzed Rossi X-ray Timing Explorer Proportional Counter Array observations of the pulsed emission from SGR 1900+14 during September 1996, June - October 1998, and early 1999. Using these measurements and results reported elsewhere, we construct a period history of this source for 2.5 years. We find significant deviations from a steady spin-down trend during quiescence and the burst active interval. Burst and Transient Source Experiment observations of the burst emission are presented and correlations between the burst activity and spin-down rate of SGR 1900+14 are discussed. We find an 80 day interval during the summer of 1998 when the average spin-down rate is larger than the rate elsewhere by a factor ~ 2.3. This enhanced spin-down may be the result of a discontinuous spin-down event or "braking glitch" at the time of the giant flare on 27 August 1998. Furthermore, we find a large discrepancy between the pulsar period and average spin-down rate in X-rays as compared to radio observations for December 1998 and January 1999.
关键词
引用
@article{arxiv.astro-ph/9907173,
title = {Variable Spin-down in the Soft Gamma Repeater SGR 1900+14 and Correlations with Burst Activity},
author = {Peter M. Woods and Chryssa Kouveliotou and Jan van Paradijs and Mark H. Finger and Christopher Thompson and Robert C. Duncan and Kevin Hurley and Tod Strohmayer and Jean Swank and Toshio Murakami},
journal= {arXiv preprint arXiv:astro-ph/9907173},
year = {2009}
}
备注
6 pages, 2 figures, submitted to ApJ Letters