Comparative analysis of the parameters of pulsars with braking indices \(n>0\) and \(n<0\)

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
C. C. Onuchukwu, E. Legahara
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Abstract

We analyzed the timing parameters (the rotational frequency \(\nu \), the first \(\left ( \dot{\nu } \right )\) and second \(\left ( \ddot{\nu } \right )\) time-derivatives of frequency) and the derived parameters of a sample of pulsars for which \(\ddot{\nu } \) (470 pulsars) were recorded in the Australian Telescope National Facility (ATNF) pulsar catalog. We formed various subsamples, those with braking indices \(n<0\) and \(n>0\), and glitching and non-glitching pulsars. Our statistical analyses of the timing and derived parameters indicated some level of differences and similarities among the parameters analyzed. Glitching pulsars appear to have a higher rotational frequency than non-glitching pulsars, and pulsars with \(n>0\) appear to rotate faster than those with \(n<0\). Our results also suggest that glitching pulsars have lower values of \(\left \vert n \right \vert \) (where \(\left \vert n \right \vert \) is the absolute value of the braking index), and it is lower for the subsample with \(n>0\) than for the subsample with \(n<0\). We believe that the results obtained could be useful in understanding the evolution of pulsar spin.

Abstract Image

制动指数为 $n>0$ 和 $n<0$ 的脉冲星参数对比分析
我们分析了时间参数(旋转频率)、我们分析了澳大利亚国家望远镜设施(ATNF)脉冲星目录中记录的脉冲星(470颗)的第一个(左)和第二个(左)频率的时间衍生物以及衍生参数。我们形成了不同的子样本,包括制动指数为\(n<0\)和\(n>0\)的脉冲星,以及闪烁和非闪烁脉冲星。我们对定时和衍生参数的统计分析表明,所分析的参数之间存在一定程度的差异和相似性。与非闪烁脉冲星相比,闪烁脉冲星的旋转频率似乎更高,而具有(n>0\)的脉冲星似乎比具有(n<0\)的脉冲星旋转得更快。我们的结果还表明,闪烁脉冲星的\(\left \vert n \right \vert \)(其中\(\left \vert n \right \vert \)是制动指数的绝对值)值较低,而且具有\(n>0\)的子样本的制动指数低于具有\(n<0\)的子样本。我们相信所获得的结果有助于理解脉冲星自旋的演变。
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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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