{"title":"Comparative analysis of the parameters of pulsars with braking indices \\(n>0\\) and \\(n<0\\)","authors":"C. C. Onuchukwu, E. Legahara","doi":"10.1007/s10509-024-04317-3","DOIUrl":null,"url":null,"abstract":"<div><p>We analyzed the timing parameters (the rotational frequency <span>\\(\\nu \\)</span>, the first <span>\\(\\left ( \\dot{\\nu } \\right )\\)</span> and second <span>\\(\\left ( \\ddot{\\nu } \\right )\\)</span> time-derivatives of frequency) and the derived parameters of a sample of pulsars for which <span>\\(\\ddot{\\nu } \\)</span> (470 pulsars) were recorded in the Australian Telescope National Facility (ATNF) pulsar catalog. We formed various subsamples, those with braking indices <span>\\(n<0\\)</span> and <span>\\(n>0\\)</span>, 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 <span>\\(n>0\\)</span> appear to rotate faster than those with <span>\\(n<0\\)</span>. Our results also suggest that glitching pulsars have lower values of <span>\\(\\left \\vert n \\right \\vert \\)</span> (where <span>\\(\\left \\vert n \\right \\vert \\)</span> is the absolute value of the braking index), and it is lower for the subsample with <span>\\(n>0\\)</span> than for the subsample with <span>\\(n<0\\)</span>. We believe that the results obtained could be useful in understanding the evolution of pulsar spin.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"369 5","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astrophysics and Space Science","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s10509-024-04317-3","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
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.
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.