脉冲星的宽带同步观测：分离色散量与轮廓变化
高能天体物理现象
2012-06-28 v2
摘要
星际介质中的色散是一种众所周知的现象，遵循简单的关系式，自 20 世纪 60 年代末以来一直被用于预测色散射电脉冲的时间延迟。我们利用 LOFAR（40-190 MHz）、76 米 Lovell 望远镜（1400 MHz）和 Effelsberg 100 米望远镜（8000 MHz）对四颗脉冲星进行了宽带同步观测，以检验色散定律在宽频带范围内的准确性。本文展示了这些观测结果，表明在我们观测频段内，色散定律的准确度优于十万分之一。我们利用这一事实约束了视线方向上星际介质（ISM）的某些性质，并利用未观测到任何光行差或延迟效应，确定了脉冲星磁层中发射高度的上限。我们还讨论了脉冲轮廓演化对我们观测的影响，及其对脉冲星计时阵列探测引力波等高精度脉冲星计时项目可能产生的启示。
引用
@article{arxiv.1204.3864,
title = {Wide-band Simultaneous Observations of Pulsars: Disentangling Dispersion Measure and Profile Variations},
author = {T. E. Hassall and B. W. Stappers and J. W. T. Hessels and M. Kramer and A. Alexov and K. Anderson and T. Coenen and A. Karastergiou and E. F. Keane and V. I. Kondratiev and K. Lazaridis and J. van Leeuwen and A. Noutsos and M. Serylak and C. Sobey and J. P. W. Verbiest and P. Weltevrede and K. Zagkouris and R. Fender and R. A. M. J. Wijers and L. Bahren and M. E. Bell and J. W. Broderick and S. Corbel and E. J. Daw and V. S. Dhillon and J. Eisloffel and H. Falcke and J. -M. Griessmeier and P. Jonker and C. Law and S. Markoff and J. C. A. Miller-Jones and R. Osten and E. Rol and A. M. M. Scaife and B. Scheers and P. Schellart and H. Spreeuw and J. Swinbank and S. ter Veen and M. W. Wise and R. Wijnands and O. Wucknitz and P. Zarka and A. Asgekar and M. R. Bell and M. J. Bentum and G. Bernardi and P. Best and A. Bonafede and A. J. Boonstra and M. Brentjens and W. N. Brouw and M. Bruggen and H. R. Butcher and B. Ciardi and M. A. Garrett and M. Gerbers and A. W. Gunst and M. P. van Haarlem and G. Heald and M. Hoeft and H. Holties and A. de Jong and L. V. E. Koopmans and M. Kuniyoshi and G. Kuper and G. M. Loose and P. Maat and J. Masters and J. P. McKean and H. Meulman and M. Mevius and H. Munk and J. E. Noordam and E. Orru and H. Paas and M. Pandey-Pommier and V. N. Pandey and R. Pizzo and A. Polatidis and W. Reich and H. Rottgering and J. Sluman and M. Steinmetz and C. G. M. Sterks and M. Tagger and Y. Tang and C. Tasse and R. Vermeulen and R. J. van Weeren and S. J. Wijnholds and S. Yatawatta},
journal= {arXiv preprint arXiv:1204.3864},
year = {2012}
}
备注
20 Pages, 14 Figures, Accepted for publication in Astronomy & Astrophysics