利用 Murchison Widefield Array 观测到的 PSR J0437-4715 的低频特性
太阳与恒星天体物理
2015-06-22 v1 高能天体物理现象
摘要
我们报告了利用 Murchison Widefield Array (MWA) 在 192 MHz 频率下对毫秒脉冲星 PSR J0437-4715 的探测。我们的观测显示了由星际介质 (ISM) 中的衍射闪烁效应引起的时间和频率上的脉冲强度快速调制,以及由折射效应引起的时间 - 频率平面上强度极大值的显著漂移。我们的分析表明,散射屏位于距离太阳约 80-120 pc 处,这与近期声称散射屏更近(10 pc)的观点相悖。与 Parkes 的高频数据对比揭示了脉冲轮廓随频率的剧烈演化,外锥发射变得与核区和内锥区域的发射强度相当。除了展示 MWA 目前具备的高时间分辨率科学能力外,我们的观测还强调了开展计时阵列毫秒脉冲星低频研究的潜力,这可能通过对 ISM 效应的精确表征来提高探测纳赫兹引力波的灵敏度。
引用
@article{arxiv.1407.4745,
title = {The low-frequency characteristics of PSR J0437-4715 observed with the Murchison Widefield Array},
author = {N. D. Ramesh Bhat and S. M. Ord and S. E. Tremblay and S. J. Tingay and Avinash Deshpande and W. van Straten and S. Oronsaye and G. Bernardi and Judd Bowman and F. Briggs and R. J. Cappallo and Brian Corey and D. Emerich and R Goeke and Lincoln Greenhill and Bryna Hazelton and Jacqueline N. Hewitt and Melanie Johnston-Hollitt and David Kaplan and Justin Kasper and E. Kratzenberg and C. J. Lonsdale and M. J. Lynch and S. McWhirter and D. A. Mitchell and Miguel Morales and Edward H. Morgan and Divya Oberoi and Thayagaraja Prabu and Alan E. E. Rogers and D. A. Roshi and N. Udayashankar and K. S. Srivani and R. Subramanyan and M. Waterson and Randall Wayth and Rachel Webster and Alan Whitney and A. Williams and C. L. Wiliams},
journal= {arXiv preprint arXiv:1407.4745},
year = {2015}
}
备注
6 pages, 4 figures, 1 table, Accepted for publication in ApJ Letters