LOFAR发现PSR B0823+26的宁静发射模式
太阳与恒星天体物理
2015-05-13 v1 高能天体物理现象
摘要
PSR B0823+26是一颗周期为0.53秒的射电脉冲星，在秒至（至少）小时的时间尺度上展现出大量发射现象，包括零脉冲（nulling）、子脉冲漂移（subpulse drifting）和模式变换（mode-changing）。研究诸如PSR B0823+26这样的脉冲星，可进一步深入了解这些不同发射现象之间的关系，以及它们可能告诉我们关于脉冲星磁层的什么信息。在此我们报道LOFAR的发现：PSR B0823+26具有一种微弱且零星发射的“宁静”（Q）发射模式，其平均强度弱于更规则发射的“亮”（B）模式100倍以上，且零脉冲比例为其四十倍。此前，该脉冲星在Q模式下未被探测到，并被假定为连续零脉冲。PSR B0823+26在转入B模式之前平均流量进一步降低，或许在此时真正完全关闭。此外，利用LOFAR、Westerbork、Lovell和Effelsberg望远镜在110 MHz至2.7 GHz之间进行的同步观测表明，Q模式与B模式之间的转换发生在中子星单次旋转之内，并且在观测的频率范围内同时发生。
引用
@article{arxiv.1505.03064,
title = {LOFAR discovery of a quiet emission mode in PSR B0823+26},
author = {C. Sobey and N. J. Young and J. W. T. Hessels and P. Weltevrede and A. Noutsos and B. W. Stappers and M. Kramer and C. Bassa and A. G. Lyne and V. I. Kondratiev and T. E. Hassall and E. F. Keane and A. V. Bilous and R. P. Breton and J. -M. Grießmeier and A. Karastergiou and M. Pilia and M. Serylak and S. ter Veen and J. van Leeuwen and A. Alexov and J. Anderson and A. Asgekar and I. M. Avruch and M. E. Bell and M. J. Bentum and G. Bernardi and P. Best and L. Bîrzan and A. Bonafede and F. Breitling and J. Broderick and M. Brüggen and A. Corstanje and D. Carbone and E. de Geus and M. de Vos and A. van Duin and S. Duscha and J. Eislöffel and H. Falcke and R. A. Fallows and R. Fender and C. Ferrari and W. Frieswijk and M. A. Garrett and A. W. Gunst and J. P. Hamaker and G. Heald and M. Hoeft and J. Hörandel and E. Jütte and G. Kuper and P. Maat and G. Mann and S. Markoff and R. McFadden and D. McKay-Bukowski and J. P. McKean and D. D. Mulcahy and H. Munk and A. Nelles and M. J. Norden and E. Orrù and H. Paas and M. Pandey-Pommier and V. N. Pandey and G. Pietka and R. Pizzo and A. G. Polatidis and D. Rafferty and A. Renting and H. Röttgering and A. Rowlinson and A. M. M. Scaife and D. Schwarz and J. Sluman and O. Smirnov and M. Steinmetz and A. Stewart and J. Swinbank and M. Tagger and Y. Tang and C. Tasse and S. Thoudam and C. Toribio and R. Vermeulen and C. Vocks and R. J. van Weeren and R. A. M. J. Wijers and M. W. Wise and O. Wucknitz and S. Yatawatta and P. Zarka},
journal= {arXiv preprint arXiv:1505.03064},
year = {2015}
}
备注
15 pages, 8 figures, 2 tables, accepted for publication in MNRAS