LOFAR脉冲星和快速射电瞬变源先导巡天
太阳与恒星天体物理
2014-10-22 v1 高能天体物理现象
摘要
我们使用低频阵列（LOFAR）在140 MHz附近进行了两次射电脉冲星和快速瞬变源的先导巡天，并在此报告第一个低频快速射电暴上限以及两颗新脉冲星的发现。第一次巡天，LOFAR脉冲星先导巡天（LPPS），观测了北天大部分区域，约1.4 x 10^4平方度，每次驻留1小时。每次观测覆盖约75平方度，使用7个由高波段天线场非相干求和形成的独立场。第二次先导巡天，LOFAR绑定阵列巡天（LOTAS），覆盖约600平方度，灵敏度比LPPS提高约5倍。使用6个LOFAR "Superterp"站的相干求和，我们形成了19个绑定阵列波束，每次指向覆盖4平方度。从LPPS我们得到142 MHz处色散射电暴的发生率上限为< 150 /天/天空，对于最窄搜索脉冲宽度0.66 ms，亮度S > 107 Jy的暴。在LPPS中，我们重新探测到65颗已知脉冲星。LOTAS发现了两颗脉冲星，这是LOFAR或任何数字孔径阵列首次发现脉冲星。LOTAS还重新探测到27颗已知脉冲星。这些先导研究表明，LOFAR可以高效地进行全天空脉冲星和快速瞬变源巡天，并为后续使用LOFAR和计划中的平方公里阵列低频组件的巡天工作奠定了基础。
引用
@article{arxiv.1408.0411,
title = {The LOFAR Pilot Surveys for Pulsars and Fast Radio Transients},
author = {Thijs Coenen and Joeri van Leeuwen and Jason W. T. Hessels and Ben W. Stappers and Vladislav I. Kondratiev and A. Alexov and R. P. Breton and A. Bilous and S. Cooper and H. Falcke and R. A. Fallows and V. Gajjar and J. -M. Grießmeier and T. E. Hassall and A. Karastergiou and E. F. Keane and M. Kramer and M. Kuniyoshi and A. Noutsos and S. Osłowski and M. Pilia and M. Serylak and C. Schrijvers and C. Sobey and S. ter Veen and J. Verbiest and P. Weltevrede and S. Wijnholds and K. Zagkouris and A. S. van Amesfoort 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 A. Bonafede and F. Breitling and J. Broderick and M. Brüggen and H. R. Butcher and B. Ciardi and A. Corstanje and A. Deller and S. Duscha and J. Eislöffel and R. Fender and C. Ferrari and W. Frieswijk and M. A. Garrett and F. de Gasperin and E. de Geus and A. W. Gunst and J. P. Hamaker and G. Heald and M. Hoeft and A. van der Horst and E. Juette and G. Kuper and C. Law and G. Mann and R. McFadden and D. McKay-Bukowski and J. P. McKean and H. Munk and E. Orru and H. Paas and M. Pandey-Pommier and A. G. Polatidis and W. Reich and A. Renting and H. Röttgering and A. Rowlinson and A. M. M. Scaife and D. Schwarz and J. Sluman and O. Smirnov 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 O. Wucknitz and P. Zarka and A. Zensus},
journal= {arXiv preprint arXiv:1408.0411},
year = {2014}
}
备注
18 pages, 10 figures, accepted for A&A