The LOFAR pilot surveys for pulsars and fast radio transients-猫眼课题宝

DOI：

10.1051/0004-6361/201424495

发表时间：

2014-08

期刊：

Astronomy and Astrophysics

影响因子：

6.5

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

T. Coenen;J. V. Leeuwen;J. Hessels;B. Stappers;V. Kondratiev;A. Alexov;R. Breton;A. Bilous;S. Cooper;H. Falcke;H. Falcke;R. Fallows;V. Gajjar;J. Grießmeier;T. Hassall;A. Karastergiou;E. Keane;M. Kramer;M. Kuniyoshi;A. Noutsos;S. Osłowski;S. Osłowski;M. Pilia;M. Serylak;C. Schrijvers;C. Sobey;S. Veen;J. Verbiest;P. Weltevrede;S. Wijnholds;K. Zagkouris;A. V. Amesfoort;James M. Anderson;A. Asgekar;I. Avruch;M. Bell;M. Bentum;G. Bernardi;P. Best;A. Bonafede;F. Breitling;J. Broderick;M. Brüggen;H. Butcher;B. Ciardi;A. Corstanje;A. Deller;S. Duscha;J. Eislöffel;R. Fender;C. Ferrari;W. Frieswijk;M. Garrett;F. Gasperin;E. D. Geus;A. Gunst;J. Hamaker;G. Heald;M. Hoeft;A. Horst;E. Juette;G. Kuper;C. Law;C. Law;G. Mann;R. McFadden;D. McKay-Bukowski;D. McKay-Bukowski;J. McKean;H. Munk;E. Orrú;H. Paas;M. Pandey-Pommier;A. Polatidis;W. Reich;A. Renting;H. Röttgering;A. Rowlinson;A. Scaife;D. Schwarz;J. Sluman;O. Smirnov;J. Swinbank;M. Tagger;Y. Tang;C. Tasse;S. Thoudam;C. Toribio;R. Vermeulen;C. Vocks;R. V. Weeren;O. Wucknitz;P. Zarka;A. Zensus

我们使用 140 MHz 左右的低频阵列 (LOFAR) 对射电脉冲星和快速瞬变进行了两次试点调查，在此报告了第一个低频快速射电爆发极限和两颗新脉冲星的发现。第一项观测是 LOFAR 飞行员脉冲星观测 (LPPS)，观测了北方天空的大部分区域，约 1.4 x 10^4 平方度，停留时间为 1 小时。每次观测覆盖约 75 平方度，使用 7 个独立的场，这些独立的场是通过对高频带天线场进行非相干求和而形成的。第二次试点调查是 LOFAR 系列阵调查 (LOTAS)，覆盖范围约为 600 平方英尺，与 LPPS 相比，灵敏度大约提高了 5 倍。使用 6 个 LOFAR“Superterp”站的相干总和，我们形成了 19 个捆绑阵列波束，每个指向共同覆盖 4 平方度。从 LPPS 中，我们得出了在 142 MHz 下，对于 0.66 ms 的最窄搜索突发持续时间，分散无线电突发的出现限制为 107 Jy。在 LPPS 中，我们重新探测到了 65 颗先前已知的脉冲星。 LOTAS 发现了两颗脉冲星，第一颗带有 LOFAR 或任何数字孔径阵列。 LOTAS 还重新探测到了 27 颗先前已知的脉冲星。这些试点研究表明，LOFAR 可以有效地对脉冲星和快速瞬变进行全天勘测，并为使用 LOFAR 和计划的平方公里阵列低频组件的进一步勘测工作奠定了基础。

We have conducted two pilot surveys for radio pulsars and fast transients with the Low-Frequency Array (LOFAR) around 140 MHz and here report on the first low-frequency fast-radio burst limit and the discovery of two new pulsars. The first survey, the LOFAR Pilot Pulsar Survey (LPPS), observed a large fraction of the northern sky, ~1.4 x 10^4 sq. deg, with 1-hr dwell times. Each observation covered ~75 sq. deg using 7 independent fields formed by incoherently summing the high-band antenna fields. The second pilot survey, the LOFAR Tied-Array Survey (LOTAS), spanned ~600 sq. deg, with roughly a 5-fold increase in sensitivity compared with LPPS. Using a coherent sum of the 6 LOFAR "Superterp" stations, we formed 19 tied-array beams, together covering 4 sq. deg per pointing. From LPPS we derive a limit on the occurrence, at 142 MHz, of dispersed radio bursts of 107 Jy for the narrowest searched burst duration of 0.66 ms. In LPPS, we re-detected 65 previously known pulsars. LOTAS discovered two pulsars, the first with LOFAR or any digital aperture array. LOTAS also re-detected 27 previously known pulsars. These pilot studies show that LOFAR can efficiently carry out all-sky surveys for pulsars and fast transients, and they set the stage for further surveying efforts using LOFAR and the planned low-frequency component of the Square Kilometer Array.

The LOFAR pilot surveys for pulsars and fast radio transients

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