Discovery of millisecond pulsars in radio searches of southern Fermi LAT sources-猫眼课题宝

DOI：

10.1111/j.1365-2966.2011.18464.x

发表时间：

2011-02

期刊：

arXiv: High Energy Astrophysical Phenomena

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

M. Keith;S. Johnston;P. Ray;E. Ferrara;P. Parkinson;O. Celik;A. Belfiore;D. Donato;C. C. Cheung-C.;A. Abdo;F. Camilo;P. Freire;L. Guillemot;A. Harding;M. Kramer;P. Michelson;S. Ransom;R. Romani;D. Smith;D. Thompson;P. Weltevrede;K. Wood

利用帕克斯射电望远镜，我们对11个不相关的伽马射线源进行了深度观测。对这些数据的周期性搜索发现了两颗毫秒脉冲星，PSR J1103-5403(1FGL J1103.9-5355)和PSR J2241-5236(1FGL J2241.9-5236)，以及一颗长周期脉冲星PSR J1604-44(1FGL J1604.7-4443)。此外，我们搜索了费米卫星发现的6颗伽马雷脉冲星的射电脉动，但没有探测到任何射电脉动，脉冲星的水平为-0.04mJy(对于占空比为10%的脉冲星)。毫秒脉冲星PSR J1103-5403的计时表明，它的位置距离伽马射线源的质心9‘。自进行这些观测以来，独立证据表明，1FGL J1103.9-5355与平谱射电源PKS 1101-536有关。尽管偶然发现射电毫秒脉冲星的可能性似乎很低，但似乎可以肯定的是，这颗脉冲星与伽马射线源无关。我们认为，PSR J1604-44是一颗弱的长周期脉冲星的偶然发现，不太可能与1FGL J1604.7-4443有关。PSR J2241-5236的自旋周期为2.2毫秒，其轨道质量非常低，轨道周期为3.5小时。PSR J2241-5236相对较高的磁通密度和较低的色散测量使其成为高精度定时实验的极佳候选者。1FGL J2241.9-5236的伽马射线具有指数截止的幂定律很好地模拟的频谱，与射电星历的相位合并导致了多峰的伽马射线脉冲分布。与钱德拉的观测发现，在通过射电计时获得的脉冲星位置的0.1“范围内有一个符合的X射线源

Using the Parkes radio telescope we have carried out deep observations of eleven unassociated gamma-ray sources. Periodicity searches of these data have discovered two millisecond pulsars, PSR J1103-5403 (1FGL J1103.9-5355) and PSR J2241-5236 (1FGL J2241.9-5236), and a long period pulsar, PSR J1604-44 (1FGL J1604.7-4443). In addition we searched for but did not detect any radio pulsations from six gammaray pulsars discovered by the Fermi satellite to a level of - 0.04 mJy (for pulsars with a 10% duty cycle). Timing of the millisecond pulsar PSR J1103-5403 has shown that its position is 9' from the centroid of the gamma-ray source. Since these observations were carried out, independent evidence has shown that 1FGL J1103.9-5355 is associated with the flat spectrum radio source PKS 1101-536. It appears certain that the pulsar is not associated with the gamma-ray source, despite the seemingly low probability of a chance detection of a radio millisecond pulsar. We consider that PSR J1604-44 is a chance discovery of a weak, long period pulsar and is unlikely to be associated with 1FGL J1604.7-4443. PSR J2241-5236 has a spin period of 2.2 ms and orbits a very low mass companion with a 3.5 hour orbital period. The relatively high flux density and low dispersion measure of PSR J2241-5236 makes it an excellent candidate for high precision timing experiments. The gamma-rays of 1FGL J2241.9-5236 have a spectrum that is well modelled by a power law with exponential cutoff, and phasebinning with the radio ephemeris results in a multi-peaked gamma-ray pulse profile. Observations with Chandra have identified a coincident X-ray source within 0.1" of the position of the pulsar obtained by radio timing

Discovery of millisecond pulsars in radio searches of southern Fermi LAT sources

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