论文标题
球状群集NGC 6522中PSR J1803-3002A的宽带监测观察结果
Wideband Monitoring Observations of PSR J1803-3002A in the Globular Cluster NGC 6522
论文作者
论文摘要
我们报告了PSR J1803-3002a的第一个宽带监测观测值，这是球状簇NGC 6522中相对明亮的毫秒脉冲星，自旋周期为7.1 ms，没有已知的二进制伴侣。这些观察结果是使用Parkes 64 m射电望远镜，其超宽带低（UWL）接收器系统覆盖704至4032 MHz。我们确认PSR J1803-3002A是位于群集中心附近的一个孤立的毫秒脉冲星，并探测了脉冲星在宽观测带上的发射特性。平均脉冲轮廓由三个组件组成，外部成分在较高的频率下变得越来越突出，并且在观察到的频段上脉冲发射的脉冲发射的平均光谱指数。分数线性和圆形极化随着频率的增加而增加，这对于脉冲星而言是不寻常的。我们确定脉冲星的法拉第旋转度量为-107 +/- 6 RAD M-2。 PSR J1803-3002a是银河平面中的远处脉冲星，但是没有证据表明我们的观察结果中脉冲拓宽。这些结果证明了超宽带接收和信号处理系统的功能。
We report the first wideband monitoring observations of PSR J1803-3002A, a relatively bright millisecond pulsar in the globular cluster NGC 6522 with a spin period of 7.1 ms and no known binary companion. These observations were performed using the Parkes 64-m radio telescope with the Ultra-Wideband Low (UWL) receiver system, which covers 704 to 4032 MHz. We confirm that PSR J1803-3002A is an isolated millisecond pulsar located near the cluster center and probe the emission properties of the pulsar over the wide observed band. The mean pulse profile consists of three components, with the outer components becoming more prominent at higher frequencies, and a mean spectral index for the pulsed emission of -1.66+/-0.07 over the observed band. The fractional linear and circular polarization increase with increasing frequency, which is unusual for pulsars. We determine a Faraday rotation measure of -107+/-6 rad m-2 for the pulsar. PSR J1803-3002A is a distant pulsar in the Galactic plane, but there is no evidence of pulse broadening due to interstellar scattering in our observations. These results demonstrate the power of ultra-wideband receiving and signal processing systems.
