RXTE ASM的双SSC联合直接解调成像

DIRECT DEMODULATION IMAGING ANALYSIS OF THE COMBINED TWO SETS OF SSC DATA OF RXTE ASM

利用直接解调成像方法对RXTEASM两个指向相同的扫描阴影照像机 (SSC)的观测数据进行了联合成像分析 ,对Crab天区的研究结果表明 ,联合成像对源的分辨能力比单SSC成像有进一步提高 .并且还对银心附近含多个源的一个天区进行了联合成像 ,分别计算了成像所得的 3个X射线源的强度和位置坐标 ,并利用源与源之间的位置关系对RXTEASM定位定标中可能存在的方向定标系统误差作出估计 。

The imaging analysis results of the combined two sets of SSC (Scanning Shadow Camera) data of RXTE ASM using the direct demodulation method are presented in this paper. An analysis of the sky region of the Crab constellation shows that the image quality of the combined two SSC data sets is better than that of the single SSC data. In addition, the result of a region near the galactic center is also presented. The intensities and coordinates of three X ray point sources in this region are determined by the direct demodulation method. Moreover, both the systematic errors in the calibration of pointing directions of RXTE ASM and the errors of the coordinates obtained by the direct demodulation method have been estimated. From the bright point sources, the errors of coordinates given by the direct demodulation method are smaller than those given by the least square theoretical fit.