论文标题
单次射电望远镜检测和分析弱的无线电源的方法
Methods for detection and analysis of weak radio sources with single-dish radio telescopes
论文作者
论文摘要
对于单次射电望远镜而言，MJY/Sub-MJY点源的检测是一个重大挑战。从GRB或宇宙学距离的其他来源的余辉的检测或上限是限制源建模的重要手段。 使用Sardinia射电望远镜（SRT），我们比较了从已知源位置周围的栅格图检测到微弱的无线电源的三种方法的灵敏度和鲁棒性：智能快速外观方法，源源提取方法（典型的高能量天文学的典型），以及适合2-d高斯人。我们开发了一种用于分析用于分析点的无线电源的Python代码，该源应用于SRT C波段（6.9 GHz）对未检测到的源（181201a和190114c的GRB余热）以及检测到的银河X射线二进制二进制二进制GRS 1915+105。 我们对不同检测方法的比较分析使大量使用模拟作为对实际无线电观察结果的有用补充。 SRT数据分析的最佳方法是与2-D高斯的拟合，因为它推动了单次观察的灵敏度限制（相对于更传统的技术），至〜1.8 mjy，与初始值相比提高了约40％。该分析表明，尤其是对于微弱的来源 - 扫描区域前或后爆炸的良好地图至关重要。
The detection of mJy/sub-mJy point sources is a significant challenge for single-dish radio telescopes. Detection or upper limits on the faint afterglow from GRBs or other sources at cosmological distances are important means of constraining the source modeling. Using the Sardinia Radio Telescope (SRT), we compare the sensitivity and robustness of three methods applied to the detection of faint radio sources from raster maps around a known source position: the smart quick-look method, the source extraction method (typical of high-energy astronomy), and the fit with a 2-D Gaussian. We developed a Python code specific for the analysis of point-like radio sources applied to the SRT C-band (6.9 GHz) observations of both undetected sources (GRB afterglows of 181201A and 190114C) and the detected Galactic X-ray binary GRS 1915+105. Our comparative analysis of the different detection methods made extensive use of simulations as a useful complement to actual radio observations. The best method for the SRT data analysis is the fit with a 2-D Gaussian, as it pushes down the sensitivity limits of single-dish observations -- with respect to more traditional techniques -- to ~ 1.8 mJy, improving by ~ 40 % compared with the initial value. This analysis shows that -- especially for faint sources -- good maps of the scanned region pre- or post-outburst are essential.
