THE SIXTH VLBA CALIBRATOR SURVEY: VCS6
THE SIXTH VLBA CALIBRATOR SURVEY: VCS6
复制标题
DOI：
10.1088/0004-6256/136/2/580
复制
发表时间：
2008-01
期刊：
影响因子：
--
通讯作者：
L. Petrov;Y. Kovalev;Y. Kovalev;E. Fomalont;David Gordon
中科院分区：
文献类型：
--
作者：
L. Petrov;Y. Kovalev;Y. Kovalev;E. Fomalont;David Gordon
本文介绍了甚长基线阵列（VLBA）校准测量的第六部分。它载有264个源的位置和地图，其中169个源以前没有用甚长基线干涉测量法观测到。本次调查，基于两个24小时VLBA观测会议，重点是（1）改进先前VLBA校准巡天中观测到的95个源的位置，这些源要么具有非常大的先验位置误差，要么观测时间不够长，无法获得可靠的位置;（2）观测剩余的新的平谱源，其预测的相关通量密度在100- 1000之间。200 mJy，在以前的调查中没有观察到。源的位置来自天体测量分析的群延迟确定在2.3和8.6 GHz的频带使用的Calc/Solve软件包。VCS 6源位置目录、相关通量密度与投影基线长度的关系图、自然加权CLEAN图像的等值线图和拟合文件以及校准的可见度函数文件可在http://vlbi.gsfc.nasa.gov/vcs6网站上获得。
This paper presents the sixth part of the Very Long Baseline Array (VLBA) Calibrator Survey. It contains the positions and maps of 264 sources of which 169 were not previously observed with very long baseline interferometry. This survey, based on two 24 h VLBA observing sessions, was focused on (1) improving positions of 95 sources from previous VLBA Calibrator Surveys that were observed either with very large a priori position errors or were observed not long enough to get reliable positions and (2) observing remaining new flat-spectrum sources with predicted correlated flux density in the range 100–200 mJy that were not observed in previous surveys. Source positions were derived from astrometric analysis of group delays determined at the 2.3 and 8.6 GHz frequency bands using the Calc/Solve software package. The VCS6 catalog of source positions, plots of correlated flux density versus projected baseline length, contour plots and fits files of naturally weighted CLEAN images, as well as calibrated visibility function files, are available on the Web at http://vlbi.gsfc.nasa.gov/vcs6.