The VLA Low-frequency Sky Survey
The VLA Low-frequency Sky Survey
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DOI：
10.1086/520719
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发表时间：
2007-09-01
影响因子：
5.3
通讯作者：
Erickson, W. C.
中科院分区：
文献类型：
--
作者：
Cohen, A. S.;Lane, W. M.;Erickson, W. C.
VLA 低频巡天 (VLSS) 以 74MHz（4 m 波长）频率对 delta=-30 度以北 3 pi sr 天空的 95% 进行了成像。分辨率始终为 8000 ( FWHM)，典型的均方根噪声水平近似于 0: 1 Jy 光束(1)。典型的点源检测极限为 0.7 Jy 光束(1)，到目前为止，已对近 70,000 个源进行了编目。此次勘测使用了 1998 年添加到 VLA 的 74MHz 系统。它需要新的成像算法来消除整个类似于 11.9 度视场的非常低频率下的大电离层畸变。本文描述了 VLSS 的观测和数据缩减方法，并介绍了调查图像和源目录。所有校准图像和源目录均可从 VLSS 网站获取，供天文学界使用。
The VLA Low- frequency Sky Survey (VLSS) has imaged 95% of the 3 pi sr of sky north of delta=-30 degrees at a frequency of 74MHz ( 4 m wavelength). The resolution is 8000 ( FWHM) throughout, and the typical rms noise level is approximate to 0: 1 Jy beam(1.) The typical point- source detection limit is 0.7 Jy beam(1,) and so far nearly 70,000 sources have been cataloged. This survey used the 74MHz system added to the VLA in 1998. It required new imaging algorithms to remove the large ionospheric distortions at this very low frequency throughout the entire similar to 11.9 degrees field of view. This paper describes the observation and data reduction methods used for the VLSS and presents the survey images and source catalog. All of the calibrated images and the source catalog are available from the VLSS Web site for use by the astronomical community.