NRAO VLA Sky Survey
The NRAO VLA Sky Survey (NVSS) is a screening of the celestial north range of 40 ° south latitude in the radio range at 1.4 GHz . The aim of the investigation was to create a complete picture of the distribution of even weak and distant radio sources . The measurements for this were carried out between September 1993 and October 1996 with the radio telescopes of the Very Large Array in New Mexico (USA). The data were made freely available to all interested astronomers. Together with the HI Parkes All Sky Survey (HIPASS) recorded from Australia in the following years, a complete map of the sky in the area of the 21 cm line is now available.
2326 sections with sides of 4 ° × 4 ° were obtained, which cover the entire sky area accessible from the location of the observatory. The sections each have an angular resolution (half-width of the signals) of 45 angular seconds and depict the total intensity (I) and the linear polarization (Q and U). Each of these images was put together from more than 100 individual images.
A catalog of over 1.8 million discrete radio sources has also been published.
Web links
- The NRAO VLA Sky Survey. National Radio Astronomy Observatory (Charlottesville, Virginia, USA), accessed April 15, 2014 .