A third 1415 MHz survey with the Westerbork Synthesis Radio Telescope: the 5C2 region (part I).
Abstract
Summary. The 5C2 region, observed originally with the Cambridge One-Mile Telescope at 408 MHz, has been reobserved at 1415 MHz. The resulting source list contains 238 sources with attenuated flux densities exceeding the catalogue limit of 6.25 m.f.u. Out of a total of 190 5C2 sources (i.e. all 5C2 sources within the 10 dB attenuation contour of the present survey) 128 were detected with flux densities above the catalogue limit. Another 22 5C2 sources were detected with flux densities below the catalogue limit. A discussion is given of the procedures used for determining source parameters. Special attention has been given to the determination of flux density and angular size, as well as to the question of completeness of the source list as a function of flux density and angular size. Below attenuated flux densities of about 12.5 m.f.u. both systematic underestimation of flux (fensities and selection against extended sources cannot be neglected and must be accounted for. A detailed discussion of source counts, spectral index distributions and angular size distributions will be given in a following paper. Key words: radio source survey flux densities and angular sizes of extended sources - completeness of source list
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1975
- Bibcode:
- 1975A&A....38...87K
- Keywords:
-
- Radiant Flux Density;
- Radio Sources (Astronomy);
- Size Determination;
- Angular Distribution;
- Astronomical Maps;
- Attenuation Coefficients;
- Calibrating;
- Data Reduction;
- Fourier Transformation;
- Position Errors;
- Radio Telescopes;
- Tables (Data);
- Astronomy