NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-25 T02:44:56 PDT
Help | Comment | NED Home

For refcode 2004MNRAS.354..485B:
Retrieve 176 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 2004MNRAS.354..485B The radio source population at high frequency: follow-up of the 15-GHz 9C survey Bolton, R. C.; Cotter, G.; Pooley, G. G.; Riley, J. M.; Waldram, E. M.; Chandler, C. J.; Mason, B. S.; Pearson, T. J.; Readhead, A. C. S. Abstract. We have carried out extensive radio and optical follow-up of 176 sources from the 15-GHz 9th Cambridge survey. Optical identifications have been found for 155 of the radio sources; optical images are given with radio maps overlaid. The continuum radio spectrum of each source spanning the frequency range 1.4-43 GHz is also given. Two flux-limited samples are defined, one containing 124 sources complete to 25 mJy and one of 70 sources complete to 60 mJy. Between one-fifth and one-quarter of sources from these flux-limited samples display convex radio spectra, rising between 1.4 and 4.8 GHz. These rising-spectrum sources make up a much larger fraction of the radio source population at this high selection frequency than in lower frequency surveys. We find that by using non-simultaneous survey flux density measurements at 1.4 and 15 GHz to remove steep-spectrum objects, the efficiency of selecting objects with spectra rising between 1.4 and 4.8 GHz (as seen in simultaneous measurements) can be raised to 49 per cent without compromising the completeness of the rising-spectrum sample. Keywords: surveys, galaxies: active, radio continuum: general
Retrieve 176 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home