Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...73..103o&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 73, no. 1, April 1988, p. 103-123.
Astronomy and Astrophysics
Astronomy
16
Astronomical Catalogs, Cosmology, Radio Sources (Astronomy), Astronomical Maps, Centimeter Waves, Data Sampling, Radio Galaxies
Scientific paper
The paper presents a deep 92 cm survey down to 4.5 mJy (5 sigma) carried out with the Westerbork Synthesis Radio Telescope (WSRT) of a field in Lynx, previously observed at three other radio frequencies: 6, 21, and 49 cm. The observations were made in the redundancy mode, which makes it possible to achieve a high dynamic range. In total, 384 sources above a 5 sigma peak flux limit were detected, of which 337 form a complete sample. For the 92-cm complete sample, the spectral index distribution was determined as a function of 92 cm and 21 cm flux density. The fainter sources have significantly flatter spectra between 92 cm and 21 cm than the brighter sources, with a median spectral index that changes from about 0.7 above 25 mJy to about 0.55 below 25 mJy (at 21 cm). A similar decrease is seen as a function of 92 cm flux density. A much smaller effect is shown by the median spectral index between 49 and 21 cm. There is, therefore, clear evidence for a spectral turnover between 92 and 49 cm in a large fraction of the radio sources. From optical identifications it appears that the spectral turnover occurs primarily in the blue radio galaxies. The 327 MHz source counts above 4.75 mJy are presented.
Oort J. A. M.
Steemers J. G. W.
Windhorst Rogier A.
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