Improved count of radio sources at 1400 MHz

Details Improved count of radio sources at 1400 MHz Improved count of radio sources at 1400 MHz

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....36..273f&link_type=abstract

Astronomy and Astrophysics, vol. 36, no. 2, Nov. 1974, p. 273-278. Research supported by the National Research Council of Canad

Astronomy and Astrophysics

Astronomy

46

Astronomical Models, Data Acquisition, Extragalactic Radio Sources, Microwave Emission, Microwave Spectra, Radiant Flux Density, Counting, Decimeter Waves, Error Analysis, Quasi-Steady States, Radio Observation, Radio Sources (Astronomy), Red Shift, Tables (Data)

Scientific paper

New observations at 1400 MHz with the NRAO 300-ft telescope have provided a comparison between the flux-density scales of the BDFL, Davis, Maslowski and Westerbork surveys. The flux-density adjustments determined from these new observations essentially remove the reported clustering of extragalactic sources based on the differences among these surveys at a source density of about 500 per sr. The counts at 408, 1400, 2700 and 5000 MHz exhibit significant differences which can be explained by a variation of the effective spectral index of sources with flux density. The required variation is consistent with observations of individual sources. The corrected count of sources at 1400 MHz between .01 and 100 Jy is compared with evolutionary and steady-state cosmological models. A steady-state model may be compatible with the count only if QSS redshifts greater than 0.5 are mostly not cosmological and the relative deficiency of intense sources with steep spectral index is due to local source clustering.

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