The Molonglo Deep Sky Survey of Radio Sources. III. Source Counts

Robertson, J. G.

doi:10.1071/ph770241

Cited by 8 publications

(7 citation statements)

References 2 publications

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“…Reference codes. be82: Benn et al (1982); gr88: Grueff (1988); ro77: Robertson (1977). Table 8 Euclidean normalized differential 15.2 GHz source counts from the 9C survey (Waldram et al 2003(Waldram et al , 2009…”

Section: Discussionmentioning

confidence: 99%

Radio and millimeter continuum surveys and their astrophysical implications

Zotti

Massardi

Negrello

et al. 2009

Astron Astrophys Rev

262

244

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We review the statistical properties of the main populations of radio sources, as emerging from radio and millimeter sky surveys. Recent determinations of local luminosity functions are presented and compared with earlier estimates still in widespread use. A number of unresolved issues are discussed. These include: the (possibly luminositydependent) decline of source space densities at high redshifts; the possible dichotomies between evolutionary properties of low-versus high-luminosity and of flat-versus steepspectrum AGN-powered radio sources; and the nature of sources accounting for the upturn of source counts at sub-mJy levels. It is shown that straightforward extrapolations of evolutionary models, accounting for both the far-IR counts and redshift distributions of star-forming galaxies, match the radio source counts at flux-density levels of tens of µJy remarkably well. We consider the statistical properties of rare but physically very interesting classes of sources, such as GHz Peak Spectrum and ADAF/ADIOS sources, and radio afterglows of γ-ray bursts. We also discuss the exploitation of largearea radio surveys to investigate large scale structure through studies of clustering and the Integrated Sachs-Wolfe effect. Finally we briefly describe the potential of the new and forthcoming generations of radio telescopes. A compendium of source counts at different frequencies is given in an appendix.

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Section: Discussionmentioning

confidence: 99%

Radio and millimeter continuum surveys and their astrophysical implications

Zotti

Massardi

Negrello

et al. 2009

Astron Astrophys Rev

262

244

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“…where the differential slope of the distribution of number of sources as a function of flux density becomes markedly less negative than -2.5 (Robertson 1977c). The increased proportion of flat spectrum sources at low flux density is consistent with the fact that source counts at higher frequencies (Wall and Cooke 1975) fall less rapidly below the "Euclidean" slope than at 408 MHz (Robertson 1977c). The present result would seem to indicate that the counts of steep spectrum sources at 408 MHz are falling more steeply below the "Euclidean" slope than previously recognized.…”

Section: Discussionmentioning

confidence: 91%

“…The changes occur in the region where the radio source counts begin to fall sharply below the so-called "Euclidean" slope i.e. where the differential slope of the distribution of number of sources as a function of flux density becomes markedly less negative than -2.5 (Robertson 1977c). The increased proportion of flat spectrum sources at low flux density is consistent with the fact that source counts at higher frequencies (Wall and Cooke 1975) fall less rapidly below the "Euclidean" slope than at 408 MHz (Robertson 1977c).…”

Section: Discussionmentioning

confidence: 99%

Radio and Optical Spectra of Sources from the Molonglo Deep Survey

Murdoch¹,

White²

1977

Publ. Astron. Soc. Aust.

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We present here preliminary results of further radio and optical work being carried out on the Molonglo Deep Survey (Robertson 1977a, b, c) which reaches a density of ∼ 20,000 sources per sterad at a limiting flux density of 84 mJy at 408 MHz in three small areas of sky at declinations -20° and -62°. The position errors range from 4 to 15 arc sec r.m.s. depending on flux density. Optical identifications are being made by G. W. using the Palomar Sky Survey in the -20° region and the ESO and SRC surveys in the -62° region. In the latter case, where only one colour is available more accurate positions are necessary to identify QSO candidates. The Fleurs synthesis telescope is being used to obtain accurate positions.

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“…Robertson (1976c), in comparing his deep surveys with the Cambridge 5C surveys, found that the Molonglo catalogues contain more sources than the Cambridge, above equivalent levels, by a factor of 1.29. The formal significance is about 1% but, in view of the increased probability of calibration discordances between two quite different catalogues, this indication of anisotropy is very weak.…”

Section: Mc1mentioning

confidence: 99%

The Molonglo Radio Source Surveys at 408 MHz

Mills

1977

Symp. - Int. Astron. Union

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One of the basic programs undertaken with the 1 mile Cross-type radio telescope at the Molonglo Radio Observatory has been a systematic survey of the sky south of +18° declination. Commencing in late 1967, the survey has been continuing at a low priority until it is now complete to a declination of −85°, except for some small areas affected by interference or instrumental problems which are being re-observed. A program of ‘deep surveys’ is also being undertaken; this involves multiple observations within narrow strips at selected declinations. The signal-to-noise ratio is some three to five times better than in normal surveying and the confusion limit is approached.

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The Molonglo Deep Sky Survey of Radio Sources. III. Source Counts

Cited by 8 publications

References 2 publications

Radio and millimeter continuum surveys and their astrophysical implications

Radio and millimeter continuum surveys and their astrophysical implications

Radio and Optical Spectra of Sources from the Molonglo Deep Survey

The Molonglo Radio Source Surveys at 408 MHz

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