Zusammenfassende Gesamtbeurteilung

Kellermann, Kerstin

doi:10.1007/978-3-322-82149-2_8

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2016

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“…Indeed the low-frequency flux density scale has long been quite uncertain, as summarized in the Baars77 paper. Table 7 of that paper shows the ratio of their scale for the 'absolute' sources to the scales of Conway, Kellermann, and Long (1963), Kellermann (1964), Baars, Mezger, and Wendker (1965), Hartsuijker (1972), andWills (1973).…”

Section: Introductionmentioning

confidence: 99%

An Accurate Flux Density Scale from 50 MHz to 50 GHz

Perley,

Butler

2016

Preprint

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The flux density scale of Perley and Butler (2013) is extended downwards to ∼ 50 MHz by utilizing recent observations with the Karl G. Jansky Very Large Array (VLA) a of twenty sources between 220 MHz and 48.1 GHz, and legacy VLA observations at 73.8 MHz. The derived spectral flux densities are placed on an absolute scale by utilizing the Baars et al. (1977) values for Cygnus A (3C405) for frequencies below 2 GHz, and the Mars-based polynomials for 3C286, 3C295, and 3C196 from Perley and Butler (2013) above 2 GHz. Polynomial expressions are presented for all 20 sources, with accuracy limited by the primary standards to 3 -5% over the entire frequency range. Corrections to the scales proposed by Perley and Butler (2013), and by Scaife and Heald (2012) are given.

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