Absolute Calibration of the Radio Astronomy Flux Density Scale from 22 to 43 GHz using Planck
Date Issued
2015
Author(s)
Butler, Bryan J.
•
Partridge, R. Bruce
•
Perley, Richard A.
•
Stevens, Jamie B.
•
Lopez-Caniego, Marcos
•
Rocha, Graca
•
Walter, Ben Z.
•
Abstract
The Planck mission detected hundreds of extragalactic radio sources at frequencies from 28 to 857 GHz. Since Planck's calibration is absolute, based on the satellite's annual motion around the Sun, and since its beams are well-characterized at the sub-percent levels, Planck's flux density measurements are absolute to percent-level accuracy. We have made coordinated Planck, VLA and ATCA observations of ~60 strong, unresolved sources in order to compare Planck's absolute calibration to that used by these two interferometers at 22, 28 and 43 GHz. The flux densities of the sources used to calibrate the VLA observations are taken from Perley and Butler (2013), which is fundamentally based on models of the planet Mars calibrated via WMAP observations. The flux densities of the sources used to calibrate the ATCA observations are based on models of the planet Uranus. Despite the scatter introduced by the variability of many of the sources, the three flux density scales are determined to agree to 1-2% accuracy.
Coverage
American Astronomical Society Meeting Abstracts #225
Start page
331
Conferenece
225th Meeting of the American Astronomical Society
Conferenece place
Seattle, Washington, USA
Conferenece date
4-8 January, 2015
Ads BibCode
2015AAS...22531103B
Rights
open.access
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