Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/23917
Title: | Absolute Calibration of the Radio Astronomy Flux Density Scale from 22 to 43 GHz using Planck | Authors: | Butler, Bryan J. Partridge, R. Bruce Perley, Richard A. Stevens, Jamie B. Lopez-Caniego, Marcos Rocha, Graca Walter, Ben Z. ZACCHEI, Andrea |
Issue Date: | 2015 | Volume: | American Astronomical Society Meeting Abstracts #225 | First Page: | 331 | 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. <P /> | Conference Name: | 225th Meeting of the American Astronomical Society | Conference Place: | Seattle, Washington, USA | Conference Date: | 4-8 January, 2015 | URI: | http://hdl.handle.net/20.500.12386/23917 | URL: | https://aas.org/sites/default/files/2020-01/AAS_225_Abstracts.pdf | Bibcode ADS: | 2015AAS...22531103B | Fulltext: | open |
Appears in Collections: | 3.02 Abstract in Atti di convegno |
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AAS_225_Abstracts_311-03.pdf | pdf editoriale | 96.79 kB | Adobe PDF | View/Open |
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