Book ; Online: Confirming ALMA Calibration using Planck and ACT Observations
2021
Abstract: We test the accuracy of ALMA flux density calibration by comparing ALMA flux density measurements of extragalactic sources to measurements made by the Planck mission; Planck is absolutely calibrated to sub-percent precision using the dipole signal ... ...
Abstract | We test the accuracy of ALMA flux density calibration by comparing ALMA flux density measurements of extragalactic sources to measurements made by the Planck mission; Planck is absolutely calibrated to sub-percent precision using the dipole signal induced by the satellite's orbit around the solar system barycenter. Planck observations ended before ALMA began systematic observations, however, and many of the sources are variable, so we employ measurements by the Atacama Cosmology Telescope (ACT) to bridge the two epochs. We find the ALMA flux density scale (based on observations of Uranus) is consistent with Planck; for instance ALMA flux densities in Band 3 ($\sim$100 GHz) average $0.99 \pm 0.02$ times those measured by Planck. We also test the absolute calibration of both ACT and the South Pole Telescope (SPT), again with reference to Planck, as well as the internal consistency of Planck, ACT and SPT measurements of compact sources. Comment: 24 pages, 4 figures, 6 tables, submitted to ApJ |
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Keywords | Astrophysics - Instrumentation and Methods for Astrophysics |
Subject code | 520 ; 551 |
Publishing date | 2021-02-09 |
Publishing country | us |
Document type | Book ; Online |
Database | BASE - Bielefeld Academic Search Engine (life sciences selection) |
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