Offline Correction of Atmospheric Effects on Single-Dish Radio Spectroscopy
| Autor: | Harold Francke, Kanako Sugimoto, Takeshi Nakazato, Neil M. Phillips, Tsuyoshi Sawada, Yusuke Miyamoto, Laura Gomez, Suminori Nishie, Jeffrey G. Mangum, Yoshito Shimajiri, Chin-Shin Chang |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
FOS: Physical sciences Astronomy and Astrophysics Residual 01 natural sciences Submillimeter Array Submillimetre astronomy Transmission (telecommunications) Space and Planetary Science Observatory 0103 physical sciences Environmental science Millimeter Spectroscopy Astrophysics - Instrumentation and Methods for Astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) 010303 astronomy & astrophysics Microwave 0105 earth and related environmental sciences Remote sensing |
| Popis: | We present a method to mitigate the atmospheric effects (residual atmospheric lines) in single-dish radio spectroscopy caused by the elevation difference between the target and reference positions. The method is developed as a script using the Atmospheric Transmission at Microwaves (ATM) library built into the Common Astronomy Software Applications (CASA) package. We apply the method to the data taken with the Total Power Array of the Atacama Large Millimeter/submillimeter Array. The intensities of the residual atmospheric (mostly O3) lines are suppressed by, typically, an order of magnitude for the tested cases. The parameters for the ATM model can be optimized to minimize the residual line and, for a specific O3 line at 231.28 GHz, a seasonal dependence of a best-fitting model parameter is demonstrated. The method will be provided as a task within the CASA package in the near future. The atmospheric removal method we developed can be used by any radio/millimeter/submillimeter observatory to improve the quality of its spectroscopic measurements. 21 pages, 12 figures, accepted for publication in PASP |
| Databáze: | OpenAIRE |
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