A review of the atmospheric opacity at the Large Millimeter Telescope site and 210 GHz opacity measurements comparison

D. Ferrusca Sr.; J. Contreras; J. Cuazoson; D. Hiriart; E. Ibarra-Medel; S. Kurtz; D. Rojas; M. Velázquez

doi:10.1117/12.2629610

26 August 2022 A review of the atmospheric opacity at the Large Millimeter Telescope site and 210 GHz opacity measurements comparison

D. Ferrusca Sr., J. Contreras, J. Cuazoson, D. Hiriart, E. Ibarra-Medel, S. Kurtz, D. Rojas, M. Velázquez

Author Affiliations +

Proceedings Volume 12182, Ground-based and Airborne Telescopes IX; 121824F (2022) https://doi.org/10.1117/12.2629610
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Sierra Negra (SN) is the site of the 50-m diameter Large Millimeter Telescope (LMT) at an elevation of 4600 m.a.s.l. located in the state of Puebla in central México. The LMT hosts several heterodyne and continuum instruments in the bands from 3 mm to 1 mm wavelength, thus making it necessary to have continuous opacity measurements at the millimeter wavelengths. The site has been monitored in the past using a commercial 225 GHz opacity radiometer. The 210 GHz Survey radiometer is an instrument previously used to search for the best Mexican site for the LMT. The Survey radiometer is a compact and portable instrument that has proven its reliability in remote sites. Due to its low cost and compact architecture the Survey radiometer has the potential to be reproduced and taken to other candidate radio astronomical sites in particular, locations for ngVLA antennas in northern México. In this paper we present the results of the measurements taken with the 225 GHz radiometer. The statistical data are consistent and within the dispersion measurements taken in the past. We also present a review of the Survey radiometer and recent data taken at the LMT site with this instrument. Furthermore, we compare current Survey data with data set taken by the 225 GHz radiometer at SN.

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D. Ferrusca Sr., J. Contreras, J. Cuazoson, D. Hiriart, E. Ibarra-Medel, S. Kurtz, D. Rojas, and M. Velázquez "A review of the atmospheric opacity at the Large Millimeter Telescope site and 210 GHz opacity measurements comparison", Proc. SPIE 12182, Ground-based and Airborne Telescopes IX, 121824F (26 August 2022); https://doi.org/10.1117/12.2629610

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