Mr. Amilcar Torres-Quijano Profile

Amilcar Torres-Quijano

at Univ of Texas at San Antonio

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Proceedings Article | 9 February 2021 Poster + Paper

Mid-infrared drift scanning up the SNR slope

Christopher Packham, Amílcar Torres-Quijano, Sergio Fernandez Acosta

Proceedings Volume 11447, 114477P (2021) https://doi.org/10.1117/12.2588815

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Mid-infrared (MIR) observations are typically accomplished from the ground through oscillating the secondary mirror a few times a second. This chopping serves to remove the fast time variable components of (a) sky variation and (b) array background. However, there is a significant price to pay for this, including reduced on-object photon collection time, stringent demands on the secondary mirror, nodding the telescope to remove the radiative offset imprinted by the chopping, and an often-fixed chop-frequency regardless of the sky conditions in the actual observations. Worse, in the era of 30m telescopes it is wholly impracticable to chop the secondary mirror. If the array is stable enough, drift scanning holds the promise to remove the necessity of chopping. In this paper we report our experiments using the CanariCam MIR instrument on the 10.4m GranTeCan and the implications to future instruments and experiments.

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