4GREAT -- a four-color receiver for high-resolution airborne terahertz spectroscopy
Carlos A. Dur\'an, Rolf G\"usten, Christophe Risacher, Andrej, G\"orlitz, Bernd Klein, Nicolas Reyes, Oliver Ricken, Hans-Joachim Wunsch,, Urs U. Graf, Karl Jacobs, Cornelia E. Honingh, J\"urgen Stutzki, Gert de, Lange, Yan Delorme, Jean-Michel Krieg, Dariusz C. Lis
TL;DR
4GREAT is a four-color terahertz receiver for SOFIA that enables simultaneous high-resolution spectroscopy across four frequency bands, enhancing observational capabilities in airborne astronomy.
Contribution
It introduces a novel four-band receiver system with independent detectors and co-aligned beams for advanced airborne terahertz spectroscopy.
Findings
Successful in-flight performance demonstrated
First light achieved in June 2018
Operational since SOFIA observing cycle 6
Abstract
4GREAT is an extension of the German Receiver for Astronomy at Terahertz frequencies (GREAT) operated aboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The spectrometer comprises four different detector bands and their associated subsystems for simultaneous and fully independent science operation. All detector beams are co-aligned on the sky. The frequency bands of 4GREAT cover 491-635, 890-1090, 1240-1525 and 2490-2590 GHz, respectively. This paper presents the design and characterization of the instrument, and its in-flight performance. 4GREAT saw first light in June 2018, and has been offered to the interested SOFIA communities starting with observing cycle 6.
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