The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII): An Experiment for High Angular Resolution in the Far-Infrared

The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is a new balloon-borne far-infrared interferometer, being designed to provide spatially-resolved spectroscopy in the far infrared (30-90 μm). The combination of an 8-meter baseline with a double-Fourier Michelson interferom...

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Veröffentlicht in:	Publications of the Astronomical Society of the Pacific 2014-07, Vol.126 (941), p.660-673
Hauptverfasser:	Rinehart, S. A., Rizzo, M., Benford, D. J., Fixsen, D. J., Veach, T. J., Dhabal, A., Leisawitz, D. T., Mundy, L. G., Silverberg, R. F., Barry, R. K., Staguhn, J. G., Barclay, R., Mentzell, J. E., Griffin, M., Ade, P. A. R., Pascale, E., Klemencic, G., Savini, G., Juanola-Parramon, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Cameras Control systems Cryostats Delay lines Far infrared radiation Instrumentation Interferometers Light beams Sensors Signal noise Wavelengths
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Beschreibung
Zusammenfassung:	The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is a new balloon-borne far-infrared interferometer, being designed to provide spatially-resolved spectroscopy in the far infrared (30-90 μm). The combination of an 8-meter baseline with a double-Fourier Michelson interferometer allows the identification and separation of closely-spaced astronomical sources, while also providing a low-resolution spectrum for each source. In this wavelength range, BETTII will provide subarcsecond angular resolution, a capability unmatched by other far-infrared facilities. This paper provides an overview of the entire design of the BETTII experiment, with a short discussion of the predicted performance on flight.
ISSN:	0004-6280 1538-3873
DOI:	10.1086/677402