310 citations · 6.5k across the 139 of their papers we have counts for
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The upGREAT dual frequency heterodyne arrays for SOFIA
C. Risacher, R. Güsten, J. Stutzk +30
We present the performance of the upGREAT heterodyne array receivers on the SOFIA telescope after several years of operations. This instrument is a multi-pixel high resolution (R >…
The upGREAT 1.9 THz multi-pixel high resolution spectrometer for the SOFIA Observatory
C. Risacher, R. Guesten, J. Stutzki +19
We present a new multi-pixel high resolution (R >10^7) spectrometer for the Stratospheric Observatory for Far-Infrared Astronomy (SOFIA). The receiver uses 2 x 7-pixel subarrays in…
First 230 GHz VLBI Fringes on 3C 279 using the APEX Telescope
J. Wagner, A. L. Roy, T. P. Krichbaum +52
We report about a 230 GHz very long baseline interferometry (VLBI) fringe finder observation of blazar 3C 279 with the APEX telescope in Chile, the phased submillimeter array (SMA)…
Submillimeter Polarimetry with PolKa, a reflection-type modulator for the APEX telescope
Helmut Wiesemeyer, Talayeh Hezareh, Ernst Kreysa +6
Imaging polarimetry is an important tool for the study of cosmic magnetic fields. In our Galaxy, polarization levels of a few up to 10\% are measured in the submillimeter dus…
Early Science with SOFIA, the Stratospheric Observatory for Infrared Astronomy
E. T. Young, E. E. Becklin, P. M. Marcum +38
The Stratospheric Observatory for Infrared Astronomy (SOFIA) is an airborne observatory consisting of a specially modified Boeing 747SP with a 2.7-m telescope, flying at altitudes…
High-resolution wide-band Fast Fourier Transform spectrometers
Bernd Klein, Stefan Hochgürtel, Ingo Krämer +3
We describe the performance of our latest generations of sensitive wide-band high-resolution digital Fast Fourier Transform Spectrometer (FFTS). Their design, optimized for a wide…