GREAT Early Results Göran Sandell, on behalf of the GREAT Consortium.

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Presentation transcript:

GREAT Early Results Göran Sandell, on behalf of the GREAT Consortium

GREAT installed on SOFIA

SHORT SCIENCE 2 (SS2) 3 flights in early April + one setup flight (OCF4) GREAT SS2 configuration: – L# – 1.39 THz (a), 1.43 – 1.52 THz (b) – L# – 1.92 THz Improved Bandwidth – now 1.5 GHz Better noise temperature

Noise performance & bandwidth  SSB-noise performance vs. LO frequency  gaps are due to LO power limitations  lower performance between 1840 and 1885 GHz is due to LO noise contributions  clean overall band-pass (right hand side)  usable bandwidth up to 1.5GHz

Performance Summary Channel Topic L #1aL #1bL #2 RF-Range [THz]1.25 – – – 1.90 IF-Bandwidth [GHz]1.5 IF-Center [GHz]1.6 – 2.3 (variable) SSB-Noise-temp. [K]2000K – 3500K 2500K – 8000K Beam-size [arcsec] ~22~16 Allen time [s]spectroscopic: > 100, total-pow. > 15

GREAT Short Science one observatory characterization flight hardware & procedures (prepared during line ops & in HIL/SIL) worked fine, but operation troubled by serious softwareissues finally, on Saturn & galactic PDRs, we determined & verified: – boresight offsets GREAT to FPI – Z-focus offset GREAT to FPI – GREAT observing modes pointed, raster, on-the-fly, in total power and chopped observing modes in both, continuum and spectrospopy modes message: a single commissioning flight for an instrument with the complexity of GREAT (blind from ground) is sub-critical. three short science flights

GREAT Short Science science demonstration was amazingly successful during our three SS2 flights – 7-8 science projects completed (to the extent possible) – 2-3 projects do need more integration time, will be re-scheduled in July science will be published in A&A special volume in autumn, with technical contributions desribing GREAT status of data processing – calibration pipeline (atmospheric models) more demanding than expected [lack of calibrated water readings from onboard monitor painful] – improving on shortcomings (header information, timing)