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German Receiver for Astronomy at THz Frequencies - GREAT...

German Receiver for Astronomy at THz Frequencies - GREAT

Modular dual-channel heterodyne receiver for high-resolution spectroscopy with Stratospheric Observatory for Infrared Astronomy (SOFIA)

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    GREAT GREAT Presentation Transcript

    • MPIfR KOSMA MPS DLR-PF ATM 1-5 THz, 14 km altitude German Receiver for Astronomy at THz FrequenciesR.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR heterodyne receiver KOSMA MPS DLR-PF GREAT is a heterodyne spectrometer for FIR (THz) astronomy • as a spectrometer, GREAT analyses the frequency information carried in the astronomical signal.  much as you tune your radio to the frequency of your favorite station, we operate GREAT at selected frequencies of astronomical interests !! all molecules, atoms have their characteristic frequency footprints !!R.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR heterodyne principle KOSMA MPS DLR-PF GREAT is a heterodyne spectrometer for FIR (THz) astronomy • as a spectrometer, GREAT analyses the frequency information carried in the astronomical signal.  much as you tune your radio to the frequency of your favorite channel, we operate GREAT at selected frequencies of astronomical interests !! all molecules, atoms have their characteristic frequency footprint !! • switching on your radio, you listen to the „heterodyne principle“ which describes the generation of new frequencies by mixing two frequencies  applied to GREAT, this describes the down- conversion from THz to GHz frequencies, where the signal processing takes place. Greek roots: hetero- "different", and dyn- "power" (cf. dynamis, dunamis)R.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR Far-Infrared spectroscopy ? KOSMA MPS DLR-PF GREAT is a heterodyne spectrometer for FIR (THz) astronomy extracted from www.sura.org The FIR is the scientifically most promising, but so far widely underutilized part of the electromagnetic spectrum FIR is terra incognita because: • lack of suitable technologies (but the „terahertz gap“ is slowly closing..) • Earth‘s atmosphere efficiently absorbs THz photons from space. Science must be performed from space or from high-flying platforms: SOFIAR.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR Why observe with SOFIA ? KOSMA MPS DLR-PFIn the stratosphere the atmosphere becomes transparent to most (not all) FIRR.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR KOSMA MPS German REceiver for Astronomy at Terahertz frequencies DLR-PF Channel Frequencies [THz] Astronomical lines of interest (13) + low-frequency #1 1.25 – 1.50 [NII], CO(12-11), CO(13-12), HCN(17-16), H2D low-frequency #2 1.82 – 1.92 [CII], CO(16-15) 2.4 – 2.7 HD, OH( 3/2), CO(22-21), CO(23-22) 2 (13) mid-frequency high-frequency  4.7 [OI]R.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR KOSMA Our first science flight MPS DLR-PF Press release on April 07 GREAT observed the fine-structure line of ionized carbon [CII] at 1.9 THz and of warm carbon monoxid CO(13-12) at 1.5 THz towards M17SW, a molecular cloud prominently forming new massive stars.R.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR KOSMA GREAT dips into cradle of star formation MPS DLR-PF CO J=11-10 G5.89 : a cluster of massive stars in the making Cloud collapse is associated with energetic outflows that can be studied with GREAT/SOFIA Image: Spitzer/GLIMPSE 8 µmR.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR KOSMA The circum-nuclear disk in the GC MPS DLR-PF a massive gas disk is rotating around & feeding the black hole in the Galactic center CO(11-10) observed with GREAT GREAT will help constraining the physical conditions of the gas carbon monoxid (CO) in orbit around the central mass reservoir, feeding the nucleusR.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR … the next frontier: HD 2.7 THz KOSMA MPS DLR-PF While closing the THz gap! – we push GREAT into new territories, namely spectroscopy beyond 2 THz As we speak, our novel 2.7 THz detector is commissioned in the lab (tour) Why is this so exciting?  because observations of hydrogen deuteride HD become possible Well…  but: deuterium is only produced in the Big Bang, therefore does serve as chemical clock of the evolution of the universe Our chemical networks tell us that HD is likely to be the  best tracer of the cold ISM (molecular hydrogen is not observable)  best tracer of the late star forming process (latest freeze-out)R.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR KOSMA Outlook and Ongoing Upgrades MPS DLR-PF  while looking forward to our basic science flights in July & September  we are preparing for the next frequency extension: H-channel at 4.6 THz ([OI])  we have launched the instrument’s first major upgrade into a compact array: upGREAT to operate simultaneously 14 pixels at 1.9-2.5 THz and 7 pixels at 4.7 THzR.Güsten SOFIA Media Day - June 08, 2011
    • MPIfR KOSMA the GREAT consortium MPS DLR-PF GREAT is developed by the Max-Planck-Institut für Radioastronomie and the Universität zu Köln, in collabo- ration with the MPI for Solar System Research and the DLR Institute for Planetary Research, financed by the participating institutes, the Max-Planck-Society and Deutsche Forschungsgemeinschaft, supported by DLR. Principal Investigator Project Management Co-Investigators Rolf Güsten Stefan Heyminck (MPIfR) Jürgen Stutzki (KOSMA) MPI für Radioastronomie Paul Hartogh (MPS) Auf dem Hügel 69 Heinz-Wilhelm Hübers (DLR-PF) 53121 Bonn, Germany rguesten@mpifr.de For more information: http://www.mpifr.de/div/submmtech/heterodyne/great/greatmain.htmlR.Güsten SOFIA Media Day - June 08, 2011