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The Herschel-Heterodyne Instrument for the Far-Infrared (HIFI)
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2010 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 518, L6- p.Article in journal (Refereed) Published
Abstract [en]

Aims: This paper describes the Heterodyne Instrument for the Far-Infrared (HIFI) that was launched onboard ESA's Herschel Space Observatory in May 2009. Methods: The instrument is a set of 7 heterodyne receivers that are electronically tuneable, covering 480-1250 GHz with SIS mixers and the 1410-1910 GHz range with hot electron bolometer (HEB) mixers. The local oscillator (LO) subsystem comprises a Ka-band synthesizer followed by 14 chains of frequency multipliers and 2 chains for each frequency band. A pair of auto-correlators and a pair of acousto-optical spectrometers process the two IF signals from the dual-polarization, single-pixel front-ends to provide instantaneous frequency coverage of 2 × 4 GHz, with a set of resolutions (125 kHz to 1 MHz) that are better than 0.1 km s-1. Results: After a successful qualification and a pre-launch TB/TV test program, the flight instrument is now in-orbit and completed successfully the commissioning and performance verification phase. The in-orbit performance of the receivers matches the pre-launch sensitivities. We also report on the in-orbit performance of the receivers and some first results of HIFI's operations. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

Place, publisher, year, edition, pages
2010. Vol. 518, L6- p.
Keyword [en]
instrumentation: spectrographs, methods: observational, infrared: general, submillimeter: general, techniques: spectroscopic
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-51509DOI: 10.1051/0004-6361/201014698OAI: diva2:384613
Available from: 2011-01-10 Created: 2011-01-10 Last updated: 2011-01-10Bibliographically approved

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