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| Spectral and Photometric Imaging Receiver | |
|---|---|
| Name | Spectral and Photometric Imaging Receiver |
| Acronym | SPIRE |
| Mission | Herschel Space Observatory |
| Operator | European Space Agency / NASA |
| Launch | 2009 |
| Type | Photometer and Spectrometer |
| Wavelength | Far-infrared to submillimetre |
Spectral and Photometric Imaging Receiver The Spectral and Photometric Imaging Receiver is an instrument flown on the Herschel Space Observatory that combined imaging photometry and imaging spectroscopy for far-infrared and submillimetre astronomy. Designed and built by a consortium led by the UK Astronomy Technology Centre and institutions across Europe, the instrument supported surveys of star formation regions, galaxy evolution, and cosmic microwave background foregrounds. SPIRE operated alongside instruments such as PACS and contributed to legacy datasets used by observatories including ALMA, SOFIA, and the James Webb Space Telescope.
SPIRE was conceived in the context of the Herschel payload to provide broad community access to the 194–671 μm band, enabling continuum photometry and Fourier-transform spectroscopy. The instrument consortium included the UK Science and Technology Facilities Council, Centre National d'Études Spatiales, Thales Alenia Space, and NASA, building on technologies developed for missions like COBE and Planck. SPIRE’s science goals aligned with proposals from facilities such as the Very Large Array, the Submillimeter Array, and the Institut d'Astrophysique Spatiale teams to study interstellar medium processes, protoplanetary disks, and high-redshift submillimetre galaxies.
SPIRE comprised two primary subsystems: a three-band imaging photometer and an imaging Fourier Transform Spectrometer (FTS). The photometer used feedhorn-coupled bolometer arrays cooled by a ^3He/^4He sorption cooler developed in collaboration with Rutherford Appleton Laboratory and industrial partners like EADS Astrium. Detector technologies traced lineage to programs at Cardiff University, University of Lethbridge, and Jet Propulsion Laboratory. Optical chains incorporated mirrors and dichroics designed by teams at Mullard Space Science Laboratory and Institut d'Optique, while the FTS mechanism drew heritage from spectrometers developed at NASA Goddard Space Flight Center and Max Planck Institute for Radio Astronomy. Electronics and readout systems were provided by partners including Thales Group and CEA Saclay, integrated into flight software tested with facilities at European Space Research and Technology Centre.
SPIRE operated in mapping, photometry, and spectroscopic modes with scan strategies coordinated with Herschel mission planners from European Space Agency mission operations. Photometer modes produced maps at nominal bands centered near 250 μm, 350 μm, and 500 μm for surveys proposed by teams associated with Herschel Multi-tiered Extragalactic Survey, Herschel-ATLAS, and Gould Belt Survey. The FTS delivered spectral cubes with resolving powers varying from low to medium, used by projects linked to HerMES and targeted observations of planetary nebulae, molecular clouds, and active galactic nuclei. Data products were archived and distributed through the Herschel Science Archive and analyzed by researchers at institutions such as University of Cambridge, Caltech, and Max Planck Institute for Astrophysics.
Radiometric and spectral calibration exploited observations of primary calibrators like Neptune and secondary standards characterized by teams at National Radio Astronomy Observatory and Institut d'Astrophysique de Paris. Beam profiles and spectral response functions were modeled using lab calibration campaigns at RAL Space and verified in-flight with observations of Uranus and bright asteroids used by groups at Jet Propulsion Laboratory. Performance assessments compared SPIRE sensitivity to expectations from pre-launch modeling by European Space Agency science planners and technology demonstrators at UK Astronomy Technology Centre. Stability and noise properties were quantified by cross-calibration with PACS and by joint analyses with data from Planck and ground arrays including JCMT.
SPIRE was central to major Herschel programs coordinated with international consortia including researchers from Harvard–Smithsonian Center for Astrophysics, Max Planck Society, and Sorbonne University. Applications encompassed studies of circumstellar envelopes around evolved stars investigated by teams at European Southern Observatory, surveys of dust mass and star formation rate across cosmic time used by the COSMOS team, and photometric redshift estimation for submillimetre galaxies pursued by groups at University of Edinburgh and University of Texas at Austin. SPIRE data enabled cross-mission projects linking Spitzer Space Telescope mid-infrared data and Chandra X-ray Observatory observations to build panchromatic pictures of galaxy ecosystems.
Key scientific outcomes included measurements of dust-obscured star formation history by consortia such as HerMES and H-ATLAS, detection and characterization of cold dust in nearby galaxies studied by SINGS follow-up teams, and spectral detections of water, carbon monoxide, and ionized carbon lines in star-forming regions analyzed by researchers from Max Planck Institute for Astronomy and University of Leiden. SPIRE contributed to discoveries of high-redshift dusty starbursts that were targets for ALMA spectroscopy and to constraints on dust grain properties used by theoretical groups at Princeton University and Institute of Astronomy, Cambridge.
SPIRE’s limitations included diffraction-limited resolution at submillimetre wavelengths and finite mission lifetime constrained by cryogen depletion, similar to experiences from ISO and Spitzer cryogenic phases. Future developments inspired by SPIRE include planned instruments on missions such as SPICA and proposed facilities like the Origins Space Telescope and ground arrays upgraded at ALMA and NOEMA. Technology paths emphasize transition-edge sensors and kinetic inductance detectors advanced by groups at NIST and SRON, and cryogenic cooling strategies explored at JAXA and Canadian Space Agency.