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| HARMONI instrument | |
|---|---|
| Name | HARMONI |
| Type | Integral Field Spectrograph |
| Telescope | Extremely Large Telescope |
| Organization | European Southern Observatory |
| Wavelength | Visible and Near-infrared |
| Resolution | R~3500 (typical), up to R~20000 |
| First light | Planned 2020s |
HARMONI instrument HARMONI is a first-light integral field spectrograph developed for the Extremely Large Telescope by the European Southern Observatory and partners, designed to deliver spatially resolved spectroscopy across visible and near-infrared bands for studies ranging from nearby Solar System bodies to high-redshift Galaxy formation and Cosmology. The project brings together institutions such as the Oxford University, Leiden University, Max Planck Society, and industrial contractors like Thales Alenia Space and Airbus Defence and Space to integrate adaptive optics, cryogenic optics, and advanced detectors at the Paranal Observatory-class site that will host the ELT.
HARMONI serves as a workhorse spectrograph on the Extremely Large Telescope and is intended to operate alongside instruments such as MICADO and METIS, providing medium- and high-angular-resolution integral field spectroscopy to probe phenomena including Star formation, Active Galactic Nuclei, and stellar populations in nearby Andromeda and other Local Group galaxies. The instrument architecture supports multiple spatial scales and spectral resolutions to accommodate science cases from resolved kinematics in M87 to chemical abundance studies in NGC 6822, leveraging synergies with facilities like the James Webb Space Telescope, Atacama Large Millimeter/submillimeter Array, and future Nancy Grace Roman Space Telescope programs.
HARMONI is designed as a cryogenic, refractive-reflective optical train feeding an integral field unit (IFU) with selectable spaxel scales and wavelength coverage spanning the visible to near-infrared, building on heritage from instruments such as SINFONI, MUSE, and OSIRIS (Keck) while incorporating lessons from projects like KMOS and NACO. The design includes selectable gratings and image slicers to deliver resolving powers from R~3500 to R~20000 across bands comparable to I-band, J-band, H-band, and K-band. Key technical partners include the Centre National de la Recherche Scientifique, INAF, and UK institutions that provided optical design, detector procurement (e.g., Teledyne Imaging Sensors), and cryogenic engineering inspired by work at Institut d'Astrophysique de Paris and Durham University.
HARMONI's science program targets a broad range of priorities identified in the European Southern Observatory science roadmap and community white papers, including tracing early galaxy assembly at high redshift in synergy with Planck cosmological constraints, measuring black hole masses in nearby Seyfert nuclei, resolving stellar populations in Local Group dwarfs like Fornax and Sculptor, and characterizing exoplanet atmospheres akin to studies carried out by WASP-12b and HR 8799. The instrument will enable dynamical studies of mergers such as analogs to the Antennae Galaxies, chemical tagging comparable to surveys like GALAH, and circumstellar disk mapping similar to investigations of HL Tauri.
Major subsystems include an adaptive optics interface compatible with the ELT's multi-conjugate and single-conjugate systems developed with teams from European Southern Observatory and partners, an IFU with multiple slicer modules influenced by designs from SPIFFI and SINFONI, cryostat and thermal control systems engineered with input from Thales Alenia Space and Airbus Defence and Space, and detector benches using Hawaii-2RG or successor arrays from Teledyne Imaging Sensors. The instrument control electronics and software draw on frameworks used in VLT instrumentation projects, and data handling pipelines are coordinated with archives like the ESO Science Archive Facility and community tools including Astropy, IRAF-heritage modules, and pipelines developed at Leiden Observatory and Oxford Astrophysics.
Calibration strategies employ internal lamps, sky frames, and on-sky calibrators such as NGC 7027 and planetary nebulae used historically by ESO instruments to characterize spectral line spread functions, throughput, and telluric correction. Data reduction pipelines will provide cube reconstruction, spectral extraction, and variance propagation following best practices established by MUSE and SINFONI teams, integrating algorithms from groups at Max Planck Institute for Astronomy and University of Cambridge. Predicted on-sky performance projections, based on adaptive optics error budgets tied to the ELT design, indicate HARMONI will achieve near-diffraction-limited sampling at shorter wavelengths under good seeing, with limiting magnitudes and signal-to-noise ratios benchmarked against surveys like DEEP2 and follow-up programs planned with GAIA sources.
Commissioning phases are scheduled to follow ELT first light, coordinated with observatory integration teams and instrument consortia from institutions including Leiden University, Oxford University, INAF, and the Max Planck Society. Early science verification will target well-studied objects such as NGC 1068, NGC 253, and standard spectrophotometric stars used by ESO for cross-calibration, with performance validation contrasted against expectations from the ELT systems engineering models. Operational modes will be delivered to the community via calls for proposals through the European Southern Observatory time allocation process and supported by pipeline releases and instrument manuals produced by the consortium.
Planned developments include detector upgrades leveraging advances from Teledyne and other sensor manufacturers, enhanced high-resolution gratings inspired by CRIRES+ enhancements, and potential add-ons for extended wavelength coverage coordinated with projects at INAF and the Max Planck Society. Consortium discussions consider integration of improved real-time control algorithms developed by groups at University of Cambridge and Durham University and additional calibration units influenced by techniques from JWST commissioning teams, ensuring HARMONI remains competitive for legacy surveys and follow-up campaigns with observatories like ALMA and future space missions.
Category:European Southern Observatory instruments