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| CARMA | |
|---|---|
| Name | CARMA |
| Location | Owens Valley Radio Observatory, near Big Pine, California |
| Established | 2005 |
| Closed | 2015 |
| Telescopes | 23 radio antennas (6×10.4 m, 9×6.1 m, 8×3.5 m) |
| Wavelength | millimeter (1 mm–3 mm) |
| Operator | California Institute of Technology, University of California, Berkeley, University of Illinois Urbana–Champaign, Yale University, University of Chicago, University of Maryland |
CARMA was a former millimeter-wave radio telescope array that combined antennas and expertise from multiple North American institutions to perform high-resolution interferometric imaging. Located at the Owens Valley Radio Observatory near Big Pine, California, CARMA operated in the 2005–2015 decade and contributed to studies of star formation, protoplanetary disks, molecular clouds, and active galactic nuclei. The array's hybrid configuration and broad institutional collaboration made it an important transitional facility between single-dish and next-generation interferometers.
CARMA assembled antennas from the Berkeley-Illinois-Maryland Association legacy, the Caltech Owens Valley array, and the Sunyaev–Zel'dovich Array hardware, producing a heterogeneous aperture synthesis instrument. The array observed at millimeter wavelengths used for tracing molecules such as carbon monoxide and dust continuum emission in regions like the Orion Nebula, Taurus Molecular Cloud, and around protostars in Perseus. CARMA's capabilities complemented facilities such as the Atacama Large Millimeter/submillimeter Array, the Submillimeter Array, and the Nobeyama Radio Observatory by providing intermediate baselines and flexible configurations for interferometric experiments.
CARMA emerged from proposals and mergers involving groups at California Institute of Technology, University of California, Berkeley, and the University of Illinois Urbana–Champaign, later joined by Yale University, the University of Chicago, and the University of Maryland. The project grew from work at the Owens Valley Radio Observatory and the Hat Creek Radio Observatory and benefited from technology developed for the Berkeley-Illinois-Maryland Association (BIMA) and the Sunyaev–Zel'dovich Array (SZA). Commissioning phases involved engineers and scientists affiliated with programs like the National Science Foundation and coordinated with observatories such as Kitt Peak National Observatory and Green Bank Observatory. Over its operational lifetime CARMA supported observing campaigns tied to research published in journals associated with the American Astronomical Society and collaborations with groups at the Harvard–Smithsonian Center for Astrophysics.
CARMA's heterogeneous array consisted of 23 antennas: six 10.4 m dishes originating from the Owens Valley Radio Observatory fleet, nine 6.1 m dishes from the BIMA project, and eight 3.5 m dishes from the SZA. The correlator electronics were influenced by designs used at the Very Large Array and contemporary digital backends at institutions such as the Max Planck Institute for Radio Astronomy and the National Radio Astronomy Observatory. Receivers covered 1 mm to 3 mm bands with mixers and low-noise amplifiers similar to units developed at Jet Propulsion Laboratory and the National Institute of Standards and Technology. Antenna mounts and servo systems derived from work at Northrop Grumman and antenna surfaces were maintained to tolerances comparable to those used at the Submillimeter Telescope (Arizona) and the IRAM 30m telescope. The array's baseline configurations ranged from compact setups suitable for diffuse emission studies to extended arrays enabling high angular resolution comparable to early results from ALMA commissioning.
Observing time on CARMA was allocated through proposals submitted by investigators at partner institutions and the wider community, with scheduling coordinated alongside facilities like the Keck Observatory and Palomar Observatory for multiwavelength campaigns. The observatory provided user support for configuration planning, data calibration, and imaging, integrating software tools influenced by packages from the Astronomical Image Processing System and development teams at the Smithsonian Astrophysical Observatory. CARMA participated in target-of-opportunity programs for transient sources including follow-up of events reported by Fermi Gamma-ray Space Telescope, Swift, and ground-based facilities such as the Palomar Transient Factory. Data products contributed to archives maintained by partner institutions and were used in time-domain, spectral-line, and continuum studies.
CARMA produced important measurements of molecular gas kinematics and dust structure in regions like HL Tauri, L1551 IRS5, and young stellar objects in the Ophiuchus constellation. The array mapped CO isotopologues in protoplanetary disks to constrain disk masses in studies referenced alongside work at Spitzer Space Telescope and Hubble Space Telescope. CARMA delivered observations of the Sunyaev–Zel'dovich effect in galaxy clusters such as Abell 1689 and contributed to constraints on intracluster medium pressure profiles used in cosmological analyses with the Planck mission and the South Pole Telescope. Surveys of the Perseus Cluster and investigations into bipolar outflows tied to sources like HH 211 were notable, as were measurements of dense gas tracers (e.g., HCO+, N2H+) in molecular clouds studied also by teams at Max Planck Institute for Astronomy and the Jet Propulsion Laboratory. CARMA's imaging of magnetic field structures via polarization supported comparisons with results from the Caltech Submillimeter Observatory and the James Clerk Maxwell Telescope.
CARMA was a consortium effort integrating resources and personnel from California Institute of Technology, University of California, Berkeley, University of Illinois Urbana–Champaign, Yale University, University of Chicago, and University of Maryland. The project engaged with national and international entities including the National Science Foundation, the National Radio Astronomy Observatory, and research groups at Harvard University, Princeton University, Massachusetts Institute of Technology, University of Arizona, University of Colorado Boulder, and University of Toronto. Collaborative science workshops and summer schools involved scientists from institutions such as Stanford University, Cornell University, Rutgers University, University of Michigan, Columbia University, and University of Cambridge.
CARMA ceased scientific operations in 2015 as its partners reallocated resources toward newer facilities like ALMA and upgrades at partner observatories. Equipment and lessons learned fed into projects at the National Radio Astronomy Observatory and academic programs at Caltech and UC Berkeley, influencing instrument design and training for students who later worked on arrays including Next Generation Very Large Array concepts, the Submillimeter Array, and community software efforts tied to the AstroPy Project. Sites and hardware were repurposed or returned to member institutions; CARMA's legacy persists in archival data used in ongoing research and in the professional development of astronomers now at centers such as the Harvard–Smithsonian Center for Astrophysics, Max Planck Institute for Radio Astronomy, and national observatories worldwide.
Category:Radio telescopes Category:Interferometry Category:California Institute of Technology