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| ATCA (Australia Telescope Compact Array) | |
|---|---|
| Name | Australia Telescope Compact Array |
| Caption | Array of antennas at Narrabri |
| Location | New South Wales, Australia |
| Altitude | 260 m |
| Established | 1988 |
| Operator | Commonwealth Scientific and Industrial Research Organisation |
| Wavelength | Radio |
| Antennas | 6 × 22 m |
ATCA (Australia Telescope Compact Array) is a radio interferometer located near Narrabri, New South Wales, operated by the Commonwealth Scientific and Industrial Research Organisation. The array provides aperture synthesis imaging across centimetre wavelengths and serves the Australian astronomy community, international consortia, and multiwavelength projects linking facilities such as the Very Large Array, Parkes Observatory, and ALMA.
The facility consists of six 22-metre antennas configured along a 3-kilometre railway track near Narrabri, New South Wales, enabling baselines up to 6 kilometres with movable pads. ATCA operates in coordination with institutions including the Commonwealth Scientific and Industrial Research Organisation, the Australia Telescope National Facility, the University of Sydney, the University of New South Wales, and international partners such as the National Radio Astronomy Observatory, the Max Planck Society, and the European Southern Observatory. The array supports projects tied to missions and observatories like Hubble Space Telescope, Chandra X-ray Observatory, XMM-Newton, Fermi Gamma-ray Space Telescope, Spitzer Space Telescope, James Webb Space Telescope, Keck Observatory, and the Subaru Telescope for multiwavelength synergy.
ATCA was conceived during planning by Australian radio astronomers collaborating with groups from the University of Melbourne, Australian National University, and the CSIRO Division of Radiophysics in the 1970s and 1980s. Construction in the mid-1980s followed technological advances pioneered at the Molonglo Observatory Synthesis Telescope, the Parkes 64-metre radio telescope, and international arrays like the Very Large Array and Westerbork Synthesis Radio Telescope. Key figures in its development included scientists affiliated with the Curtin University of Technology, the University of Adelaide, and research programs funded by the Australian Research Council. Upgrades through the 1990s and 2000s integrated digital correlators inspired by work at the Jodrell Bank Observatory and receivers influenced by designs from CSIRO Astronomy and Space Science collaborators in the Max Planck Institute for Radio Astronomy and NRAO laboratories.
The site comprises six 22-metre Cassegrain antennas with surface accuracy suitable for observations at centimetre wavelengths. Antenna mounts and drives share heritage with mechanical designs evaluated at CSIRO Radiophysics Laboratory facilities and incorporate servo systems akin to those used at Parkes Observatory and Mount Pleasant Radio Observatory. The array employs a wideband correlator system built on digital signal processing concepts from projects at Jodrell Bank, NRAO, and the CSIRO Electronics and Signal Processing group. Receivers cover bands centered around 1.1–3.1 GHz, 4.5–10 GHz, and higher-frequency 16–25 GHz systems, drawing on low-noise amplifier technology developed in partnership with laboratories at the University of Tasmania, Macquarie University, and Swinburne University of Technology. Ancillary infrastructure includes calibration systems tested against standards from International Telecommunication Union recommendations and timekeeping tied to standards at the Bureau International des Poids et Mesures via national metrology institutes.
ATCA supports continuum imaging, spectral-line mapping, polarization studies, very long baseline interferometry (VLBI) phasing, and pulsar gating modes. The correlator permits flexible channelization for spectral-line projects such as studies of neutral hydrogen (HI) and molecular masers, complementing surveys by the HI Parkes All Sky Survey and follow-up of sources from the Two Micron All Sky Survey. The array can operate in tied-array mode to participate in VLBI networks with partners like the Long Baseline Array, the European VLBI Network, and VERA. Instrumentation upgrades have incorporated backend designs influenced by the Square Kilometre Array pathfinder programs, ASKAP, and digital backends trialed at the Murchison Radio-astronomy Observatory.
ATCA has produced high-resolution imaging and spectroscopy leading to advances in studies of active galactic nuclei, star formation, supernova remnants, and galactic magnetic fields. Key contributions include detailed imaging of jets in sources associated with Centaurus A, spectral-line mapping of nearby galaxies including NGC 253 and M82, polarimetric studies of the Magellanic Clouds, and measurements of HI in systems such as NGC 1365 and NGC 6946. The array provided crucial follow-up for transient sources detected by the Fermi Gamma-ray Space Telescope and Swift Observatory, and has been used in campaigns with the Australian Square Kilometre Array Pathfinder and ALMA for multi-band studies of protostellar disks around objects like TW Hydrae and HL Tauri. ATCA observations contributed to investigations of maser sources in star-forming regions such as W49 and Orion KL, pulsar wind nebulae including Crab Nebula, and HI absorption studies toward PKS 1830-211.
The array is managed by the CSIRO through the Australia Telescope National Facility with oversight from scientific advisory panels including representatives from the Australian Research Council, multiple Australian universities, and international stakeholders. Operations scheduling balances open-access time allocation committees, legacy projects supported by the National Science Foundation-style peer review, and director’s discretionary time for targets of opportunity like gamma-ray bursts localized by Neil Gehrels Swift Observatory. Technical maintenance and upgrade programs coordinate with engineering groups at CSIRO Marsfield Laboratories and collaborate with international instrument teams from the Max Planck Institute for Radio Astronomy and NRAO.
Observing time is allocated via competitive proposals reviewed by panels representing institutions such as the Australian Research Council, the European Southern Observatory, and partner universities. Data products are archived in the ATNF archive and made available to users alongside pipelines and software tools developed in cooperation with teams behind CASA, MIRIAD, AIPS, and analysis groups at the University of Sydney, Swinburne University of Technology, and the International Centre for Radio Astronomy Research. User support includes proposal assistance, data reduction workshops affiliated with the International Astronomical Union conferences, and collaborations with large surveys like the EMU project and the Sloan Digital Sky Survey follow-ups.
Category:Radio telescopes in Australia Category:Interferometers Category:Commonwealth Scientific and Industrial Research Organisation