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| Bar and Spiral Structure Legacy Survey | |
|---|---|
| Name | Bar and Spiral Structure Legacy Survey |
| Mission type | Ground-based radio and infrared survey |
| Operator | National Radio Astronomy Observatory; Max Planck Institute for Astronomy |
| Duration | 2009–2015 |
| Instruments | Very Large Array; Very Large Telescope; Spitzer Space Telescope; Herschel Space Observatory |
| Wavelength | Radio; infrared; submillimetre |
| Targets | Inner Milky Way; Galactic plane; molecular clouds |
Bar and Spiral Structure Legacy Survey presents a coordinated observational program mapping the inner Milky Way with multiwavelength imaging and spectroscopy to characterize the molecular gas, star formation, and kinematics associated with the Galactic bar and spiral arms. Combining facilities such as the Very Large Array, Atacama Large Millimeter/submillimeter Array, Spitzer Space Telescope, and Herschel Space Observatory, the survey produced uniform datasets used by research groups across institutions including the National Radio Astronomy Observatory, Max Planck Institute for Astronomy, and universities like Harvard University and University of Cambridge.
The project targeted the inner few degrees of the Galactic Center and extended along the Galactic plane to sample features linked to the long bar, box/peanut bulge, and major spiral features such as the Perseus Arm, Scutum–Centaurus Arm, and Norma Arm. Coordinated observing campaigns integrated radio recombination and molecular line mapping with continuum imaging from facilities including the Green Bank Telescope, James Clerk Maxwell Telescope, IRAM 30m Telescope, and the Submillimeter Array. Principal investigators and co-investigators came from institutions like University of California, Berkeley, Princeton University, Institute for Astronomy, University of Hawaii, Leiden University, and the European Southern Observatory.
Survey design emphasized contiguous coverage, uniform sensitivity, and spectral resolution sufficient to resolve kinematic components of molecular clouds, H II regions, and maser sources. The observing strategy borrowed techniques from legacy projects such as the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire and the Boston University–Five College Radio Astronomy Observatory Galactic Ring Survey, using mosaicked mapping and on-the-fly mapping modes pioneered at the NRAO Green Bank Observatory. Sample selection integrated catalogues from the RMS Survey, CORNISH, and the Methanol Multibeam Survey, while calibration plans referenced standards established by the International Astronomical Union and cross-checked against surveys like the Infrared Astronomical Satellite and the Wide-field Infrared Survey Explorer.
Key spectral lines observed included rotational transitions of CO isotopologues, dense gas tracers such as HCN and HCO+, and maser lines like 6.7 GHz methanol and 22 GHz water, observed with arrays and single dishes including the Atacama Pathfinder Experiment, Mopra Telescope, and the Parkes Observatory. Continuum maps spanning mid-infrared to submillimetre bands employed imaging from the Spitzer Space Telescope (IRAC, MIPS), the Herschel Space Observatory (PACS, SPIRE), and ground-based facilities like the United Kingdom Infrared Telescope and the Very Large Telescope instruments VISIR and VISTA. High-resolution follow-up used interferometers such as the Very Long Baseline Array and European VLBI Network to pinpoint maser parallax distances tied into astrometric frameworks from missions like Gaia.
Data reduction pipelines adapted software packages including CASA, GILDAS, and HIPE and employed post-processing with tools developed at centers such as the Harvard-Smithsonian Center for Astrophysics and Max Planck Institute for Radio Astronomy. Products released to the community comprised calibrated spectral cubes, continuum mosaics, source catalogs for compact H II regions and infrared dark clouds, and kinematic models for molecular complexes. Ancillary catalogs cross-matched sources with archival datasets from Two Micron All Sky Survey, Sloan Digital Sky Survey, and the Chandra X-ray Observatory, and included distance estimates anchored to maser parallaxes and rotation-curve analyses used by research groups at University of Chicago and Carnegie Institution for Science.
Analyses demonstrated connections between the bar-driven gas flows and star formation in regions associated with dust lanes and shocked molecular gas, corroborating theoretical predictions from dynamical studies by teams at University of Oxford and University of Bonn. The survey identified massive proto-clusters and extreme star-forming complexes analogous to regions like W43 and W51, and refined the census of infrared dark clouds and ultra-compact H II regions catalogued by projects at University of Leeds and University of Toronto. Kinematic decompositions resolved multiple velocity components within spiral arm crossings, aiding work on Galactic structure by researchers at Cornell University and University of Arizona. Cross-disciplinary studies linked molecular gas properties to young stellar object populations identified by groups at University of Michigan and University of Edinburgh and informed simulations run at institutions such as Princeton University and Max Planck Institute for Astrophysics.
The survey's uniform datasets have been incorporated into subsequent large programs and legacy archives maintained by organizations including the NASA/IPAC Infrared Science Archive, European Space Agency, and the International Centre for Radio Astronomy Research. Its catalogs and maps underpin studies of Galactic ecology pursued at California Institute of Technology and Massachusetts Institute of Technology and feed into preparatory science for facilities like the Square Kilometre Array and next-generation instruments at the Atacama Large Millimeter/submillimeter Array. The collaborative framework promoted data sharing and training across institutions such as National Optical-Infrared Astronomy Research Laboratory, Johns Hopkins University, and Yale University, leaving a lasting impact on Galactic astronomy and the community resources used by researchers worldwide.
Category:Galactic surveys