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| Leiden/Argentine/Bonn (LAB) Survey | |
|---|---|
| Name | Leiden/Argentine/Bonn (LAB) Survey |
| Type | Astronomical survey |
| Subject | Neutral hydrogen (HI) |
| Institutions | Leiden Observatory; Instituto Argentino de Radioastronomía; Max Planck Institute for Radio Astronomy |
| Start | 2005 |
| Wavelength | 21 cm |
| Status | Completed |
Leiden/Argentine/Bonn (LAB) Survey
The Leiden/Argentine/Bonn (LAB) Survey is an all-sky 21-centimetre neutral hydrogen (HI) survey combining data from multiple observatories to deliver a uniform database for Galactic and extragalactic research. The survey merged observations and calibration efforts across European and South American institutions to produce a spectrally resolved cube used by researchers studying the Milky Way, high-velocity clouds, and the interstellar medium.
The survey resulted from collaborations among Leiden Observatory, Instituto Argentino de Radioastronomía, and the Max Planck Institute for Radio Astronomy, drawing on legacy datasets originally obtained with the Leiden/Dwingeloo Survey, the Instituto Argentino de Radioastronomía Survey, and the Bonn 25-m radio telescope campaign. It was motivated by needs articulated at meetings attended by scientists from University of Bonn, European Southern Observatory, Cerro Tololo Inter-American Observatory, and users from the Harvard-Smithsonian Center for Astrophysics and the National Radio Astronomy Observatory community. The product serves projects tied to the Planck mission, the Fermi Gamma-ray Space Telescope, and surveys by the Sloan Digital Sky Survey team.
Observations incorporated data from the Leiden/Dwingeloo Survey collected at the Dwingeloo Radio Observatory and pointed mapping from the Villa Elisa Radio Telescope in Argentina, augmented by scans with the Bonn 25-m radio telescope operated by the Max Planck Institute for Radio Astronomy. The design adopted a spectral resolution and velocity coverage compatible with studies by groups at the University of Groningen, University of Buenos Aires, University of Cologne, and collaborators who had worked with instruments linked to the European VLBI Network and the Very Large Array. Sky coverage targeted declinations accessible to the combined arrays, coordinating through staff with ties to the Royal Netherlands Academy of Arts and Sciences and the Argentine National Scientific and Technical Research Council. Pointing strategies, beam models, and sampling choices were influenced by prior surveys such as those undertaken by researchers at the Jodrell Bank Observatory, the Arecibo Observatory, and the Parkes Observatory.
Calibration steps brought expertise from teams associated with Leiden Observatory, Instituto Argentino de Radioastronomía, and the Max Planck Institute for Radio Astronomy, and they applied methods used by groups at the European Southern Observatory and the Centre National de la Recherche Scientifique. Baseline fitting, stray radiation correction, and flux calibration referenced techniques developed in analyses by scientists at the California Institute of Technology, Massachusetts Institute of Technology, University of Cambridge, and the University of Manchester. Processing pipelines addressed instrumental signatures similar to those encountered in work by the NRAO staff, and quality assurance drew on standards familiar to personnel from the Smithsonian Astrophysical Observatory and the Royal Astronomical Society.
Final data products included all-sky HI spectra, column density maps, and spectral cubes distributed to users at institutions like the Max Planck Institute for Astrophysics, University of Chicago, Columbia University, and research consortia that supported the Planck and Fermi teams. Data access was facilitated for investigators at the European Space Agency, NASA, CNRS, and national observatories such as the National Astronomical Observatory of Japan and the Australian National University. The archive supported cross-comparison with catalogs from the Sloan Digital Sky Survey, the Two Micron All Sky Survey, and gamma-ray studies by the Fermi Gamma-ray Space Telescope consortium.
Researchers used the survey to map Galactic HI structure in projects led by scientists from Leiden Observatory, MPI for Radio Astronomy, Instituto Argentino de Radioastronomía, and teams collaborating with the Max Planck Society, enabling studies of the Perseus Arm, the Orion Arm (Milky Way), and features linked to the Magellanic Stream. The data underpinned investigations of high-velocity clouds examined by researchers at the Johns Hopkins University, University of Wisconsin–Madison, and the Harvard & Smithsonian, and informed absorption studies by groups at the University of Toronto and University of Maryland. Applications extended to cosmic-ray and gamma-ray modeling used by the Fermi collaboration, dust-HI correlation studies with the Planck team, and foreground removal for cosmic microwave background analyses pursued by the European Space Agency and NASA scientists.
Users note limitations discussed in community meetings attended by representatives of the International Astronomical Union, Royal Society, and national academies, including angular resolution constrained by the original telescopes at Dwingeloo Radio Observatory and Bonn 25-m radio telescope, stray radiation residuals recognized by analysts at the Max Planck Institute for Radio Astronomy and Leiden Observatory, and velocity resolution bounds relevant to studies by the NRAO and CSIRO. Systematic uncertainties impact comparisons with interferometric datasets from the Very Large Array and single-dish maps from the Parkes Observatory, requiring joint analyses with teams at the Commonwealth Scientific and Industrial Research Organisation and universities involved in HI synthesis imaging.
The survey left a legacy cited by publications from institutions such as Leiden Observatory, Max Planck Institute for Radio Astronomy, Harvard-Smithsonian Center for Astrophysics, and the European Space Agency, influencing subsequent surveys like those conducted with the Australian Square Kilometre Array Pathfinder, the MeerKAT array, and planning for the Square Kilometre Array. It continues to be a reference dataset for studies by the Planck collaboration, the Fermi consortium, and multidisciplinary teams at the University of Cambridge, Princeton University, and Caltech, underpinning work on Galactic structure, interstellar medium physics, and multiwavelength astrophysics.
Category:Radio astronomy surveys