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| 2MASS Collaboration | |
|---|---|
| Name | 2MASS Collaboration |
| Type | Astronomical survey |
| Wavelength | Near-infrared (J, H, Ks) |
| Start | 1997 |
| Completion | 2001 |
| Telescopes | Two 1.3 m telescopes |
| Lead | University of Massachusetts Amherst, IPAC/Caltech |
| Products | Point Source Catalog, Extended Source Catalog, Atlas Images |
2MASS Collaboration The 2MASS Collaboration conducted an all-sky near-infrared survey that mapped the entire celestial sphere at J, H, and Ks bands. It produced uniform, calibrated catalogs and image atlases used across astronomy, astrophysics, cosmology, and planetary science. The project was led by institutions including University of Massachusetts Amherst and Infrared Processing and Analysis Center, and it operated twin 1.3-meter telescopes at Mount Hopkins and Cerro Tololo Inter-American Observatory.
2MASS was conceived amid programs such as COBE, IRAS, IRTF, and ISO to extend infrared coverage and complement surveys like Sloan Digital Sky Survey, Palomar Observatory Sky Survey, and Digitized Sky Survey. Objectives included producing a complete near-infrared point source catalog comparable to Tycho-2 and Hipparcos for cool stars, brown dwarfs, and Galactic structure studies, as well as an extended source catalog for galaxies studied by Hubble Space Telescope, Spitzer Space Telescope, James Webb Space Telescope, and ground-based observatories. The collaboration sought to enable research on objects ranging from Mira variables and RR Lyrae to Active Galactic Nuclei, Quasars, and Large Magellanic Cloud structures, supporting follow-up with facilities like Keck Observatory, Very Large Telescope, and Atacama Large Millimeter Array.
The survey used twin custom cameras mounted on 1.3 m telescopes at Fred Lawrence Whipple Observatory and Cerro Tololo Inter-American Observatory modeled after detectors developed at University of Arizona and California Institute of Technology. Each camera employed HgCdTe arrays and dichroic filters to obtain simultaneous J, H, Ks exposures, integrating strategies informed by instruments such as 2MASS Prototype and guided by calibration plans referencing Mount Wilson Observatory and Las Campanas Observatory standards. Pointing and scheduling systems interfaced with catalogs including Guide Star Catalog and USNO for astrometric tie-ins, while photometric calibration used standards from Persson's standard stars and tie-ins to CIT photometric system and Johnson photometric system.
Raw data reduction pipelines were implemented at Infrared Processing and Analysis Center, adopting algorithms previously developed at Jet Propulsion Laboratory and techniques analogous to those used by ROSAT and GALEX. Steps included dark subtraction, flat-fielding, sky subtraction, astrometry referenced to Hipparcos and Tycho-2, and photometric calibration tied to Two Micron All Sky Survey internal standards. The project delivered the Point Source Catalog and the Extended Source Catalog, plus an image Atlas, widely cross-matched with catalogs such as SDSS, 2dF Galaxy Redshift Survey, 6dF Galaxy Survey, IRAS Point Source Catalog, and NRAO VLA Sky Survey. Data distribution channels included archives at NASA/IPAC, mirror sites at Centre de Données astronomiques de Strasbourg, and national data centers like European Southern Observatory and National Optical Astronomy Observatory.
2MASS enabled discoveries across stellar, Galactic, and extragalactic astronomy: identification of nearby cool dwarfs and brown dwarfs in concert with studies by Gliese Catalogue and follow-up at Palomar Observatory, census of the Galactic plane obscured by Milky Way dust complementing results from COBE/DIRBE, mapping of the Large Magellanic Cloud and Small Magellanic Cloud, and improved star counts for models like those of Bahcall and Robin. It revealed low-surface-brightness galaxies and new galaxy clusters later studied via ROSAT, Chandra X-ray Observatory, and XMM-Newton, and contributed to measurements of the large-scale structure alongside 2dFGRS and SDSS power spectra. 2MASS data supported identification of T Tauri stars, Brown dwarfs such as early L dwarfs and T dwarfs, and provided targets for spectroscopy at Keck Observatory and Gemini Observatory. Cross-correlation with IRAS and WISE enhanced studies of Star-forming regions including Orion Nebula, Taurus Molecular Cloud, and Perseus Molecular Cloud; 2MASS colors aided AGN selection used in Sloan Digital Sky Survey quasar catalogs and in surveys by FIRST and NVSS.
The collaboration was multinational and inter-institutional, with leadership from University of Massachusetts Amherst and California Institute of Technology's Infrared Processing and Analysis Center. Key partners included University of Arizona, Smithsonian Astrophysical Observatory, Jet Propulsion Laboratory, National Optical Astronomy Observatory, NOAO, European Southern Observatory, Space Telescope Science Institute, Harvard University, Princeton University, Massachusetts Institute of Technology, University of Chicago, Carnegie Institution for Science, Yale University, University of California, Berkeley, University of Hawaii, University of Leiden, Max Planck Institute for Astronomy, Observatoire de Paris, Centre National de la Recherche Scientifique, Australian National University, and national observatories such as Cerro Tololo Inter-American Observatory and Fred Lawrence Whipple Observatory. Governance featured technical working groups, science working groups covering topics like stellar populations and cosmology, and data release committees drawing on experience from 2dFGRS and SDSS.
2MASS legacy persists in catalogs and archives that underpin research at Hubble Space Telescope, Spitzer Space Telescope, James Webb Space Telescope, and surveys like WISE, UKIDSS, VISTA, and Pan-STARRS. Its methodology influenced pipeline development at Gaia, LSST/Vera C. Rubin Observatory, and archival practices at NASA/IPAC. The survey's all-sky infrared baseline continues to support multiwavelength cross-matching with ROSAT, GALEX, Fermi Gamma-ray Space Telescope, and radio surveys, and has been cited in thousands of studies employing databases such as ADS and services like Simbad and VizieR. The collaboration set standards for large astronomical consortia analogous to frameworks used by Sloan Digital Sky Survey and informed policy at institutions like National Science Foundation and NASA on data sharing and survey design.
Category:Astronomical surveys