The Two Micron All Sky Survey
نویسندگان
چکیده
منابع مشابه
The Two Micron All-Sky Survey: Removing the Infrared Foreground
We introduce the properties of the Two Micron All-Sky Survey (2MASS) survey for IAU Symposium 204. 2MASS is a near-infrared survey of the entire sky characterized by high reliability and completeness. Catalogs and images for 47% of the sky are now available online. This data release has been used by Wright (2000) and Cambrésy et al. (2000) to subtract the stellar foreground at 1.25 and 2.2 micr...
متن کاملTwo nearby M dwarf binaries from the Two Micron All Sky Survey
We report the discovery of two binary M dwarf systems in the immediate solar neighbourhood using the Two Micron All Sky Survey (2MASS). The first is an M6.5 companion to the nearby G star HD 86728 (Gl 376). The known properties of HD 86728 indicate that the M dwarf (Gl 376B) is old, metal-rich and only 14.9 parsec away. The M dwarf is highly active, with both Ha and X-ray emission. Thus, Gl 376...
متن کاملOptical Spectropolarimetry of Quasi-stellar Objects Discovered by the Two-micron All Sky Survey
Highly polarized QSOs discovered in the Two-Micron All Sky Survey (2MASS) have been observed to determine the source(s) of optical polarization in this near-infrared color-selected sample. Broad emission lines are observed in the polarized flux spectra of most objects, and the polarization of the lines is at about the same level and position angle as the continuum. Generally, the continuum is b...
متن کاملAn Unbiassed Census of Active Galactic Nuclei in the Two Micron All Sky Survey
We present an unbiassed near-IR selected AGN sample, covering 12.56 square degrees down to Ks ∼ 15.5, selected from the Two Micron All Sky Survey (2MASS). Our only selection effect is a moderate color cut (J − Ks > 1.2) designed to reduce contamination from galactic stars. We observed both point-like and extended sources. Using the brute-force capabilities of the 2dF multi-fiber spectrograph on...
متن کاملDiscovery of Four Field Methane (T-type) Dwarfs with the Two Micron All-Sky Survey
We report the discovery of four field methane (“T”-type) brown dwarfs using Two Micron All-Sky Survey (2MASS) data. One additional methane dwarf, previously discovered by the Sloan Digital Sky Survey, was also identified. Near-infrared spectra clearly show the 1.6 and 2.2 μm CH4 absorption bands characteristic of objects with Teff∼< 1300 K, as well as broadened H2O bands at 1.4 and 1.9 μm. Comp...
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ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 1994
ISSN: 0004-640X,1572-946X
DOI: 10.1007/bf00990014