Mathematics – Logic
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.1301i&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #13.01; Bulletin of the American Astronomical Society, Vol. 32, p.1422
Mathematics
Logic
Scientific paper
We positionally match sources observed by the Sloan Digital Sky Survey (SDSS) to sources observed by the Two Micron All Sky Survey (2MASS) in ~200 deg2 of high-latitude sky along the Celestial Equator. There are ~3*E6 SDSS sources and ~2*E5 2MASS sources in this region. Practically all ( ~99%) 2MASS sources are matched to an SDSS source within 1 arcsec, and ~12% of them are galaxies resolved in SDSS imaging data. Only ~25% of the optically resolved galaxies are also resolved in 2MASS data. We discuss the optical and infrared color-color and color-magnitude diagrams for the matched sources and show that stars, galaxies and quasars can be cleanly separated even without morphological information using only the optical-infrared colors. We calculate the K-band luminosity function for galaxies and find it consistent with previous work but with five times smaller error bars.
Fan Xiaohui
Finlator Kristian
Gunn James
Hall Peter
Ivezic Zeljko
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