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Saturday, August 6, 2011

Entire Near-Infrared Sky

Entire Near-Infrared Sky

Figure 1. Panoramic view of the entire near-infrared sky reveals the distribution of galaxies beyond the Milky Way. The image is derived from the 2MASS Extended Source Catalog (XSC)--more than 1.5 million galaxies, and the Point Source Catalog (PSC)--nearly 0.5 billion Milky Way stars. The galaxies are color coded by "redshift" obtained from theUGC, CfA, Tully NBGC, LCRS, 2dF, 6dFGS, and SDSS surveys (and from various observations compiled by the NASA Extragalactic Database), or photo-metrically deduced from the K band (2.2 um). Blue are the nearest sources (z < 0.01); green are at moderate distances (0.01 < z < 0.04) and red are the most distant sources that 2MASS resolves (0.04 < z < 0.1). The map is projected with an equal area Aitoff in the Galactic system (Milky Way at center). A locator chart is provided here. An animation that shows the cosmic web separated by sliced redshift is given here-animation (beware: this is 19MB in size). Jarrett, T.H. 2004, PASA, 21, 396.
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