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We provide new, high-resolution A(Ks) extinction maps of the heavily reddenedGalactic midplane based on the Rayleigh-Jeans Color Excess ("RJCE") method.RJCE determines star-by-star reddening based on a combination of near- andmid-infrared photometry. The new RJCE-generated maps have 2 x 2 arcmin pixelsand span some of the most severely extinguished regions of the Galaxy -- thosecovered with Spitzer+IRAC imaging by the GLIMPSE-I, -II, -3D, and Vela-Carinasurveys, from 256<l<65 deg and, in general, for |b| <= 1-1.5 deg (extending upto |b|<=4 deg in the bulge). Using RJCE extinction measurements, we generatedereddened color-magnitude diagrams and, in turn, create maps based on mainsequence, red clump, and red giant star tracers, each probing differentdistances and thereby providing coarse three-dimensional information on therelative placement of dust cloud structures. The maps generated from red giantstars, which reach to ~18-20 kpc, probe beyond most of the Milky Way extinctionin most directions and provide close to a "total Galactic extinction" map -- atminimum they provide high angular resolution maps of lower limits on A(Ks).Because these maps are generated directly from measurements of reddening by thevery dust being mapped, rather than inferred on the basis of some less directmeans, they are likely the most accurate to date for charting in detail thehighly patchy differential extinction in the Galactic midplane. We providedownloadable FITS files and an IDL tool for retrieving extinction values forany line of sight within our mapped regions.

the astrophysical journal. supplement series/astrophysical journal. supplement series

Lifting the Dusty Veil With Near- and Mid-Infrared Photometry: III.  Two-Dimensional Extinction Maps of the Galactic Midplane Using the  Rayleigh-Jeans Color Excess Method