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We have determined interstellar extinction law toward the Galactic center(GC) at the wavelength from 1.2 to 8.0 micron, using point sources detected inthe IRSF/SIRIUS near-infrared survey and those in the 2MASS andSpitzer/IRAC/GLIMPSE II catalogs. The central region |l| < 3deg and |b| < 1deghas been surveyed in the J, H and Ks bands with the IRSF telescope and theSIRIUS camera whose filters are similar to the Mauna Kea Observatories (MKO)near-infrared photometric system. Combined with the GLIMPSE II point sourcecatalog, we made Ks versus (Ks - lambda) color-magnitude diagrams where lambda= 3.6, 4.5, 5.8, and 8.0 micron. The Ks magnitudes of bulge red clump stars andthe (Ks - lambda) colors of red giant branches are used as a tracer of thereddening vector in the color-magnitude diagrams. From these magnitudes andcolors, we have obtained the ratios of total to selective extinctionA(Ks)/E(Ks-lambda) for the four IRAC bands. Combined with A(lambda)/A(Ks) forthe J and H bands derived by Nishiyama et al., we obtainA(J):A(H):A(Ks):A([3.6]):A([4.5]):A([5.8]):A([8.0])=3.02:1.73:1:0.50:0.39:0.36:0.43for the line of sight toward the GC. This confirms the flattening of theextinction curve at lambda > 3 micron from a simple extrapolation of thepower-law extinction at shorter wavelengths, in accordance with recent studies.The extinction law in the 2MASS JHKs bands has also been calculated, and a goodagreement with that in the MKO system is found. In nearby molecular clouds anddiffuse interstellar medium, the lack of reliable measurements of the total toselective extinction ratios hampers unambiguous determination of the extinctionlaw; however, observational results toward these lines of sight cannot bereconciled with a single extinction law.

astrophysical journal/the astrophysical journal

Interstellar Extinction Law toward the Galactic Center III: J, H, Ks  bands in the 2MASS and the MKO systems, and 3.6, 4.5, 5.8, 8.0 micron in the  Spitzer/IRAC system