Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-24
Astronomy and Astrophysics
Astrophysics
39 pages, 9 postscript figures, accepted for publication in AJ
Scientific paper
10.1086/346277
We conducted deep NIR imaging observations of the Orion molecular cloud 2 and 3 using QUIRC on the 88-inch telescope of the University of Hawaii. Our purposes are 1) to generate a comprehensive NIR source catalog of these star forming clouds, and 2) to identify the NIR counterpart of the Chandra X-ray sources that have no counterpart in the 2MASS catalog. Our J-, H-, and K-band observations are about 2 mag deeper than those of 2MASS, and well match the current Chandra observation. We detected 1448 NIR sources, for which we derived the position, the J-, H-, and K-band magnitude, and the 2MASS counterpart. Using this catalog, we identified the NIR counterpart for about 42% of the 2MASS-unIDed Chandra sources. The nature of these Chandra sources are discussed using their NIR colors and spatial distributions, and a dozen protostar and brown dwarf candidates are identified.
Goto Mario
Kobayashi Nami
Koyama Katsuji
Tokunaga Alan T.
Tsuboi Yohko
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