A Deep Near Infrared Imaging Survey of the Lupus 3 Dark Cloud

Computer Science

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Scientific paper

We present the first report on results of near-infrared imaging survey of the Lupus 3 dark cloud. The survey covers 7' x 11', which corresponds to a projected area of 0.35 pc x 0.55 pc at a distance of 150 pc. Mapping was carried out at J, H, and Ks, to 10σ limiting magnitudes of J=17.0, H=16.5, and Ks=15.5. A total of 229 sources brighter than Ks < 15.8 were detected at all bands with a 90% completeness limit. Source classification is performed based on the near-infrared colors. Ten sources are candidates of Lada's class II pre-main-sequence (PMS) stars, as they show a color excess. We also identified 11 class I-like candidates have a large color-excess, H-Ks >= 2. There are 3 sub-clusters in this survey area of which two are embedded and mainly consist of the class I-like candidates. We estimate masses of the class II candidates with an aid of an evolutionary model of PMS stars. Ten out of them have masses less than 0.08 Modot, if we assume their age to be 106 yr. Hence we consider them as candidates of young brown dwarfs.

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