In a series of papers, we have applied an optimized multi-band technique dubbed Near-Infrared Color Excess Revisited ( Nicer Lombardi & Alves 2001, hereafter Paper 0) to measure dust extinction and investigate the structure of nearby molecular dark clouds using the Two Micron All Sky Survey (2MASS Kleinmann et al. Key words: ISM: clouds / ISM: structure / dust, extinction / methods: statistical We measured the cloud distances by comparing the observed density of foreground stars with the prediction of galactic models, thus obtaining d OrionA = (371 ± 10) pc, d OrionB = (398 ± 12) pc, d MonR2 = (905 ± 37) pc, d Rosette = (1330 ± 48) pc, and d CMa = (1150 ± 64) pc, values that compare very well with independent estimates. Over the relevant regions of the field, we reached a 1- σ error of 0.03 mag in the K-band extinction with a resolution of 3arcmin. We used robust and optimal methods to map the dust column density in the near-infrared ( Nicer and Nicest) towards ~19 million stars of the Two Micron All Sky Survey (2MASS) point source catalog. We present a near-infrared extinction map of a large region (approximately 2200 deg 2) covering the Orion, the Monoceros R2, the Rosette, and the Canis Major molecular clouds.
Harvard-Smithsonian Center for Astrophysics, Mail Stop 72, 60 Garden Street, Cambridge, MA 02138, USA University of Milan, Department of Physics, via Celoria 16, 20133 Milan, ItalyĮ-mail: of Vienna, TürkenschanzstraVienna, Austria
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