Journal
ASTRONOMY & ASTROPHYSICS
Volume 489, Issue 1, Pages 143-156Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200810070
Keywords
ISM : clouds; ISM : dust, extinction; ISM : structure; ISM : individual objects : Pipe molecular complex; methods : data analysis
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Funding
- NASA ORIGINS [NAG 5-13041]
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We present an extinction map of a similar to 1700 deg sq region that encloses the Ophiuchus, the Lupus, and the Pipe dark complexes using 42 million stars from the Two Micron All Sky Survey (2MASS) point source catalog. The use of a robust and optimal near-infrared method to map dust column density (nicer, described in Lombardi & Alves 2001, A&A, 377, 1023) allow us to detect extinction as low as A(K) = 0.05 mag with a 2-sigma significance, and still to have a resolution of 3 arcmin on our map. We also present a novel, statistically sound method to characterize the small-scale inhomogeneities in molecular clouds. Finally, we investigate the cloud structure function, and show that significant deviations from the results predicted by turbulent models are observed.
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