Volume 535, November 2011
|Number of page(s)||13|
|Section||Interstellar and circumstellar matter|
|Published online||26 October 2011|
2MASS wide field extinction maps
IV. The Orion, Monoceros R2, Rosette, and Canis Major star forming regions
University of Milan, Department of Physics, via Celoria 16, 20133 Milan, Italy
2 University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
3 Harvard-Smithsonian Center for Astrophysics, Mail Stop 72, 60 Garden Street, Cambridge, MA 02138, USA
Received: 17 March 2011
Accepted: 18 July 2011
We present a near-infrared extinction map of a large region (approximately 2200 deg2) covering the Orion, the Monoceros R2, the Rosette, and the Canis Major molecular clouds. 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. 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 measured the cloud distances by comparing the observed density of foreground stars with the prediction of galactic models, thus obtaining dOrionA = (371 ± 10) pc, dOrionB = (398 ± 12) pc, dMonR2 = (905 ± 37) pc, dRosette = (1330 ± 48) pc, and dCMa = (1150 ± 64) pc, values that compare very well with independent estimates.
Key words: ISM: clouds / ISM: structure / dust, extinction / methods: statistical
© ESO, 2011
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