A large scale extinction map of the Galactic Anticenter from 2MASS

Details A large scale extinction map of the Galactic Anticenter from 2MASS A large scale extinction map of the Galactic Anticenter from 2MASS

2007-04-23

arxiv.org/abs/0704.2993v1

Mon.Not.Roy.Astron.Soc.378:1447-1460,2007

Astronomy and Astrophysics

Astrophysics

18 pages, 29 Figures, 1 Table, Accepted for publication by MNRAS, A version with higher resolution figures can be found at h

Scientific paper

10.1111/j.1365-2966.2007.11886.x

We present a 127deg x 63deg extinction map of the Anticenter of the Galaxy, based on and colour excess maps from 2MASS. This 8001 square degree map with a resolution of 4 arcminutes is provided as online material. The colour excess ratio / is used to determine the power law index of the reddening law (\beta) for individual regions contained in the area (e.g. Orion, Perseus, Taurus, Auriga, Monoceros, Camelopardalis, Cassiopeia). On average we find a dominant value of \beta=1.8+-0.2 for the individual clouds, in agreement with the canonical value for the interstellar medium. We also show that there is an internal scatter of \beta values in these regions, and that in some areas more than one dominant \beta value is present. This indicates large scale variations in the dust properties. The analysis of the A_V values within individual regions shows a change in the slope of the column density distribution with distance. This can either be attributed to a change in the governing physical processes in molecular clouds on spatial scales of about 1pc or an A_V dilution with distance in our map.

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