Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The VMC survey VII. Reddening map of the 30 Doradus field and the
  structure of the cold interstellar medium   Context: The details of how galaxies have evolved are imprinted in their star
formation history, chemical enrichment and morpho-kinematic structure.
Parameters behind these can be measured by combining photometric techniques
with modelling. However, there are uncertainties from the ambiguity of colour
and magnitude and the effects of interstellar reddening.
  Aims: In this paper we present a detailed reddening map of the central 30
Doradus region of the Large Magellanic Cloud; for community use and to test the
methods used. The reddening, a measurement of dust extinction, acts as a tracer
of the interstellar medium (ISM).
  Methods: Near infrared photometry of red clump stars are used to measure
reddening as extinction is the main cause of their colour and magnitude
variance. The star formation history is used to convert colour to reddening
values which are subsequently converted to visual extinction.
  Results: Presented is a dust map for the 30 Doradus field. This map samples a
region of 1x1.5 deg, containing ~1.5x10^5 red clump stars which probe reddening
up to AV=6 mag. We compare our map with maps from the literature, including
optical extinction maps and radio, mid- and far-infrared maps of atomic
hydrogen and dust emission. Through estimation of column density we locate
molecular clouds.
  Conclusions: This new reddening map shows correlation with equivalent maps in
the literature, validating the method of red clump star selection. We make our
reddening map available for community use. In terms of ISM the red clump stars
appear to be more affected by the cooler dust measured by 70 micron emission
because there is stronger correlation between increasing emission and
extinction due to red clump stars not being located near hot stars that would
heat the dust. The transition from atomic hydrogen to molecular hydrogen occurs
between densities of NH=4x10^21 to 6x10^21 cm^-2.

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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: math