Measuring Dense Clouds with X-rays and Millimeter Waves

Details Measuring Dense Clouds with X-rays and Millimeter Waves Measuring Dense Clouds with X-rays and Millimeter Waves

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1687s&link_type=abstract

Chandra Proposal ID #06400898

Astronomy and Astrophysics

Astronomy

Chandra Proposal Id #06400898

Scientific paper

Interstellar (IS) dust grains are a difficult puzzle for astronomers, but we can make significant strides by correlating high-resolution X-ray observations with velocity-resolved CO maps to probe dense molecular clouds, where previously only far-infrared data existed. We propose a small survey of moderately bright, moderately absorbed sources to measure their X-ray halos. We have chosen sources for which we have CO observations and which will have a detectable halo while not severely piling up the ACIS detectors. By constraining the dust models using the grain positions known from the CO measurements of molecular clouds, we will be able to measure total gas and dust masses as well as directly measuring coagulation or "mantling" inside dense clouds.

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