Using Extinction to Measure Distances to Distant Clouds

Details Using Extinction to Measure Distances to Distant Clouds Using Extinction to Measure Distances to Distant Clouds

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541516f&link_type=abstract

American Astronomical Society, AAS Meeting #215, #415.16; Bulletin of the American Astronomical Society, Vol. 42, p.263

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Infrared Dark Clouds (IRDCs) are a sample of cold, dense, massive clouds seen as shadows against the galaxy. Some IRDCs contain active high-mass star formation, and others may represent the earliest stage in the formation of massive stars. Accurate determination of the physical properties of IRDCs require good distance estimates. Kinematic distances have been used to estimate distances to these objects, both using dense gas lines (CS) and morphological matching of low density gas (CO). Marshall et al. (2009) used 2MASS photometry and a stellar population model to estimate the distances to several IRDCs and found a systemic offset from the kinematic distances. We present an independent method for obtaining extinction distances to IRDCs and assess the reasons for the systemic distance offset presented in Marshall et al. (2009).

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