Molecular Cloud Distances via Principal Component Analysis

Details Molecular Cloud Distances via Principal Component Analysis Molecular Cloud Distances via Principal Component Analysis

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...567l..41b&link_type=abstract

The Astrophysical Journal, Volume 567, Issue 1, pp. L41-L44.

Astronomy and Astrophysics

Astronomy

7

Ism: Clouds, Ism: Kinematics And Dynamics, Ism: Molecules, Methods: Statistical, Radio Lines: Ism, Turbulence

Scientific paper

We demonstrate that principal component analysis of 12CO J=1-0 emission can be used to estimate distances to molecular clouds. The method rests on the assumption of a universal relationship between velocity dispersion and spatial scale within the clouds. Our data do not in fact support an exact universal relationship, but the influence of intercloud variability results in a ~30% uncertainty in derived distances only. We establish a calibration of the method for giant molecular clouds associated with H II regions of known distance.

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