Inverting the Large Velocity Gradient

Details Inverting the Large Velocity Gradient Inverting the Large Velocity Gradient

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514004h&link_type=abstract

American Astronomical Society Meeting 205, #140.04; Bulletin of the American Astronomical Society, Vol. 36, p.1577

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Scientific paper

Large velocity gradient (LVG) models use an assumption that simplifies radiative transfer, allowing us to ignore the velocity of an entire molecular cloud, and concentrate solely on a small region. In the past, observational sub-millimeter astronomers did not have large amounts of data and thus the LVG inversion was done by hand. However, because of recent technological improvements and the advent of large sub-millimeter data sets, the need for an automated inversion has become more pressing. Many of the LVG models that we examined were developed to output tables listing abundance ratios between isotopes given a particular kinetic temperature, Tkin, and density, nH2. We approach the problem from the other direction by looking at the measured J-transition tables of CO, 13CO, C18O, and CI, and determining the Tkin and nH2 for thousands of points in the molecular cloud that we are examining.

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