... We have studied scaling relations (virial mass versus CO luminosity, luminosity versus size, linewidth versus size) for molecular clouds in the 30 Dor and N 159 regions in the Large Magellanic Cloud. ... The study of molecular clouds in the Galaxy has resulted in a number of scaling relations between global cloud properties such as mass, density, luminosity, size and velocity dispersion (e.g. Larson (1981) , Scoville & Sanders (1987) , Solomon et al. ... Elmegreen B.G., 1989, ApJ , 338 , 178. ...

Millimeter dust continuum emission as a tracer of molecular gas in galaxies: comparison of SMC and Local GMCs Caroline Bot a project w/ Francois Boulanger, IAS France & Monica Rubio, Universidad de Chile Molecular clouds Sites of star formation Most of the molecular gas is in giant molecular clouds PROBLEM:H2 is quite impossible to observe directly in cold interstellar regions Use of tracers (CO, gamma rays, dust emission) CO(1-0) Dame et al. ... 2004 General trend in the SMC? ...

... 1997; Trager et al. ... In Pr'evot et al. (1984), this group determined the best (and often used) average UV extinction curve for the SMC from only three reddened stars (AZV 18, AZV 398, & SK 191). ... The star, SK 191, is an essentially unreddened star, making its extinction curve useless. ... The extinction curve for AZV 126 presented by Rodrigues et al. (1997) has a very shallow slope which is a result of comparing the unreddened star (AZV 126) to other unreddened stars of earlier spectral types....

Determination of the physical parameters of molecular clouds Riccardo Cesaroni INAF­Osservatorio Astrofisico di Arcetri, Firenze, Italy E-mail: cesa@arcetri.astro.it The most common methods to derive some of the physical parameters of Galactic molecular clouds are described in this lecture. Special attention is devoted to the derivation of the (column) density, mass, and temperature. ... In particular, we will discuss the derivation of the velocity field, temperature, (column) density, and mass. ...