SMC B1-1 molecular cloud

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SMC B1-1 molecular cloud
Quiescent molecular cloud serendipitously
discovered in CO (Rubio et al. 1993)
Simple laboratory to study dust properties from
FIR/mm emission
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The other southern SMC molecular clouds

• Free-free contribution estimation thanks to ATCA
  continuum radio sources catalog
• M(1.2mm)/Mvirial

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LMC results

• 30 Dor the 1.2mm emission can be totally
  explained as thermal free-free emission.
• N4, continumm emission is due to a combination
  of free-
• free emission and dust emission, gtSED
  millimeter excess
• N159 S an LMC cold molecular cloud,
  MdustMvirial

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Conclusions
-fM(1.2mm)/Mvirial in the range 1 to 20 -the f
factor could be measuring the evolution stage of
the clouds -- gravitationnal concentration f
? -- photodissociation of CO after star
formation ? -- f minimum at the onset of star
formation? -future observations Apex, mm dust
observations, Herschel CI