Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934928b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #349.28
Other
Scientific paper
An essential step in the formation of new stars is the condensation of ambient neutral atomic hydrogen (HI) into the molecular phase (H2). It is well known that molecular clouds collapse to form protostars, but less understood is how molecular clouds themselves begin to form. The process is difficult to study because the transition from HI to H2 is not very energetic, which limits direct observations. We study this process indirectly, by examining the interstellar dust within these H2-forming clouds. The dust is readily observed via infrared thermal emission. We use HIRES IRAS and Spitzer IRAC and MIPS imaging photometry to investigate a target cloud in the Perseus spiral arm in the which the HI-to-H2 transition appears to be underway, as evidenced by strong HI self-absorption, variable CO emission, and significant ``excess'' infrared emission. We have sampled the dust spectral energy distribution (SED) at many positions on and off this cloud in all IRAS and Spitzer photometric bands. We interpret these data by fitting the SEDs with the DustEM infrared emission model and infer the grain population composition and evolutionary status in this H2-forming cloud and others like it.
Bell Aaron C.
Boulanger Francois
Brunt Chris M.
Carey Sean
Douglas Kevin Arthur
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