http://arxiv.org/abs/1401.7398
We present an analysis of the HI and CO gas in conjunction with the Planck/IRAS sub-mm/far-infrared dust properties toward the most outstanding high latitude clouds MBM 53, 54, 55 and HLCG 92-35 at b = -30 – -40 degrees. The CO emission, dust opacity at 353 GHz (tau353), and dust temperature (Td) show generally a good spatial correspondence. On the other hand, the correspondence between the HI emission and the dust properties is less clear than in CO. The integrated HI intensity WHI and tau353 show a large scatter with a correlation coefficient of ~ 0.6 for a Td range from 16 K to 22 K. We find however that WHI and tau353 show better correlation for smaller ranges of Td every 0.5 K, generally with a correlation coefficient of 0.8 – 0.9. We set up a hypothesis that the HI gas associated with the highest Td of 22 K is optically thin, whereas the HI emission is generally optically thick for Td lower than 22 K. We have determined a relationship for the optically thin HI gas between atomic hydrogen column density and tau353, NHI (cm-2) = (1.5×10^26) x tau353, under the assumption that the dust properties are uniform, and applied it to estimate NHI from tau353 for the whole cloud. NHI was then used to solve for Ts and tauHI over the region. The result shows that the HI is dominated by optically thick gas having low spin temperature of 20 – 40 K and density of 40 – 160 cm-3. The HI envelope has a total mass of ~ 2.0×10^4 Msol, an order of magnitude larger than that of the CO clouds.
Thu, 30 Jan 14
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