Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21925210c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #252.10
Other
Scientific paper
The Galactic Arecibo L-Band Feed Array (GALFA) is mapping the Arecibo sky in 21-cm neutral hydrogen emission. Last summer, GALFA HI data and IRIS infrared data were used to analyze the dust-to-gas ratio across various regions of the sky, looking for trends across the galactic environment. Maps of infrared excess, or regions of the sky where the interstellar dust is not completely traced by atomic hydrogen, were created. As molecular hydrogen cannot be observed in emission, one motivation for this IR excess study was to help establish whether regions of IR excess can be used to trace cold, dense regions of the interstellar medium (ISM) where molecular hydrogen forms, and other molecular gas accrues. Such molecular clouds are the precursors to star formation. Several regions of interest, and one cloud in particular, known as MBM 53-55, stood out in the IR excess analysis. Spectral analysis of both HI and CO data in several regions of significant IR excess confirmed the presence of molecular gas in MBM 53-55, and provided confirmation that the method of IR excess analysis is a useful tool for predicting molecular gas in the diffuse ISM.
This work was funded by the NSF Arecibo Observatory REU Program.
Clark Susan
Douglas K.
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