The FIR_HI Relationship In High Velocity Clouds

Details The FIR_HI Relationship In High Velocity Clouds The FIR_HI Relationship In High Velocity Clouds

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4916l&link_type=abstract

American Astronomical Society Meeting 208, #49.16; Bulletin of the American Astronomical Society, Vol. 38, p.127

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the Green Bank Telescope of the NRAO, we have mapped the 21cm emission from HI in several Galactic high-velocity clouds (HVCs) in order to study their dust properties and far-IR emission. High-velocity HI clouds have two outstanding characteristics: a velocity which is grossly inconsistent with normal Galactic rotation, and an extremely low I$_{100\mu}$ emissivity compared to normal disk gas. Recently, Miville-Desch\^{e}nes et al. (2006, ApJ, 631, L57) analyzed the HI-I$_{100\mu}$ correlation in the Spitzer Extragalactic First Look Survey field and detected the FIR emission from a HVC for the first time. The implied properties of the HVC, however, are unusual. We have now mapped the HI in four fields, using the GBT at 9' angular resolution. Three of the fields lie on Complex C and the fourth on the Magellanic stream. The directions were chosen so that the HVC would be a major fraction of the total HI and have strong spatial structure. This will make cross-correlation of the Infrared emission with various HI spectral components more robust. Comparison with the I$_{100\mu}$ in these fields is underway. We will report on the results of this analysis and its implications for the nature of dust in HVCs. The NRAO is operated by Associated Universities, Inc., under a cooperative agreement with the NSF.

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