New Frontiers in High-Velocity Clouds

Details New Frontiers in High-Velocity Clouds New Frontiers in High-Velocity Clouds

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21336003g&link_type=abstract

American Astronomical Society, AAS Meeting #213, #360.03; Bulletin of the American Astronomical Society, Vol. 41, p.509

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new discoveries pertaining to high-velocity clouds (HVCs) and modes of Galactic accretion. We introduce GALFA-HI, a Galactic HI survey conducted at Arecibo with unprecedented fidelity, resolution and scope. This survey has generated excellent maps of various HVC complexes, and we highlight new HVC distance results using morphology as a key indicator. We also show comparisons of the broader HVC population to simulations of an unstably cooling massive Galactic halo, and describe some predicted observables from these models. We discuss the impact these models have on overall Galactic accretion and whether they can supply sufficient gas for ongoing Galactic star formation. We demonstrate a new method for determining the dust-to-gas ratio of low-flux HI clouds in our Galaxy. We find that some of the low-velocity clouds in our Galaxy may be akin to HVCs, a group we call Low-Velocity Halo Clouds. Conversely, we also call into question the identity of some marginal HVCs, which may be more similar to local disk gas.

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