Reconstructing Deconstruction: High-Velocity Cloud Distance Through Disruption Morphology

Peek, J. E. G.; Putman, M. E.; McKee, Christopher F.; Heiles, Carl; Stanimirovic, Snezana

Reconstructing Deconstruction: High-Velocity Cloud Distance Through Disruption Morphology

Authors

Peek, J. E. G.

Putman, M. E.

McKee, Christopher F.

Heiles, Carl

Stanimirovic, Snezana

Description

We present Arecibo L-band Feed Array 21-cm observations of a sub-complex of HVCs at the tip of the Anti-Center Complex. These observations show morphological details that point to interaction with the ambient halo medium and differential drag within the cloud sub-complex. We develop a new technique for measuring cloud distances, which relies upon these observed morphological and kinematic characteristics, and show that it is consistent with H-alpha distances. These results are consistent with distances to HVCs and halo densities derived from models in which HVCs are formed from cooling halo gas.
8 pages, 2 figures, 1 tabe, Accepted to ApJ