The GALFA-HI Survey: From Pretty Images To Quantifying Interstellar Inhomogeneities

Type Conference Paper
Names Snezana Stanimirovic, A. Begum, K. A. Douglas, S. J. Gibson, J. Grcevich, C. Heiles, M. Lee, E. J. Korpela, J. Peek, M. Putman, N. M. Pingel, D. Saul
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society, AAS Meeting #217, #241.04
Volume 43
Date January 1, 2011
Short Title The GALFA-HI Survey
Library Catalog NASA ADS
Abstract Understanding the origin and nature of interstellar inhomogeneities in galaxies is a crucial step toward inclusion of realistic high-density regions in numerical simulations. Yet, driving sources and modes of interstellar turbulence -- an important ingredient for formation and evolution of interstellar structure -- have largely been unexplored even in the Galaxy. We use data products from the GALFA-HI survey in conjunction with results from recent numerical simulations to study the level of interstellar turbulence and make connections with the dominant underlying energy sources across different Galactic environments. The GALFA-HI survey has been mapping the Galactic neutral hydrogen (HI) distribution using the the Arecibo Observatory, the largest single-dish radio telescope in the world. The unsurpassed combination of sensitivity, resolution, and mapping speed of this survey result in stunning images of the Galaxy with high spatial and velocity dynamic range perfectly suited for studying the origin and nature of interstellar inhomogeneities. This research was partially funded by the NSF grant AST-0707679 and the Research Corporation for Science Advancement.
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