The GALFA-HI Survey: Probing the Anatomy of Galactic Neutral Hydrogen

Details The GALFA-HI Survey: Probing the Anatomy of Galactic Neutral Hydrogen The GALFA-HI Survey: Probing the Anatomy of Galactic Neutral Hydrogen

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724105p&link_type=abstract

American Astronomical Society, AAS Meeting #217, #241.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

The Galactic HI survey with the Arecibo L-band Feed Array (GALFA-HI) is observing the whole Arecibo sky (about 13,000 square degrees), with high angular (3.5 arcmin) and velocity resolution (0.2 km s-1). The unprecedented angular and velocity resolution allow studies of the Galactic gaseous disk, halo, and the flow of material between them. The survey operates mainly commensally with other ALFA surveys, saving thousands of hours of telescope time.
The 7-beam feed array ALFA is tuned to the hyperfine transition of HI at 1420.405 MHz, and a specially developed method the Least-Squares Frequency Switching is used for bandpass fitting.
The survey uses a combination of basket-weave and drift observing modes,
and the final data products are in the form of RA x Dec x Velocity data cubes.
From these cubes we can create detailed images of the Galactic HI, and other galaxies. The reduced data are released publicly at http://sites.google.com/site/galfahi/data. We present the current survey and data release status and examples of GALFA-HI images in different visualization modes.
This research was partially funded by the NSF grant #AST-0707679 and the Research Corporation for Science Advancement.
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N. Pingel1, S. Stanimirovic, A. Begum1, K. A. Douglas2, S. J. Gibson3, J. Grcevich4, C. Heiles5, M. Lee1, E. J. Korpela5, J. Peek4, M. Putman4, D. Saul4
1UW-Madison, 2Univ. of Exeter, United Kingdom, 3Western Kentucky University, 4Columbia University, 5UC-Berkeley.

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