Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934929g&link_type=abstract
American Astronomical Society, AAS Meeting #219, #349.29
Astronomy and Astrophysics
Astronomy
Scientific paper
The Inner Galaxy ALFA (I-GALFA) survey presents a new, richly-detailed view of neutral atomic hydrogen (HI) gas in the Galactic disk. Using the Arecibo 305m radio telescope and 7-beam ALFA receiver, we have mapped all HI 21cm line emission and absorption at Galactic longitudes 32 to 77 degrees and latitudes -10 to +10 degrees, with some extensions to 20-25 degrees off the plane. I-GALFA covers more than 1650 square degrees with a 4-arcminute beam and over 8 million observed spectra, using 0.184 km/s velocity channels covering LSR velocities from about -700 to +700 km/s. The brightness temperature RMS noise is 0.2 K in empty channels and 1 K in channels filled with bright emission. These combined parameters represent a breakthrough for studies of the diffuse interstellar medium in a wide range of environments. Newly-revealed features include finely-structured chimneys and worms in the disk-halo region, small and large expanding shells from ancient supernovae, intricate spiral structure in the far-side outer disk, and narrow-line cold HI emission and absorption in areas of molecular cloud formation. A public release of data is planned for January 2012. For more data access information and other details, please see http://www.naic.edu/~igalfa/.
The I-GALFA survey is one portion of the larger Galactic ALFA HI data set covering the entire sky between Declinations of -1 to +38 degrees visible with the Arecibo 305m telescope. Arecibo Observatory is part of the National Astronomy and Ionosphere Center, operated sequentially by Cornell University and Stanford Research Institute under Cooperative Agreement with the U.S. National Science Foundation.
Douglas Kevin Arthur
Gibson Steven J.
Heiles Carl
Kang Junhai
Koo B.
No associations
LandOfFree
GALFA HI: The Inner-Galaxy ALFA (I-GALFA) Low-Latitude HI Survey does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with GALFA HI: The Inner-Galaxy ALFA (I-GALFA) Low-Latitude HI Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GALFA HI: The Inner-Galaxy ALFA (I-GALFA) Low-Latitude HI Survey will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1582236