Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.8905r&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #89.05; Bulletin of the American Astronomical Society, Vol. 33, p.918
Astronomy and Astrophysics
Astronomy
Scientific paper
We have made high--resolution, wide--field HI images of High--Velocity Clouds (HVCs) and Local Group dwarf galaxies using the upgraded Arecibo telescope. Each map covers an area of ~1 square degree at a resolution of 3 arcmin; previous observations were generally either high--resolution or wide--field, but not both. Integration times were ~10 s per pointing, yielding an RMS noise of ~0.18 K in a 0.64 km s-1 channel. We compare results from maps made with two observing techniques, on--the--fly mapping and drift scanning; both were plagued by baseline ripples which masked low--level emission. We present a method for removing these ripples which significantly improves the image quality, and demonstrate how this technique was applied to disentangle the HI emission in the vicinity of the Local Group dwarf LGS3. Our image shows an HI cloud associated with the galaxy as well as an HVC offset by ~30 arcmin. An apparent tidal feature in the HI emission suggests that the HVC is at the same distance as LGS3. This research was partially supported by the National Science Foundation.
Blitz Leo
Heiles Carl E.
Robishaw Timothy
Simon Joshua D.
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