Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724606t&link_type=abstract
American Astronomical Society, AAS Meeting #217, #246.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The Arecibo Galactic Environment Survey (AGES) is a 21-cm neutral hydrogen survey utilizing the Arecibo L-band Feed Array on the 305-m radio telescope at Arecibo Observatory. AGES uses a bandwidth of 100 MHz, allowing the detection of galaxies out to heliocentric velocities of 20000 km/s. Many different galaxy environments are being examined in AGES including isolated galaxies, where one objective is to find possible low surface brightness companion galaxies.
The field surrounding isolated galaxy UGC 2082 was examined for this project, and 90 possible sources were found in the data cube. Of these, 46 are regarded as definite detections; the others will be re-observed with the L-Band Wide receiver at Arecibo Observatory in order to confirm their reality. Using optical data from the Sloan Digital Sky Survey and SuperCOSMOS the most likely optical counterparts have been chosen for each 21-cm source. 24 of the detected HI sources have no clear optical counterpart, many of these being dubious detections.
A very faint companion galaxy to UGC 2082 was found at a heliocentric velocity of 590 km/s. This source is located approximately 66.5 arcminutes north of UGC 2082 (which has a measured heliocentric velocity of 713 km/s). Using the published Tully-Fisher distance to UGC 2082 of 14.7 Mpc, the projected physical separation of the two galaxies is 284.4 kpc.
Another objective of AGES is to gain insight on the HI mass function and the large-scale structure of the universe. All of the detected sources in this data were plotted by right ascension or declination versus heliocentric velocity. These plots showed noticeable structure at both 5500 km/s and 11000 km/s.
The Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a cooperative agreement with the National Science Foundation.
AGES
Minchin Robert
Taber Timothy M.
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