Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924411k&link_type=abstract
American Astronomical Society, AAS Meeting #219, #244.11
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new EVLA D-configuration data of the Leo Ring. The 21cm observations show high spatial and spectral resolution maps of the ring in neutral hydrogen.
The region associated with the ring is located at a distance of 10 Mpc,
and consists of an intermediate density group of galaxies when compared with the denser Virgo Cluster to the east. Whereas single-dish observations are sensitive to large-scale diffuse features,
the interferometric data are sensitive to the population of small dwarf galaxies (˜ 0.08 Jy km/s and 20 km/s).
The nine field mosaic (covering the 200 kpc diameter HI ring) consists of 8 hours per field with a 4 MHz bandwidth (covering over 800 km/s in cz space) on the new EVLA WIDAR correlator allowing for coverage of all the spectral features of the ring and galaxy group. The correlator setup gives a 1.953 kHz channel spacing (˜ 0.5 km/s at the HI line). The synthesized beam for this configuration is ˜ 45" (2.2 kpc at the Leo distance).
The data allow us to constrain models for the origin of the HI ring (primordial vs. stripped)
and to search for dwarfs in the ring to a limiting HI mass of ˜ 106 M&sun;.
We report on preliminary HI results and compare with the CFHT mosaic images from the literature.
Bekki Kenji
Chung Aeree
Kent Brian R.
Morrison Glenn Evan
Ott Jorgen
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