Computer Science
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..150v&link_type=abstract
NOAO Proposal ID #2010A-0150
Computer Science
Scientific paper
Deep H(alpha) images of irregular dwarf galaxies show a wealth of expanding filamentary and shell-like structures whose fate is still poorly understood. Theoretical models which try to explain the formation and evolution of these galaxies require galactic winds. However, no clear evidence of a galactic wind in a local star-forming dwarf galaxy has been found, so far. This apparent contradiction appears to be based on the technical difficulties of such an observation. We here propose a new approach using the WIYN telescope equipped with SparsePak in Echelle mode and centred at H(alpha) in order to spectroscopically resolve the H(alpha) line and to measure the kinematics of even the faintest shell structures in two well-studied dwarf galaxies, NGC 2366 and NGC 4861. SparsePak is an excellent instrument for this kind of analysis as it has a large field of view and as it provides us with a sufficiently high spectral resolution. We want to decompose the H(alpha) line and search for expanding gas. A comparison with the escape velocity of the host galaxies will reveal its fate.
Beswick Robert
Gallagher John Jay
Lopez-Sanchez Angel R.
Meaburn John
van Eymeren Janine
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