NOAO >   Observing Info >   Approved Programs >   2010A-0150

Small NOAO Logo

Proposal Information for 2010A-0150


PI: Janine van Eymeren, JBCA, The University of Manchester, Janine.VanEymeren@manchester.ac.uk
Address: Physics Department, Oxford Road, Manchester M13 9PL, United Kingdom

CoI: Robert Beswick, JBCA, The University of Manchester
CoI: Jay Gallagher, University of Wisconsin-Madison
CoI: \rm \acuteAngel R. L\acuteopez-\rm S\acuteanchez, ATNF, CSIRO
CoI: John Meaburn, JBCA, The University of Manchester

Title: The kinematics of ionised gas shells in nearby irregular dwarf galaxies

Abstract: 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.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2010A-0150

noaoprop-help@noao.edu

Small NOAO Logo