Ultraviolet Imaging of Starburst Rings in Disk Galaxies at Low and High Redshift

Details Ultraviolet Imaging of Starburst Rings in Disk Galaxies at Low and High Redshift Ultraviolet Imaging of Starburst Rings in Disk Galaxies at Low and High Redshift

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.8906w&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #89.06; Bulletin of the American Astronomical Society, Vol. 29, p.1357

Astronomy and Astrophysics

Astronomy

Scientific paper

Imaging in the restframe ultraviolet has proven to be an effective and vital means of tracing starbirth activity in galaxies out to high redshifts. Using images from the Ultraviolet Imaging Telescope (UIT), Hubble Space Telescope (HST), and complementary optical telescopes, we have investigated the starburst activity and associated dynamics in nearby ringed disk galaxies. Concentrating on the Sab-type starburst-ring galaxy M94 (NGC 4736), we find that most of the star formation is being orchestrated via a nuclear mini-bar/inner-ring/oval-disk/outer-ring dynamic. The inner starburst ring and bi-symmetric knots at intermediate radius, in particular, argue for bar-mediated resonances as the primary drivers of evolution in M94 at the present epoch. Similar ring-bar dynamics may prevail in the centers of the ``core-halo'' galaxies that have been marginally resolved at high redshift. The gravitationally lensed ``Pretzel Galaxy'' (0024+1654) at a redshift of ~ 2 provides an important precedent in this regard, wherein reconstructions of the galaxy's emitting structure clearly show an annular morphology in the restframe UV. \centerline {Reference} \hang Waller, W. H. et al. 1997, in The Ultraviolet Universe at Low and High Redshift: Probing the Progress of Galaxy Evolution, eds. W. H. Waller, M. N. Fanelli, J. E. Hollis, & A. C. Danks (New York: AIP Press), p. 39

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