The Outer Banks of the Island Universes: A Spectroscopic Perspective

Details The Outer Banks of the Island Universes: A Spectroscopic Perspective The Outer Banks of the Island Universes: A Spectroscopic Perspective

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396..193c&link_type=abstract

Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at

Astronomy and Astrophysics

Astronomy

Scientific paper

We have carried out a survey of the outer disks of nearby disk galaxies using optical spectroscopy. Multi-hour spectroscopy reveals Hα emission far beyond the typical extent of optical rotation curves, to approximately 50% beyond the optical radius R_{25}, and yields information on kinematics, star formation, and metallicities in the outer disk. Here, we report on the kinematics. In a sample of 16 predominantly late-type, optically isolated and undisturbed galaxies, we find evidence for kinematic anomalies in two cases: emission regions that do not obey disk-like kinematics, and a kinematically broad, low-surface brightness component of the Hα line.

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