17 November 2005

Speaker: Marla Geha (Carnegie Observatories)

Title: Dwarf Disk Galaxies: Exploring Dynamics and Baryon Content at the Faint-end of the Luminosity Function

Abstract: Dwarf galaxies are sensitive to processes such as feedback, ram pressure stripping, and tidal stripping that can dramatically affect their mass-to-light ratios and dynamics. I will present results from a combined optical and radio survey of dwarf galaxies selected from the Sloan Digital Sky Survey. This survey concentrates on much lower luminosities (Mr > -15) than any other field sample of dwarf galaxies with measured dynamics. I will explore how neutral gas and dynamical masses relate to stellar masses, star-formation rates, metallicities, and environments at these faint luminosities.

Video of the Presentation (Talks can be viewed with RealPlayer. Free download is available from www.real.com )

References for students:

1. Kravtsov, Gnedin and Klypin 2004, ApJ, 609, 482
2. Geha, Guhathakurta, Rich and Cooper 2005, astro-ph/0509561