|Description||Shardha Jogee, Ph.D.|
Professor, Department of Astronomy
University of Texas at Austin
How did Massive Galaxies Assemble over Cosmic Time?
Hierarchical Cold Dark Matter models of structure formation provide one of the most successful paradigms for the growth of dark matter on large scales, but central challenges remain in elucidating how massive galaxies grow over
cosmic time and across different environments. While violent galaxy majors were traditionally thought to play a dominant role in galaxy growth, I will present mounting evidence that the paradigm is changing to a view where more quiescent processes (minor mergers, gas accretion, and secular processes) play a key role. This evidence includes the surprising structure of nearby field spiral galaxies, and the cosmic star formation history over half
of the age of the Universe. I will also discuss how at even earlier cosmic epochs (~10-12 billion years ago) the most massive galaxies in the Universe have structures (e.g., extended disks) that present challenges for some of the best models of galaxy evolution. Finally, I will give an overview of new frontiers in galaxy evolution we can cross with the exciting HETDEX (Hobby
Eberly Telescope Dark Energy Experiment) survey, starting at McDonald Observatory in 2015.
For more information, please contact: Dr. Anzhong Wang 254-710-2276