Astro Seminar: Feedback, Scattering, and Structuring Dwarf Irregular Disks
| Date/Time: | Friday, 22 Sep 2017 from 4:10 am to 5:10 am |
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| Location: | Rm. 38, Physics Bldg. |
| Cost: | 0.0 |
| Contact: | Curt Struck |
| Phone: | 515-294-3666 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
Dwarf irregular galaxies have exponential stellar surface brightness profiles, observed in some cases out to about 10 scale lengths. Given the varied histories of star formation and other disturbances in dwarfs this is surprising. A variety of explanations have been proposed to explain the apparently ubiquitous exponential brightness profiles in galaxy disks. Some of these do not work well in dwarf irregulars, such as near exponential formation profiles, or radial 'churning' due to spiral waves or bars, which are uncommon in rising rotation curve dwarf disks. We have been studying the role of a wide range of scattering processes which might affect the surface brightness profiles in disks. This includes scattering via holes or shells which are common in dwarf disks with vigorous star formation. These scattering processes do generally evolve profiles towards exponential-like forms. I will review these results and the results of other relevant simulations.