Astronomy Seminar
| Date/Time: | Friday, 08 Apr 2016 at 4:10 pm |
|---|---|
| Location: | 38 Physics |
| Contact: | Steve Kawaler, Physics and Astronomy |
| Phone: | 515-294-5440 |
| Channel: | College of Liberal Arts and Sciences |
| Categories: | Lectures |
| Actions: | Download iCal/vCal | Email Reminder |
Exponential surface brightness profiles are ubiquitous in galaxy disks over a wide range of Hubble types and masses. Radial migration and scattering via bars, waves, and satellites have been suggested as causes, but most of these cannot account for the full range of the phenomenon. Numerical models of clump scattering show that this process can produce near-exponential or core-Sersic profiles in a variety of circumstances, also revealing a connection to bulge and elliptical galaxy profiles. Analytic models with these forms satisfy the dynamical equations in cases dominated by either halo potentials (outer disk) or self-gravity (inner disk), suggesting the forms are universal.