(Cancelled) Observing Lyman alpha emitters - How does Lyman alpha escape from galaxies?
Astronomy and astrophysics
Friday 29 January 2016
to 11:30 at
Andreas Sandberg (Stockholm University)
The Lyman alpha emission line can be used to find and verify galaxies at high redshift, but the emission is only seen in a minority of galaxies. In this talk, I will explain the physics of Lyman alpha and how we believe it escapes from a galaxy. I will review the work included in my thesis, which I will defend in March. The individual papers explore both nearby galaxies and galaxies at z~2, and look at how different intrinsic properties affect the Lyman alpha emission and absorption. In nearby galaxies we are able to see a lot of detailed structure and explore the geometry and kinematics of the neutral gas and the effects of dust. At higher redshifts, we must instead look at statistical quantities. We find that Lyman alpha emitters tend to be compact systems with signs of recent elevated star formation, but we also see cases of larger, dusty systems. I will discuss possible interpretations of these observations as well as review how we plan to move forward.