Spatial Heterodyne Spectroscopy (SHS) and Diffuse [OII] Emission


David Fallest
Beloit College

University of Wisconsin-Madison
Summer REU in Astrophysics 2005
Advisor: Dr. Edwin Mierkiewicz

Understanding the composition of the Warm Ionized Medium (WIM) is important to understanding the make-up of the galaxy and universe. Observations of distant objects are necessarily taken through the WIM, thus is it essential to understand its composition and structure in order to fully understand any observations made. The Wisconsin H-Alpha Mapper (WHAM) has recently completed it’s Northern Sky Survey of H-alpha emission. The results of the WHAM survey show evidence of variations in the electron temperature within the WIM and suggests an additional heating source of the WIM beyond the photoionization heating already known. In order to confirm the existence of the additional heating new observations must be made. Emission lines of the [OII] 3727Å doublet are excellent diagnostics for this.

Intro SHSResearchUW-Madison REU Student Research