1. Radio Recombination Lines in the Milky Way
Image Credits:
Radio Recombination Lines in the
Milky Way
Marina Berezina (Max Planck IfR)
Kevin Hardegree-Ullman (Univ. of Toledo)
Yanina Metodieva (Univ. of Sofia)
Amanda Kepley (NRAO, GBT)
Based on HII Region Discovery Survey (HDRS)
Bania, T.M. + (2010)

2. Radio Recombination Lines (RRLs)
Used to measure distances to star forming regions in the Milky Way
Combine with other observations to study dust and gas in young massive clusters

3. Radio Recombination Lines (RRLs)
Electrons fall to lower levels within an atom and emit a photon - +

4. Data Collection/Reduction
Observed 7 RRLs in 10 HII regions within the galactic plane
Combined scans, baselined, fit Gaussian, obtained VLSR

5. Galactic Longitude (°)
VLSR
VLSR (km s-1)
+ velocities within solar circle, between us and galactic center
- Velocities, in outer galaxy
Galactic Longitude (°)
Dame, Hartmann, & Thaddeus (2001)

6. Future Analysis Compare to infrared emission
Learn more about star formation in the Milky Way