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Probing Metallicity Across the Galactic Disk with the GBT

This study investigates the metallicity of HII regions across the Galactic Disk using data from the Green Bank Telescope (GBT). By analyzing electron temperature and metallicity through radio recombination lines and free-free continuum emission, we reveal important azimuthal structures and radial gradients in oxygen-to-hydrogen ratios (O/H). Our findings indicate a slope for O/H radial gradients ranging from -0.03 to -0.08 dex/kpc, contributing to the understanding of chemical evolution in the Milky Way.

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Probing Metallicity Across the Galactic Disk with the GBT

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  1. Probing Metallicity across the Galactic Diskwith the GBTDana S. Balser(NRAO)L.D. Anderson (WVU), T.M. Bania (BU), & T.V. Wenger (BU) Photo: Harry Morton

  2. HII Region Electron Temperature and Metallicity RRL and free-free continuum emission in LTE at 3 cm. Shaver+ (1983)

  3. HII Region Sample Sun 18 HRDS GC GBT + 140 Foot Quireza+ (2006); Balser+ (2011)

  4. Electron Temperature Radial Gradient

  5. Electron Temperature Azimuthal Structure GBT Sample

  6. O/H Radial Gradient Slope (dex/kpc)

  7. Summary • HRDS Probes Metallicity Across the Galaxy • Azimuthal Structure • O/H radial gradients: -0.03 to -0.08 dex/kpc

  8. Questions

  9. Extra Slides

  10. GBT/140 Foot Cross Calibration Balser+ (2011)

  11. Open Cluster Data Balser+ (2011)

  12. O/H Radial Gradient - GBT

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