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Photo: Harry Morton

Probing Metallicity across the Galactic Disk with the GBT Dana S. Balser (NRAO) L.D . Anderson (WVU), T.M. Bania (BU), & T.V. Wenger (BU). Photo: Harry Morton. HII Region Electron Temperature and Metallicity. RRL and free-free continuum emission in LTE at 3 cm . Shaver+ (1983).

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Photo: Harry Morton

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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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