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Jo-Anne Brown

Observations of the Galactic Magnetic Field from the International Galactic Plane Survey. Jo-Anne Brown. People. SGPS. CGPS. Russ Taylor Tom Landecker Andrew Gray Rob Reid Roland Kothes Dave Delrizzo Bulent Uyaniker Marta Peracaula. Marijke Haverkorn Bryan Gaensler

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Jo-Anne Brown

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  1. Observations of the Galactic Magnetic Field from the International Galactic Plane Survey Jo-Anne Brown

  2. People SGPS CGPS • Russ Taylor • Tom Landecker • Andrew Gray • Rob Reid • Roland Kothes • Dave Delrizzo • Bulent Uyaniker • Marta Peracaula • Marijke Haverkorn • Bryan Gaensler • Natalya Bizunok • Naomi McClure-Griffiths • John Dickey • Anne Green

  3. People SGPS CGPS • Russ Taylor • Tom Landecker • Andrew Gray • Rob Reid • Roland Kothes • Dave Delrizzo • Bulent Uyaniker • Marta Peracaula • Marijke Haverkorn • Bryan Gaensler • Natalya Bizunok • Naomi McClure-Griffiths • John Dickey • Anne Green

  4. Outline • Introduction • Observations: CGPS • Observations: SGPS • Summary

  5. The Galactic Magnetic Field • field is concentrated in disk • follows the spiral arms • local field is cw • Sagittarius field is ccw • additional reversals unclear • Determining the location of reversals may help understand the evolution of the field.

  6. Faraday Rotation

  7. Probes of the Field EGS Pulsars

  8. Compact Polarised Sources Pulsars: 529

  9. Compact Polarised Sources Pulsars: 529 EGS: 887 First Large Catalog of EGS (555 sources): Simard-Normandin, M, P. P. Kronberg, Button, S (1981) ApJS, 45, 91

  10. Low-latitude Polarised Sources Pulsars: 375 EGS: 121

  11. Low-latitude Polarised Sources Pulsars: 375 EGS: 121 CGPS SGPS

  12. Observations

  13. Canadian Galactic Plane Survey Pilot Project (PhD): Magdalen Normandeau

  14. CGPS Region: Pulsars and EGS

  15. CGPS Region: Pulsars and EGS

  16. Science with the CGPS • Field Alignment with the spiral arms • Reversals in the outer Galaxy • Small-scale field correlation with the large-scale field. • Latitude Dependence

  17. Science with the CGPS • Field Alignment with the spiral arms • Reversals in the outer Galaxy • Small-scale field correlation with the large-scale field. • Latitude Dependence

  18. Appropriate Longitude Range 135o 105o

  19. Previous Studies Data ranges: Lyne & Smith (1989):105o < l < 135o, |b| < 30o Han et al. (1999): 104o < l < 119o, |b| < 30o

  20. Path Length Comparison

  21. CGPS for 105o < l < 135o

  22. Combining Pulsars with CGPS EGS: No detectable magnetic field reversal in the outer Galaxy. Published: ApJ, 592:L29-L32, July 2003

  23. Science with the CGPS • Field Alignment with the spiral arms • Reversals in the outer Galaxy • Small-scale field correlation with the large-scale field. • Latitude Dependence

  24. CGPS Region: Pulsars and EGS

  25. RM vs Latitude

  26. RM vs Latitude

  27. Calculating the Scale Height

  28. Calculating the Scale Height

  29. Southern Galactic Plane Survey PhD Thesis: Naomi Mclure-Griffiths

  30. SGPS Region: Pulsars and EGS

  31. SGPS Region: Pulsars and EGS

  32. Comparing CGPS and SGPS

  33. RM vs Longitude: SGPS

  34. RM Modulation by Spiral Arms

  35. Binned CGPS RMs over Stokes I Binsize: 3oStepsize: 0.5o

  36. Summary • IGPS has yielded much needed EG RMs - 1078 (so far) in CGPS I,II,III - 149 in SGPS (depolarization) • No B-Field reversals in the Outer Galaxy • Rough calculations show magneto-ionic scale height of ~1.2 kpc at l=110o • RM “oscillations” may correlate with HII or arms

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