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Radio Astronomy And The Spiral Structure Of The Milky Way. Jess Broderick Supervisor: Dr George Warr. Outline. Overview of the spiral arm structure of the Milky Way. Using radio astronomy to detect the spiral structure. The Spiral Arm Structure Of The Milky Way.

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radio astronomy and the spiral structure of the milky way
Radio Astronomy And The Spiral Structure Of The Milky Way

Jess Broderick

Supervisor: Dr George Warr

outline
Outline
  • Overview of the spiral arm structure of the Milky Way.
  • Using radio astronomy to detect the spiral structure.
the spiral arm structure of the milky way
The Spiral Arm Structure Of The Milky Way
  • Optical spiral tracers: O & B type stars, open star clusters, emission nebulae (HII) regions.
  • Optical observations limited in effectiveness due to clouds of interstellar dust.
  • Solution: Use radio wavelengths to study the spiral structure, eg. 21 cm line of neutral hydrogen.
mapping the spiral arms of the milky way
Mapping The Spiral Arms Of The Milky Way
  • Starting point: Map the intensity of neutral hydrogen along the Galactic plane for various Galactic longitudes.
  • As a result of this procedure, it has been shown that the neutral hydrogen appears to be concentrated in the spiral arms of the Milky Way.
uncertainties involved in detecting the spiral structure using radio astronomy
Uncertainties Involved In Detecting The Spiral Structure Using Radio Astronomy
  • Assuming circular model of rotation of gas.
  • Range of phenomena near the Galactic plane.
  • Ambiguity in the overall flux density profile.
h karttunen et al fundamental astronomy
H. Karttunen et. al., Fundamental Astronomy.

Sun

Galactic Centre

Intensity

Radial Velocity

conclusion
Conclusion
  • Radio observations can be used to provide a more comprehensive analysis of the Milky Way’s spiral structure than optical observations allow.
  • Uncertainties involved in interpreting the neutral hydrogen flux density profiles.
  • It can be concluded that 21 cm hydrogen observations do indeed indicate spiral structure on a large scale in the Galactic plane.