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Mapping of HI Distribution in NGC 1530

Mapping of HI Distribution in NGC 1530. Chu, Thomas P.-H. Supervisor : Dinh, Van Trung. Mapping of HI Distribution in NGC 1530. Method of Observation Properties of NGC 1530 Summary. Velocity. Doppler effect. Channel Maps. Line Profile. Butterfly Pattern. Moment. Moment 0 Intensity

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Mapping of HI Distribution in NGC 1530

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  1. Mapping of HI Distribution in NGC 1530 Chu, Thomas P.-H. Supervisor :Dinh, Van Trung

  2. Mapping of HI Distribution in NGC 1530 • Method of Observation • Properties of NGC 1530 • Summary

  3. Velocity • Doppler effect

  4. Channel Maps

  5. Line Profile

  6. Butterfly Pattern

  7. Moment • Moment 0 • Intensity • Moment 1 • Intensity weighted mean velocity • Moment 2 • Velocity width V: velocity F: flux I: intensity

  8. NGC 1530 • Position • RA=04 23 26.800 • Dec=75 17 45.000 • Velocity • 2461±140 Km/sec • Distance • 32.8Mpc • Mass of HI : • 1.18*1010*M_sun • Bar Size: 2.848’ • Inclination: 45 ± 5˚

  9. HI Observational Parameters. • Date of observation:15-AUG-1997 • Length of observation: 3 hours • Synthesized beam: 21.02” * 16.97” • Number of channels: 63 • Channel separation: 10.47 Km/sec

  10. Major Axis=7’

  11. Moment 1

  12. Moment 2

  13. Mass Flux: 1.20294E+06 in JY/B*M/S = 47584.651899 JY * M/S Distance: Hubble’s Law v=H*Distance => 2461=75*Distance Distance=2461/75=32.813 Mpc =>

  14. Argument • Rotation or Inflow?

  15. Rotation or Inflow?

  16. Evidence from Maps

  17. Calculation • Bar Length: 27.17 Kpc • Velocity of Flow: < 10.47 km/sec • Time : >1.2*109 years • Universe Age: 1.5*1010 years

  18. Summary

  19. Calculation • Beam size: ~20” = 3180 pc • Velocity of Flow: < 10.47 km/sec • Wasting time: ~2.97*108years

  20. Optical Image

  21. Antenna

  22. Continuum Image

  23. Beam

  24. Weighting • Natural Weighting • Dk=1 => sensitivity • Uniform Weighting • Dk=1/Ns(k) => angular resolution • Robust: • Between Natural and Uniform

  25. Moment 0 in different Robust R=5 R=3 R=-2 R=-4

  26. R=-4

  27. Moment 1 in different Robust R=5 R=3 R= -2 R= -4

  28. R= -2

  29. Phase Calibrator

  30. Phase Calibrator

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