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Probing Galactic Central Region of Normal Galaxies with Photometric Method

Probing Galactic Central Region of Normal Galaxies with Photometric Method. August, 27 , 2002 Student Yeong-jyi Lei Advisor Chi Yuan Chien-Chang Yen. Outline. Introduction of Hubble sequence Our candidates Photometric method :Wavelet method Observation results

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Probing Galactic Central Region of Normal Galaxies with Photometric Method

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  1. Probing Galactic Central Region of Normal Galaxies with Photometric Method August, 27 , 2002 Student Yeong-jyi Lei Advisor Chi Yuan Chien-Chang Yen

  2. Outline Introduction of Hubble sequence Our candidates Photometric method :Wavelet method Observation results Compare our result with other photometrical method Conclusion

  3. Hubble Tuning-fork Diagram

  4. Typical Early-Type galaxies IC 4296(E0) NGC4564(E6) NGC 4365(E3) NGC 4623(E7) NGC 4251(S0) NGC 4340(SB0)

  5. Typical normal Spirals NGC4736(Sb) NGC3898(Sa) NGC4321(Sc) NGC4594(Sa/Sb)

  6. Typical Barred Spirals NGC 175 (SBab) NGC 1300 (SBb) NGC 2525(SBc)

  7. candidates • Our candidates are from the list of 183 disk galaxies, they are proposed by Luis Ho. • We choose the well-observed data, which have two properties: they are almost face-on and their origins are nearly in the center of images. (33 normal galaxies)

  8. Introduction to wavelet method Wavelet method provides us a multi-scale analysis. It decomposes data at some certain scale into different planes Wj , j=0,1,2,3,4,5,… . When we say wavelet planes 1 to 4, meaning W1+W2+W3+W4. The following is a numerical example: + + Wavelet =

  9. NGC1667(Sc)

  10. NGC4321(Sc)

  11. NGC5055(Sbc)

  12. NGC5005(Sb)

  13. NGC5806(Sb)

  14. NGC4698(Sa)

  15. NGC4459(S0)

  16. NGC3412(S0)

  17. Compare our result with other photometrical method (NGC7743 SBa)

  18. Conclusion • There is usually no spiral structure in the central region for Sa(S0) type and clear spiral structure for Sc type. • The evolution of normal galactic from Sc to Sa can be suggested by our observation.

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