probing galactic central region of normal galaxies with photometric method august, 27, 2002 student...
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![Page 1: Probing Galactic Central Region of Normal Galaxies with Photometric Method August, 27, 2002 Student Yeong-jyi Lei Advisor Chi Yuan Chien-Chang Yen](https://reader035.vdocuments.net/reader035/viewer/2022062515/56649c7d5503460f94932a46/html5/thumbnails/1.jpg)
Probing Galactic Central Region of Normal Galaxies with
Photometric Method
August, 27 , 2002
Student Yeong-jyi Lei
Advisor Chi Yuan
Chien-Chang Yen
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OutlineIntroduction of Hubble sequence
Our candidates
Photometric method :Wavelet method
Observation results
Compare our result with other photometrical method
Conclusion
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Hubble Tuning-fork Diagram
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Typical Early-Type galaxies
IC 4296(E0) NGC 4365(E3) NGC4564(E6)
NGC 4623(E7) NGC 4251(S0) NGC 4340(SB0)
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Typical normal Spirals
NGC4736(Sb)NGC3898(Sa)
NGC4321(Sc) NGC4594(Sa/Sb)
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Typical Barred Spirals
NGC 175 (SBab) NGC 1300 (SBb) NGC 2525(SBc)
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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)
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Introduction to wavelet method
+ +
= Wavelet
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:
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NGC1667(Sc)
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NGC4321(Sc)
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NGC5055(Sbc)
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NGC5005(Sb)
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NGC5806(Sb)
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NGC4698(Sa)
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NGC4459(S0)
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NGC3412(S0)
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Clear spiral Not clear No spiral
S0 1 6
Sa 1 5
Sab 1
Sb 2 4
Sbc 2 3 1
Sc 5 2
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Compare our result with other photometrical method
(NGC7743 SBa)
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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.