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Y. H. Joe (Yonsei, OCIW, & Caltech), B. F. Madore, A. Gil de Paz, S. Boissier (OCIW), Y. -W. Lee (Yonsei), J. Rhee (Yonsei & Caltech), S. -C. Rey (CNU, Yonsei, & Caltech), GALEX Science Team
In order to find the relationship between the spatial distribution of star forming regions and physical parameters of spiral galaxies, we are studying the rotational symmetry of several hundred nearby spiral galaxies observed by GALEX (Galaxy Evolution Explorer) in the UV and as part of the Carnegie H\alpha imaging survey. We have deprojected the galaxy images and computed the degree of symmetry as a function of rotation angle. We have then compared the results derived from UV and H\alpha images. This technique allows us to quantify the number of spiral arms in a galaxy and to measure the angular cross correlation. We further investigate the symmetry in various radial annuli and the influence of other physical properties such as morphology and color. In this poster, we present preliminary results and discuss some implications.
Key words: galaxies:structure -- galaxies:spiral galaxies
ACKNOWLEDGMENTS: Y.H.J. gratefully acknowledges support for this research by the KOSEF(Korea Science and Engineering Foundation). GALEX is a NASA Small Explorer, launched in April 2003. We gratefully acknowledge NASA's support for construction, operation, and science analysis for the GALEX mission. Yonsei University participation is funded by the MOST (Korean Ministry of Science & Technology), for which we are also grateful.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.