AAS 198th Meeting, June 2001
Session 55. Measuring the History of Star Formation using the Rest Ultraviolet
Display, Wednesday, June 6, 2001, 10:00am-7:00pm, Exhibit Hall

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[55.05] The UV color gradients within nearby ellipticals and spiral bulges as probes of their formation history

S.-J. Yoon, Y.-W. Lee, S. Yi, Y.-J. Sohn, S.-C. Rey, Y.-I. Byun (Center for Space Astrophysics, Yonsei University, Seoul 120-749, Korea)

Far UV observations from UIT mission found strong radial gradients in UV colors within several nearby ellipticals and spiral bulges. Population models suggest this is due to the radial gradient in either age or metallicity of the underlying stellar populations. GALEX AIS mode will provide higher S/N data for a larger sample of nearby galaxies for this phenomenon. When combined with the metallicity gradient data from the HST and ground-based telescopes, these data will provide strong constraint on the formation history of the early-type systems.

The author(s) of this abstract have provided an email address for comments about the abstract: sjyoon@csa.yonsei.ac.kr

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