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Young stars in nearby early-type galaxies: The GALEX-SAURON perspective

Published online by Cambridge University Press:  05 March 2015

Hyunjin Jeong
Affiliation:
Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea email: hyunjin@kasi.re.kr
Sukyoung K. Yi
Affiliation:
Department of Astronomy, Yonsei University, Seoul 120-749, Korea
Martin Bureau
Affiliation:
Sub-Department of Astrophysics, University of Oxford, Oxford OX1 3RH, UK
Roger L. Davies
Affiliation:
Sub-Department of Astrophysics, University of Oxford, Oxford OX1 3RH, UK
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Recent studies from the Galaxy Evolution Explore (GALEX) ultraviolet (UV) data reveal that the recent star formation is more common in early-type galaxies (ETGs) that we used to believe (Jeong et al.2007). Here we used the unique GALEX UV data on existing SAURON IFU-studied galaxies and combined these two datasets (UV and IFU) to find where photometric anomalies occur. One of the highlights of our study is the work on the Fundamental Plane (FP). The tilt and scatter found in optical FPs have been an issue. From our sample of 34 ETGs, we found that most of the tilt and scatter are caused by the minority ETGs which have been forming stars recently at very low level (see figure 1). Using our UV FPs, we found a strong evidence for star formation history being the main source of the mystery (Jeong et al.2009).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

Jeong, H., Bureau, M., Yi, S. K., Krajnovic, D., & Davies, R. L. 2007, MNRAS 376, 1021Google Scholar
Jeong, H., et al. 2009, MNRAS 398, 2028Google Scholar