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Elliptical vs Spiral. NGC 4649. NGC 4649. Visible. Far-UV . (2500 A) . (1500 A) . "UV UPTURN ". T e ~ 20000 K. "UV UPTURN ". "Burstein Relation" . (SAURON sample ETGs, GALEX). (IUE). bluer. Bureau et al., MNRAS, 414, 1887, 2011. Minimum T e for FUV output. Post AGB. .
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Elliptical vs Spiral NGC 4649 NGC 4649 Visible Far-UV
(2500 A) (1500 A)
Te ~ 20000 K "UV UPTURN"
"Burstein Relation" (SAURON sample ETGs, GALEX) (IUE) bluer Bureau et al., MNRAS, 414, 1887, 2011
Post AGB . Post EHB .
Omega Centauri – FUV CMD EHB and Post-EHB Omega Centauri FUV Image (UIT)
UV-Optical Colors in Coma ClusterColors vs Velocity Dispersion bluer Smith et al., MNRAS, 421, 2982, 2012
UV-Optical Colors in Coma ClusterColors vs Age & Metallicity bluer Smith et al., MNRAS, 421, 2982, 2012
"Residual Star Formation" (0.1-1 Gyr) in ETG's:Intermediate-Age Populations
Distinguishing RSF from UV-Upturn in ETG's (Kaviraj 2007) Strongest UV-upturn At least 30% of ETGs exhibit RSF UV colors
UV CMD for M32 (Brown, et al. 2008) ~ No PAGB stars Few P-EHB stars EHB
Simulation: [Fe/H] = -0.25, Y = normal Bimodal HB, 2% in EHB Small scatter in extinction Brown et al. 2008
Post AGB . Post EHB .
* } } ☉ H H P P ☉ m g Ṁ Ṁ Arial 24 Map: U-I color Contours: Radio Feedback GillSansMT-bold Helv24 Shadowed helvetica calibri
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