The HI-H 2 Transition and Star Formation in Early-Type Galaxies

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Σtot, ΣH2, ΣHI Versus Radius RCO 15” RCO 7” Green: HI surface density Black: H2 surface density Orange: HI+H2 surface density • ΣHI does not saturate above 9-10 M⨀ pc -2 for any of the sample galaxies. RCO 15” RCO 15” • ΣHI saturation occurs near RCO except for NGC 3032. • NGC 4150 has extremely low ΣHI throughout. RCO 15” 50” • Field E’s (NGC 807, UGC 1503) saturate at ~5 M⨀ pc -2 whereas the field S0’s (NGC 3032, NGC 3656, NGC 5666) saturate at ~9-10 M⨀ pc -2 . RCO Morphological correlation or resolution effects?. 8
Σcrit Versus Σtot
Page 1 and 2: The giant elliptical galaxy ESO 325
Page 3 and 4: Motivation It is well known that m
Page 5 and 6: Results NGC 807 Five Detections: N
Page 7: HI detected HI non-detected UGC 150
Page 11 and 12: Rmol-Pressure Relation Recall that
Page 13 and 14: Blitz & Rosolowsky 2006; Leroy et a
Page 15 and 16: ρs is constant over Hg? s>>Hg H Ko
Page 17 and 18: ρs is constant over Hg? s>>Hg H Az
Page 19 and 20: ρ s Constant with H g ? The MGE st
Page 21 and 22: Koyama & Ostriker 2008 ----> Hg: 5-
Page 23 and 24: Koyama & Ostriker 2008 ----> 23 Gas
Page 25 and 26: Rmol-Pressure Relation •Early-typ
Page 27 and 28: Summary • Observed HI surface den

The HI-H 2 Transition and Star Formation in Early-Type Galaxies

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