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

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NGC 5666 NGC 807 NGC 3656 peak HI surface density is 9.1x10 20 cm −2 peak HI surface density is 7.7x10 20 cm −2 peak HI surface density is 7.2x10 21 cm −2 Morganti et al. 2006 NGC 3032 NGC 4150 UGC 1503 peak HI surface density is 2.9x10 19 cm −2 Peak HI surface density is 1.3x10 21 cm −2 peak HI surface density is 9.9x10 20 cm −2 6
HI detected HI non-detected UGC 1503 NGC 4476 NGC 5666 NGC 4526 NGC 3032 Young, Bendo, Lucero NGC 4459 7
Page 1 and 2: The giant elliptical galaxy ESO 325
Page 3 and 4: Motivation It is well known that m
Page 5: Results NGC 807 Five Detections: N
Page 9 and 10: Σcrit Versus Σtot
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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