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Star Formation Dark Matter and Baryons Gravity (DM) defines large - PowerPoint PPT Presentation

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Star Formation Dark Matter and Baryons Gravity (DM) defines large scale structure of the Universe Baryons are mostly hitchhiking a ride Yet, their physical interactions are far richer Gastrophysics How are stars

  1. Star Formation

  2. Dark Matter and Baryons ★ Gravity (DM) defines large scale structure of the Universe ★ Baryons are mostly hitchhiking a ride ★ Yet, their physical interactions are far richer ★ “Gastrophysics” ★ How are stars formed? KAS16/MT Lecture1II - Star Formation 2

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  18. ★ Gas in the Interstellar Medium is not dense enough KAS16/MT Lecture1II - Star Formation 18

  19. Radiative cooling ★ How do you expect cooling to depend on metallicity of gas? KAS16/MT Lecture1II - Star Formation 19

  20. Radiative cooling and “metals” ★ The more “metals” the more efficient the cooling: many energy levels available ★ Simple atoms and molecules are inefficient at radiative cooling ★ Metal-free gas (Z<10 -3.5 Z Sun ) hard to cool ★ What is your expectation for the Jeans mass in first gas clouds? KAS16/MT Lecture1II - Star Formation 20

  21. Log{Cooling efficiency} ★ But cooling efficiency grows with temperature KAS16/MT Lecture1II - Star Formation 21

  22. Log{Cooling efficiency} ★ But cooling efficiency grows with temperature ★ WHY? KAS16/MT Lecture1II - Star Formation 22

  23. DM halos and cooling of gas ★ Temperature of gas in DM halos depends on halo mass and redshift ★ There is a minimum halo mass for which cooling is efficient (cooling time less than Hubble time) KAS16/MT Lecture1II - Star Formation 23

  24. Minimum halo for cooling T vir =1e4K M cool minimum halo mass for cooling z Trenti & Stiavelli (2009) KAS16/MT Lecture1II - Star Formation 24

  25. The simple picture Gas cloud starts to contract It gets smaller and denser And smaller... Denser, Hotter until H-fusion begins: A star is born! KAS16/MT Lecture1II - Star Formation 25

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  30. T [K] n [cm -3 ] Smith et al. (2009) KAS16/MT Lecture1II - Star Formation 30

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