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Does AGN feedback trigger star formation?

Does AGN feedback trigger star formation?. Saiyu Hou Group Meeting, 12/17/2013. AGN model. Accretion disk. Central SMBH. Relation between SMBH & Galaxy. Gebhardt et al. APJ 2000. A.C. Fabian Observational Evidence of AGN Feedback ARA&A 2012. AGN feedback. Kinetic mode

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Does AGN feedback trigger star formation?

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  1. Does AGN feedback trigger star formation? SaiyuHou Group Meeting, 12/17/2013

  2. AGN model Accretion disk Central SMBH

  3. Relation between SMBH & Galaxy Gebhardt et al. APJ 2000

  4. A.C. Fabian Observational Evidence of AGN Feedback ARA&A 2012

  5. AGN feedback Kinetic mode (radio mode) Push gas out Radiative mode (quasar/wind mode) heating

  6. AGN feedback Kinetic mode (radio mode) Push gas out Radiative mode (quasar/wind mode) heating https://gandc.oca.eu/IMG/pdf/Rocca_Starburst_AGN.pdf

  7. Star Formation molecular clouds Gas pressure unable to support gravitational collapse

  8. Jeans Mass http://burro.cwru.edu/Academics/Astr221/LifeCycle/jeans.html

  9. So … AGN feedback suppress star formation? Photo excitation/photoionization Compton heating T Blown away by radiation pressure and ram pressure of mass outflow Thus limiting Star formation …

  10. Another possibility … AGN feedback trigger star formation !

  11. Analytical work of Ishibashi & Fabian MNRAS 2012

  12. Mechanism • radiationpressure on dust • a shellof dustygas swept outwards • feedback driven shell

  13. Mechanism

  14. Equation of emotion of the shell

  15. Dark matter density profile DM mass enclosed Mass of gas Radius of the shell Velocity of the shell

  16. Critical Luminosity considering the equilibrium between outward radiation pressure and inward gravitational forces

  17. L~1.01 Lc L~0.95 Lc L~0.9 Lc

  18. L ~ 2Lc

  19. http://en.wikipedia.org/wiki/Eddington_luminosity

  20. Dark matter density profile Isothermal sphere http://en.wikipedia.org/wiki/Singular_isothermal_sphere_profile Hernquistprofile HernquistAPJ 1990 & http://www.astro.utu.fi/~cflynn/galdyn/lecture4.html NFW profile http://en.wikipedia.org/wiki/NFW_profile

  21. Mechanism

  22. ?

  23. Simulation work of Chao Liu et al. APJ 2013

  24. simulation • grid-based hydrodynamic (HD) simulations • in-cludeboth mass outflow and radiative feedback • Radiation heating/cooling included

  25. More Observationneeded!

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