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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20171018T123000
DTEND;TZID=Atlantic/Canary:20171018T133000
UID:iactalks-1077
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1077
CREATED:2017-10-18T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:AGN feedback from Mpc to pc scale: radio-mode, quasar-mode and back
 flows
DESCRIPTION:AGN feedback from Mpc to pc scale: radio-mode, quasar-mode and 
 backflows\nDr. Salvatore Cielo\n\nMechanical feedback by jets from Active 
 Galactic Nucei (AGN) is a  key process in galaxies and galaxy clusters: th
 e energy input from the  jets (in literature often addressed as radio-mode
  feedback) is crucial  in determining the properties of the hot gas (espec
 ially in cool-core  galaxy clusters), as well as inflating the large cavit
 ies we observe in  the X-ray gas. The interaction of AGN outflows (both je
 ts and radiation)  with cold gas in galactic environment  (quasar-mod
 e feedback) can  instead impact the cosmic star formation rate, as well as
  power  galaxy-wide atomic and molecular outflows. Finally, AGN can affect
  its  own proximity, regulating central gas accretion and giving rise to  
 (sometimes) self-sustained feeding/feedback cycles.I  will follow the inte
 raction of AGN with intergalactic and interstellar  gas from large to smal
 l scales (radio-mode) with the use of numerical  simulations. As radio-mod
 e feedback, I will discuss the properties and  the energetics​ of the ho
 t gas bubbles inflated by multiple jet events  in a galaxy ​cluster, wit
 h the aid of synthetic but realistic X-ray  observations. On galactic scal
 es, I will discuss the  mechanical coupling of jets and radiation with a c
 lumpy galactic disc,  show how AGN can trigger dense and fast outflows, an
 d briefly describe  the impact on galactic star formation.\nI will finally
   discuss "backflows" --- i.e. galaxy-wide gas circulation patterns that  
 "flow back" to the circum-nuclear region --- as a mechanism for AGN  self-
 regulation. I will show, complementing the simulations with a  small-scale
  analytical model, how backflows are able to convey large  amounts of cold
  gas to the central region, that can boost the AGN power  by even a factor
  of ten.
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