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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20170629T103000
DTEND;TZID=Atlantic/Canary:20170629T113000
UID:iactalks-1019
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1019
CREATED:2017-06-29T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The Basis for Cosmic Ray Feedback: Written on the Wind
DESCRIPTION:The Basis for Cosmic Ray Feedback: Written on the Wind\nProf. E
 llen Zweibel\n\nStar formation and supermassive black hole growth in galax
 ies appear to be self limiting. The mechanisms for self regulation are kno
 wn as /feedback/. Cosmic rays, the relativistic particle component in
  interstellar and intergalactic plasma, are among the agents of feedback. 
 Because cosmic rays are virtually collisionless in the plasma environments
  of interest, their interaction with the ambient medium is primarily media
 ted by large scale magnetic fields and kinetic scale plasma waves. Because
  kinetic scales are much smaller than global scales, this interaction is m
 ost conveniently described by fluid models. In this paper I discuss the ki
 netic theory and the classical theory of cosmic ray hydrodynamics (CCRH) w
 hich follows from assuming cosmic rays interact only with self excited wav
 es. I generalize CCRH to generalized cosmic ray hydrodynamics (GCRH), whic
 h accommodates interactions with extrinsic turbulence, present examples of
  cosmic ray feedback in galaxies and galaxy clusters, and assess where pro
 gress is needed.
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