BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:0 UID:UW-Physics-Event-4181 DTSTART:20160512T203000Z DTEND:20160512T220000Z DTSTAMP:20260419T075747Z LAST-MODIFIED:20160505T124548Z LOCATION:4421 Sterling Hall\, Coffee and Cookies 3:30 PM\, Talk at 3:4 5 PM SUMMARY:The role of cosmic rays in stellar and supermassive black hole feedback\, Astronomy Colloquium\, Mateusz Ruszkowski\, University of Michigan\, Department of Astronomy DESCRIPTION:I will discuss the role of cosmic rays in stellar and supe rmassive black hole feedback. I will argue that cosmic rays are likely to play a very important role across a large range of distance scales -- from the scales of individual galaxies to the scales comparable to those of cool cores of galaxy clusters. Regarding the galactic scale feedback\, I will focus on supernova and cosmic ray driven winds but w ill also briefly discuss black hole feedback model for the Fermi bubbl es. Galactic outflows play an important role in galaxy evolution and\, despite their importance\, a detailed understanding of the physical m echanisms responsible for the driving of these winds is lacking. Altho ugh cosmic rays comprise only a tiny fraction of interstellar particle s by number\, they carry energy comparable to that in the thermal gas. I will describe a suite of global 3D MHD numerical simulations that f ocus on the dynamical role of cosmic rays injected by supernovae\, and specifically on the impact of cosmic ray streaming along the magnetic fields. Our results show that this microphysical effect can have a si gnificant impact on the wind launching depending on the details of the plasma physics. Regarding the feedback on galaxy cluster scales\, I w ill briefly discuss preliminary results from our simulations of black hole jets in cool cores of galaxy clusters including the effects of co smic rays. I will argue that cosmic ray heating of the intracluster me dium (ICM) may be an important heating mechanism both in the tenuous a nd cold phases of the ICM. While largely an unexplored territory in th e context of galactic winds and AGN feedback\, cosmic ray feedback is an important process facilitating launching and efficient driving of g alactic-scale winds in starburst galaxies and heating of the ICM and r emains the subject of intense research.
\n URL:https://www.physics.wisc.edu/events/?id=4181 END:VEVENT END:VCALENDAR