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SUMMARY:Halpha filaments in Massive Ellipticals: the roles played by Turbu
 lence and type Ia Supernovae - Rajsekhar Mohapatra (Princeton)
DTSTART:20240510T103000Z
DTEND:20240510T113000Z
UID:TALK215983@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:Massive elliptical galaxies are often quiescent in star format
 ion\, despite hosting large amounts of -10 million K gas in their ISM\, wh
 ich can cool in a few 100 Myr and fuel star formation. Many of these ellip
 tical galaxies also host massive kpc-scale filaments of cooler atomic (10^
 4 K) and molecular gas (~10 K) which coexist with the hot ISM.\n\nTwo of t
 he outstanding problems related to these systems are - (1) when and how do
  these cold filaments form? and (2) what keeps the rest of the ISM of the 
 elliptical galaxies hot?\n\nIn the first part of this presentation\, I wil
 l discuss the results of our latest local patch simulations with gravity\,
  turbulence\, and radiative cooling physics included. I will present a new
  condensation criterion to form cold gas from the hot ISM\, which takes th
 e effect of turbulence\, cooling\, and buoyancy into account. (https://arx
 iv.org/abs/2302.09380)\n\nIn the inner few kilo-parsecs (kpc) of the ellip
 tical galaxies\, the net heating due to type 1a supernovae (SNIa) is compa
 rable to the net radiative cooling rate and can help maintain the ISM hot.
  In the second part of the talk\, I will present the results from our 1 kp
 c ISM-patch simulations with individually resolved type SNIa bubbles. I wi
 ll discuss how these SNIa heat the ISM and drive turbulence in it. Finally
 \, I will compare our results against more commonly implemented smooth hea
 ting models in previous theoretical studies. (arxiv: https://arxiv.org/abs
 /2402.03613)\n\n
LOCATION:Ryle seminar room + online
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