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SUMMARY:The role of halo formation history and circumgalactic gas expulsio
 n in the evolution of  galaxies - Rob Crain (LJMU)
DTSTART:20191114T160000Z
DTEND:20191114T170000Z
UID:TALK132088@talks.cam.ac.uk
CONTACT:28811
DESCRIPTION:Modern galaxy formation models posit that the growth of massiv
 e galaxies\nis regulated\, and even quenched\, by energy liberated as gas 
 accretes\nonto supermassive black holes (SMBHs) at their centres. I will d
 iscuss\nanalyses of cosmological simulations from the EAGLE and IllustrisT
 NG\nprojects\, which adopt differing assumptions about\, and implementatio
 ns\nof\, the coupling of this energy to interstellar gas. The simulations\
 nconcur that a fundamental (but largely overlooked) step in the quenching\
 nprocess is the ejection of gas from the circumgalactic medium (CGM)\, the
 \nreservoir of diffuse\, multiphase gas that envelops galaxies. They also\
 nconcur that this process is more efficient in early-forming dark matter\n
 haloes (at fixed halo mass)\, despite their gas being more tightly-bound\,
 \nowing to the earlier growth of the SMBH. However\, the differing\nassump
 tions yield divergent scaling relations connecting the properties\nof SMBH
 s and the CGM\, potentially affording an effective route to\nconstrain the
  influence of SMBHs on the evolution of their host.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
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