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SUMMARY:On the baryon-driven contraction of dark matter halos
DTSTART;VALUE=DATE-TIME:20230324T084000Z
DTEND;VALUE=DATE-TIME:20230324T085500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115756Z
UID:indico-contribution-213@meetings.aip.de
DESCRIPTION:Speakers: Pengfei Li (Leibniz-Institute for Astrophysics at Po
 tsdam)\nThe gravitational interaction between dark matter (DM) and baryons
  has long been ignored when building galaxies semi-empirically and observa
 tionally. In this talk\, I will show that the baryonic gravity leads to an
  adiabatic contraction of DM halos\, ignoring which would result in the bu
 ilt galaxies that are not in a dynamic equilibrium and hence cannot exist 
 in reality. We propose a new approach to fitting galaxy rotation curves by
  numerically calculating the contraction of DM halos. We find adiabatic co
 ntraction makes DM halos more cuspy for massive galaxies\, so that their r
 otation curves cannot be fit without systematically reducing baryonic cont
 ributions. We also examine the baryonic effect on the predicted radial acc
 eleration relation of cold DM model\, and find the predicted relations of 
 massive galaxies are systematically higher than observed. Both tensions po
 int to a core-cusp problem\, a classical problem for dwarf galaxies but pe
 rsisting in massive galaxies as well due to strong adiabatic contraction. 
 In order to reconcile this problem\, feedback must work in massive galaxie
 s as efficiently as in dwarf galaxies.\n\nhttps://meetings.aip.de/event/20
 /contributions/213/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/213/
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