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SUMMARY:Low-mass galaxy rotation curves that fail as dynamical mass tracer
 s
DTSTART;VALUE=DATE-TIME:20230323T142800Z
DTEND;VALUE=DATE-TIME:20230323T143000Z
DTSTAMP;VALUE=DATE-TIME:20241114T092452Z
UID:indico-contribution-277@meetings.aip.de
DESCRIPTION:Speakers: Kyle Oman (Durham University)\nIt is routinely assum
 ed that galaxy rotation curves are equal to their circular velocity curves
  (modulo some corrections) such that they are good dynamical mass tracers.
  I will present the results of an unconventional\, visualisation-driven an
 alysis of 33 low-mass field galaxies from the APOSTLE suite of galaxy form
 ation simulations exploring the limits of the validity of this assumption.
  Only 4/33 galaxies have HI rotation curves nearly equal to their circular
  velocity curves\; the rest are undergoing a wide variety of dynamical per
 turbations of both secular and environmental origin. While some types of p
 erturbations\, such as ongoing mergers\, have obvious observable signature
 s\, others\, such as wind from motion through the intergalactic medium\, a
 re much more subtle. Discrepancies between the rotation curves and circula
 r velocity curves of low-mass galaxies have direct consequences for key re
 sults in near-field cosmology. They likely lead to an overestimation of th
 e low-velocity end of the baryonic Tully-Fisher relation that is difficult
  to avoid (even by attempting to select 'equilibrium' galaxies)\, and coul
 d plausibly be the source of a significant portion of the observed diversi
 ty in low-mass galaxy rotation curve shapes.\n\nhttps://iaus379.aip.de/eve
 nt/20/contributions/277/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/277/
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