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SUMMARY:Galaxy masses derived from the timing argument
DTSTART;VALUE=DATE-TIME:20230321T114000Z
DTEND;VALUE=DATE-TIME:20230321T120500Z
DTSTAMP;VALUE=DATE-TIME:20241114T092422Z
UID:indico-contribution-180@meetings.aip.de
DESCRIPTION:Speakers: Jorge Peñarrubia (University of Edinburgh)\nThe rat
 her intuitive concept of 'galaxy mass' is an ill-defined quantity in cosmo
 logy. First\, because in an expanding\, close-to-homogeneous Universe coll
 apsed structures do not show well-defined boundaries\, and second because 
 the availability of dynamical tracers becomes very scarce in the outskirts
  of dark matter haloes. In this talk I will provide an overview of the tim
 ing argument\, which models the relative motion of massive substructures i
 n an expanding Universe as a restricted 3-body system. I will show that th
 is method returns masses that are systematically higher than the mass encl
 osed within the nominal virial radius of a galaxy\, thus complicating a di
 rect comparison with 'dynamical' masses derived from halo tracers. As an a
 pplication\, I will summarize recent attempts to measure simultaneously th
 e masses of our Galaxy\, the Large Magellanic Cloud and M31.\n\nhttps://ia
 us379.aip.de/event/20/contributions/180/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/180/
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