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SUMMARY:Revisiting mass estimates of the Milky Way\, of M31\, and of some 
 spiral galaxies
DTSTART;VALUE=DATE-TIME:20230321T120900Z
DTEND;VALUE=DATE-TIME:20230321T121100Z
DTSTAMP;VALUE=DATE-TIME:20240704T115728Z
UID:indico-contribution-248@meetings.aip.de
DESCRIPTION:Speakers: Yongjun JIAO (Paris Observatory)\nWe estimate that t
 he mass of the Milky Way (MW) is in the range of 2 to 15 $\\times 10^{11} 
 M_\\odot$. It results from an analysis of the rotation curve (RC) from Gai
 a DR2 and using different profiles for baryon and dark matter (DM\, includ
 ing NFW & Einasto profile). The lower limit 2 $\\times 10^{11} M_\\odot$ c
 orresponds to the Keplerian slope of RC at large radii. There were no majo
 r mergers in the MW since 9 $\\sim$10 Gyr ago and then the dynamical mass 
 is well established from its RC. \n\nHowever\, most distant galaxies have 
 been found in the process of merging\, which perturbs the motion of stars 
 and gas. Thus it is essential to determine if the galaxy outskirts could b
 e at equilibrium after the merger epoch. Using a library of the simulation
 s of galaxy major-merger (including M31)\, we will study the criteria for 
 determining the relaxation of galactic disks. We will apply these criteria
  to the nearby spiral galaxies and determine the relaxation time scale and
  radius. Then we can measure robust dynamical masses within a given radius
 .\n\nhttps://meetings.aip.de/event/20/contributions/248/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/248/
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