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SUMMARY:Large-scale Hydrodynamical Shocks as the Smoking-gun Evidence for 
 a Bar in M31
DTSTART;VALUE=DATE-TIME:20230321T121100Z
DTEND;VALUE=DATE-TIME:20230321T121300Z
DTSTAMP;VALUE=DATE-TIME:20240704T115728Z
UID:indico-contribution-252@meetings.aip.de
DESCRIPTION:Speakers: Zixuan Feng (Shanghai Astronomical Observatory)\nThe
  formation and evolutionary history of M31 are closely related to its dyna
 mical structures\, which remain unclear due to its high inclination. Gas k
 inematics could provide crucial evidence for the existence of a rotating b
 ar in M31. Using the position–velocity diagram of [O III] and H I\, we a
 re able to identify clear sharp velocity jump (shock) features with a typi
 cal amplitude over 100 km/s in the central region of M31 (4.6 kpc × 2.3 k
 pc\, or 20' x 10'). We also simulate gas morphology and kinematics in barr
 ed M31 potentials and find that the bar- induced shocks can produce veloci
 ty jumps similar to those in [O III]. The identified shock features in bot
 h [O III] and H I are broadly consistent\, and they are found mainly on th
 e leading sides of the bar/bulge\, following a hallmark pattern expected f
 rom the bar-driven gas inflow. Shock features on the far side of the disk 
 are clearer than those on the near side\, possibly due to limited data cov
 erage on the near side\, as well as to obscuration by the warped gas and d
 ust layers. Further hydrodynamical simulations with more sophisticated phy
 sics are desired to fully understand the observed gas features and to bett
 er constrain the parameters of the bar in M31.\n\nhttps://meetings.aip.de/
 event/20/contributions/252/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/252/
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