Large-scale Hydrodynamical Shocks as the Smoking-gun Evidence for a Bar in M31

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dc.contributor.authorFeng, Zi-Xuan
dc.contributor.authorLi, Zhi
dc.contributor.authorShen, Juntai
dc.contributor.authorGerhard, Ortwin
dc.contributor.authorSaglia, R. P.
dc.contributor.authorBlana, Matias
dc.date.accessioned2025-01-20T21:04:16Z
dc.date.available2025-01-20T21:04:16Z
dc.date.issued2022
dc.description.abstractThe formation and evolutionary history of M31 are closely related to its dynamical structures, which remain unclear due to its high inclination. Gas kinematics could provide crucial evidence for the existence of a rotating bar in M31. Using the position-velocity diagram of [O III] and H I, we are able to identify clear sharp velocity jump (shock) features with a typical amplitude over 100 km s(-1) in the central region of M31 (4.6 kpc x 2.3 kpc, or 20' x 10'). We also simulate gas morphology and kinematics in barred M31 potentials and find that the bar-induced shocks can produce velocity jumps similar to those in [O III]. The identified shock features in both [O III] and H I are broadly consistent, and they are found mainly on the leading sides of the bar/bulge, following a hallmark pattern expected from 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 coverage on the near side, as well as to obscuration by the warped gas and dust layers. Further hydrodynamical simulations with more sophisticated physics are desired to fully understand the observed gas features and to better constrain the parameters of the bar in M31.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ac7964
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ac7964
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93227
dc.identifier.wosidWOS:000827247200001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleLarge-scale Hydrodynamical Shocks as the Smoking-gun Evidence for a Bar in M31
dc.typeartículo
dc.volumen933
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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