SIMBAD references

2009ApJ...706..471B - Astrophys. J., 706, 471-481 (2009/November-3)

The origin of large peculiar motions of star-forming regions and spiral structures of our galaxy.

BABA J., ASAKI Y., MAKINO J., MIYOSHI M., SAITOH T.R. and WADA K.

Abstract (from CDS):

Recent Very Long Baseline Interferometer (VLBI) observations determined the distances and proper motions of star-forming regions in spiral arms directly. They showed that star-forming regions and young stars have large peculiar motions as large as 30 km/s with complex structures. Such a large peculiar motion is incompatible with the prediction of the standard theory of quasi-stationary spiral arms. We use a high-resolution, self-consistent N-body+hydrodynamical simulation to explore how the spiral arms are formed and maintained, and how star-forming regions move. We found that arms are not quasi-stationary but transient and recurrent, as suggested in alternative theories of spiral structures. Because of this transient nature of the spiral arms, star-forming regions exhibit a trend of large and complex non-circular motions, which is qualitatively consistent with the VLBI observations. Owing to this large non-circular motion, a kinematically estimated gas map of our Galaxy has large systematic errors of ∼2-3 kpc in the distance from the Sun.

Abstract Copyright:

Journal keyword(s): galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure - Galaxy: kinematics and dynamics - Galaxy: structure - ISM: kinematics and dynamics - ISM: structure - masers - methods: numerical

Simbad objects: 25

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2019.12.13-15:02:13

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