The corotation gap in the Galactic H i distribution

We used the H i data from the LAB Survey to map the ring-shaped gap in H i density that lies slightly outside the solar circle. Adopting R0= 7.5 kpc, we find an average gap radius of 8.3 kpc and an average gap width of 0.8 kpc. The characteristics of the H i gap correspond closely to the expected on...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2009-12, Vol.400 (4), p.1768-1774
Main Authors: Amôres, E. B., Lépine, J. R. D., Mishurov, Yu. N.
Format: Article
Language:English
Subjects:
Astrophysics
galaxies: spiral
Galaxy: disc
Galaxy: general
Galaxy: kinematics and dynamics
Galaxy: structure
Kinematics
Stars & galaxies
Online Access:Get full text
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Summary:We used the H i data from the LAB Survey to map the ring-shaped gap in H i density that lies slightly outside the solar circle. Adopting R0= 7.5 kpc, we find an average gap radius of 8.3 kpc and an average gap width of 0.8 kpc. The characteristics of the H i gap correspond closely to the expected ones, as predicted by theory and by numerical simulations of the gas flow near the corotation resonance.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2009.15611.x