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Exploration of Galactic Structures beyond the Sun toward the anti-center of the Milky Way

Published online by Cambridge University Press:  06 January 2014

Yan Xu
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, BeijingChina email: xuyan.jade@gmail.com
Heidi Newberg
Affiliation:
Rensselaer Polytechnic Institute, USA email: newbeh@rpi.edu
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Abstract

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We map the stellar distribution on Hess diagram in the Anti-Center roughly in the boxes 130<l<230, −30<b<−10 and 10<b<30. There are ‘extra components’ associated with the anti-center structures of figure 1 of Newberg et al. (2002). The turnoff point of the structure in the North sky is at 16m.5 and the turnoff point in the South is at 17m.5. In our work, these structures can be found in all of the longitude in our box that can't be explained by standard thin or thick disk models. The distance of the North structure is about 2 kpc (we call it the North near structure) and the galactic height is about 0.7 kpc, the distance of the South structure is about 4 – 6 kpc (we call it the South middle structure). The Vgsr distribution of stars selected along the North near structure has a kinematic distribution similar to that of thick disk stars. But the metallicities of these stars are quite similar to the metallicity distribution of thin disk stars. We try to explain these structures with wave structure of the Galactic plane.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

References

Newberg, H., Yanny, B., Rockosi, C.et al. 2002, APJ, 569, 249CrossRefGoogle Scholar