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On the claimed X-shaped structure in the Milky Way bulge

Published online by Cambridge University Press:  02 August 2018

Daniel Han  and
Young-Wook Lee
Daniel Han
Affiliation:
Center for Galaxy Evolution Research & Department of Astronomy, Yonsei University, Seoul 03722, Republic of Korea email: daniel.han@yonsei.ac.kr, ywlee2@yonsei.ac.kr
Young-Wook Lee
Affiliation:
Center for Galaxy Evolution Research & Department of Astronomy, Yonsei University, Seoul 03722, Republic of Korea email: daniel.han@yonsei.ac.kr, ywlee2@yonsei.ac.kr
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Abstract

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A number of recent studies have claimed that the double red clump observed in the Milky Way bulge is a consequence of an X-shaped structure. In particular, Ness & Lang (2016) report a direct detection of a faint X-shaped structure in the bulge from the residual map of the Wide-Field Infrared Survey Explorer (WISE) image. Here we show, however, that their result is seriously affected by a bulge model subtracted from the original image. When a boxy bulge model is subtracted, instead of a simple exponential bulge model as has been done by Ness & Lang, we find that most of the X-shaped structure in the residuals disappears. Furthermore, even if real, the stellar density in the claimed X-shaped structure is way too low to be observed as a strong double red clump (dRC) at l = 0°.

Keywords

Galaxy: bulge - Galaxy: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 263 - 264
Copyright
Copyright © International Astronomical Union 2018 

References

Dwek, E., Arendt, R. G., Hauser, M. G., et al. 1995, ApJ, 445, 716Google Scholar
Joo, S.-J., Lee, Y.-W., & Chung, C., 2017, ApJ, 840, 98Google Scholar
Lee, Y.-W., Joo, S.-J., & Chung, C., 2015, MNRAS, 453, 3906Google Scholar
López-Corredoira, M., Cabrera-Lavers, A., & Gerhard, O. E., 2005, A&A, 439, 107Google Scholar
Ness, M. & Lang, D., 2016, AJ, 152, 14Google Scholar
Schelgel, D. J., Finkbeiner, D. P., & Davis, M., 1998, ApJ, 500, 525Google Scholar
Yuan, H. B., Liu, X. W., & Xiang, M. S., 2013, MNRAS, 430, 2188Google Scholar
Zoccali, M., Vasquez, S., Gonzalez, O. A., et al. 2017, A&A, 599, A12Google Scholar