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Evidence of the Galactic outer ring \(R_{1}R_{2}'\) from young open clusters and OB-associations

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Abstract

The distribution of young open clusters in the Galactic plane within 3 kpc from the Sun suggests the existence of the outer ring \(R_{1}R_{2}'\) in the Galaxy. The optimum value of the solar position angle with respect to the major axis of the bar, \(\theta_{\mathrm{b}}\), providing the best agreement between the distribution of open clusters and model particles is \(\theta_{\mathrm{b}}=35\pm10^{\circ}\). The kinematical features obtained for young open clusters and OB-associations with negative Galactocentric radial velocity \(V_{R}\) indicate the solar location near the descending segment of the outer ring \(R_{2}\).

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Acknowledgements

We thank H. Salo for sharing his N-body code. We are grateful to O.K. Sil’chenko and A.S. Rastorguev for useful discussion. This work was supported in part by the Russian Foundation for Basic Research (project no 13-02-00203, 14-02-00472), and the joint grant by the Russian Foundation for Basic Research and Department of Science and Technology of India (project no. RFBR 15-52-45121—INT/RUS/RFBR/P-219). Analysis of open cluster data was supported by Russian Scientific Foundation grant no. 14-22-00041.

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Correspondence to A. M. Mel’nik.

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Mel’nik, A.M., Rautiainen, P., Glushkova, E.V. et al. Evidence of the Galactic outer ring \(R_{1}R_{2}'\) from young open clusters and OB-associations. Astrophys Space Sci 361, 60 (2016). https://doi.org/10.1007/s10509-016-2656-9

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  • DOI: https://doi.org/10.1007/s10509-016-2656-9

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