A New Method of the Corotation Radius Evaluation in our Galaxy

Details A New Method of the Corotation Radius Evaluation in our Galaxy A New Method of the Corotation Radius Evaluation in our Galaxy

2011-04-21

arxiv.org/abs/1104.4221v1

MNRAS Letters 2011

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

5 pages, 5 figure, 1 table

Scientific paper

We propose a new method for determination of the rotation velocity of the galactic spiral density waves, correspondingly, the corotation radius, $r_C$, in our Galaxy by means of statistical analysis of radial oxygen distribution in the galactic disc derived over Cepheids. The corotation resonance happens to be located at $r_C \sim 7.0 - 7.6 $ kpc, depending on the rate of gas infall on to the galactic disc, the statistical error being $\sim 0.3 - 0.4$ kpc. Simultaneously, the constant for the rate of oxygen synthesis in the galactic disc was determined. We also argue in favour of a very short time-scale formation of the galactic disc, namely: $t_f \sim 2$ Gyr. This scenario enables to solve the problem of the lack of intergalactic gas infall.

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