A New Method of the Corotation Radius Evaluation in our Galaxy

Abstract

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.

5 pages, 5 figure, 1 table

References in corpus (4)

• Cold gas accretion in galaxies
• Chemical Evolution Models for Spiral Disks: the Milky Way, M31 and M33
• Breaks in the Radial Oxygen Abundance and Corotation Radius of Three Spiral Galaxies
• The Disk-Halo Connection and Where Has All The Gas Gone?

Cited by in corpus (4)

• Galactic spiral patterns and dynamo action I: A new twist on magnetic arms
• Radial Migration of the Sun in the Milky Way: a Statistical Study
• Investigation of the Prompt SNe Ia progenitor nature through the analysis of the chemical composition of globular clusters and circumgalactic clouds
• Local metallicity distribution function derived from Galactic large-scale radial iron pattern modelling