Vallée, J.P. (2022) The Observed Age Gradient in the Milky Way—As a Test for Theories of Spiral Arm Structure. Astrophysics and Space Science, 367, Article No. 26.
https://doi.org/10.1007/s10509-022-04057-2

has been cited by the following article:

• TITLE: Kinematic Structure of the Milky Way Galaxy, Near the Spiral Arm Tangents

  AUTHORS: Jacques P. Vallée

  KEYWORDS: Astrophysics, Galaxy, Milky Way, Spiral Arms, Symmetries

  JOURNAL NAME: International Journal of Astronomy and Astrophysics, Vol.12 No.4, December 29, 2022

  ABSTRACT: We compare the observed radial velocity of different arm tracers, taken near the tangent to a spiral arm. A slight difference is predicted by the density wave theory, given the shock predicted at the entrance to the inner spiral arm. In many of these spiral arms, the observed velocity offset confirms the prediction of the density wave theory (with a separation between the maser velocity and the CO gas peak velocity, of about 20 km/s)—when the observed offset is bigger than the error estimates.