The Milky Way Revealed by Gaia: The Next Frontier

Session

WG1: The Milky Way as a Galaxy (I). Chair: Teresa Antoja

6 Sept 2023, 14:15

University of Barcelona (Institute of Cosmos Sciences (ICCUB-IEEC))

110. Report WG1: The Milky Way as a Galaxy

Despina Hatzidimitriou

06/09/2023, 14:15

97. Chemodynamical models of the Milky Way (invited talk)

Eugene Vasiliev

06/09/2023, 14:25

Invited talk

I present a framework for constructing self-consistent dynamical models of our Galaxy described by distribution functions in action space, and its extension to the chemical space (metallicity and alpha). The models are fitted to the data from Gaia DR3 and APOGEE DR17, and contain several disc components with varying chemodynamical properties, as well as the stellar and dark haloes. The models...

28. Possible confirmation of the spiral density-wave structure in the solar neighborhood using about 650000 Gaia EDR3 stars

Evgeny Griv (Ben-Gurion University)

06/09/2023, 14:55

Contributed talk

More than fifty years ago, Lin & Shu (1964), Lin & Shu (1966), Lin et al. (1969), and Shu (1970), published their basic, asymptotic theory of spiral sound-like density waves (or a `breathing mode of collective oscillations'), developing in the disk of a rotationally flattened galaxy, by solving both gas-dynamic and Vlasov-Poisson equations for a 2D mass distribution. The theoretical concept of...

36. Spiral-like features in the disc revealed by Gaia DR3 radial actions

Pedro Alonso Palicio (Observatoire de la Côte d'Azur)

06/09/2023, 15:10

Contributed talk

The so-called action variables are specific functions of the positions and velocities that remain constant along the stellar orbit. The astrometry provided by Gaia Early Data Release 3 (EDR3), combined with the velocities inferred from the Radial Velocity Spectrograph (RVS) spectra of Gaia DR3, allows for the estimation of the actions and orbital parameters for the largest volume of stars to...

47. Radial Wave in the Galactic Disk: New Clues to discriminate different Perturbations

Chengye Cao (Shanghai Jiao Tong University)

06/09/2023, 15:25

Contributed talk

Decoding the key dynamical processes that shape the Galactic disk structure is crucial for reconstructing the Milky Way's evolution history. The second Gaia data release uncovers a new wave pattern in the L_Z-V_R space accompanied by a richness of phase space substructures, signifying the Galactic disk in dynamical disequilibrium. However, its formation mechanism remains elusive due to the...