The Milky Way Revealed by Gaia: The Next Frontier

Session

WG1: The Milky Way as a Galaxy (III). Chair: Sonia Anton

7 Sept 2023, 09:00

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

48. Angular momentum of the Classical Cepheids and the spiral structure of the Milky Way

Marcin Semczuk (Institut de Ciències del Cosmos - Universitat de Barcelona)

07/09/2023, 09:00

Contributed talk

The classical Cepheids are variable stars with relatively young ages (<300 Myr). Their tight period-luminosity relation provides highly accurate distance estimates. By combining recent measurements of proper motions from Gaia EDR3, radial velocities from Gaia DR3, and Cepheid distances, it is possible to study the details of the phase space distribution of this population. In my talk, I will...

84. Structure, kinematics and time evolution of the Galactic Warp revealed by Classical Cepheids (online)

Mauro Cabrera (Facultad de Ciencias, Udelar)

07/09/2023, 09:15

Contributed talk

The warp is a well-known undulation of the Milky Way disc. Its structure has been widely studied, but only since Gaia DR2 has it been possible to reveal its kinematic signature beyond the solar neighbourhood. In this work we will present an analysis of the warp's structure by means of a Fourier decomposition in vertical high ($Z$) and vertical velocity ($V_z$) traced by Cepheids. We find a...

88. The Outer Arm of the Milky Way from red clump stars

Namita Uppal (Physical Research Laboratory, India)

07/09/2023, 09:30

Contributed talk

Understanding the structure and formation of our Milky Way galaxy is one of the key goals in the field of Galactic astronomy. The study of disk morphology provides valuable insights into the processes that have shaped our galaxy over time. While our location within the disc allows for detailed observations of stars, this position also limits our ability to gain a clearer view of its structure....

30. Beyond Gaia DR3: tracing the [α/M] − [M/H] bimodality from the Inner to the outer Milky Way disc with Gaia RVS and Convolutional Neural-Networks

Guillaume Guiglion

07/09/2023, 09:45

Contributed talk

Gaia DR3 provided the community with one million RVS spectra covering the CaII triplet region, similarly to the RAVE spectra. One third of the spectra have a signal-to-noise ratio from 15 to 25 per pixel. Gaia also provides XP spectra/coefficients in DR3. We aim to leverage versatility/capabilities of machine learning techniques for combining
the full set of Gaia products for supercharged...

40. Testing the Milky Way's age-metallicity-velocity dispersion relation and the low-mass star age-rotation-activity relation using white dwarf ages

Alberto Rebassa-Mansergas (Universitat Politècnica de Catalunya)

07/09/2023, 10:00

Contributed talk

Stellar ages are of utmost importance for understanding the chemical and dynamical evolution of the Milky (the so called age-metallicity and age-velocity dispersion relations, respectively) as well as to understand the physical properties of its stellar members (e.g. the age-rotation-activity relation of low-mass main sequence stars). However, estimating the ages of stars is a difficult...

72. The chemodynamical properties of the Galactic bulge

Xiaojie Liao (Shanghai Jiao Tong University)

07/09/2023, 10:15

Contributed talk

We present a chemodynamical analysis of a large sample across the whole disk selected from Gaia-XP-spectra-derived dataset. When dividing the sample into a subsequent of annuluses, a universal chemodynamical trend exists from the disk to the bulge in the row normalized density map in the azimuthal velocity $V_\phi$ and metallicity [M/H] space is found, that is, a V-shaped structure stacked...

29. Precise abundances of Mg and neutron-capture elements in the Milky Way: chemodynamical relations using Gaia data and chemical evolution models

Pablo Santos-Peral (Universidad Complutense de Madrid, Observatoire de la Côte d’Azur)

07/09/2023, 10:30

Contributed talk

The abundance of alpha and neutron-capture elements provide an important fossil signature in Galactic archaeology for tracing the chemical evolution of the Milky Way stellar populations. The combination with the astrometry and photometry from the Gaia data releases allow us to build an accurate time evolving chemodynamical picture of the Galaxy with unprecedented detail. We employ the...