The Milky Way Revealed by Gaia: The Next Frontier

Session

WG1: The Milky Way as a Galaxy (IV). Chair: Nic Walton

7 Sept 2023, 11:15

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

60. Who is In, and Who is Not? Determining the Gaia Survey Selection Function

Alfred Castro-Ginard (Leiden Observatory)

07/09/2023, 11:15

Contributed talk

What is the probability that an astronomical object of certain properties enters the Gaia catalogue (or not)? The GaiaUnlimited project aims to enable the full potential of Gaia by characterising its survey selection function, as well as for different subsamples of the data, which are key ingredients in most statistical studies of the Milky Way. By comparing Gaia with deeper imaging from the...

44. The mass-loss history of the Sagittarius dwarf galaxy

Chervin Laporte (ICCUB), Joao Amarante (ICCUB)

07/09/2023, 11:30

Contributed talk

Despite its discovery almost 30 years ago and its subsequent mapping of its core and tidal tails, the progenitor mass of Sagittarius is still highly uncertain/debated, spanning almost two orders of magnitudes!

On the one hand, recent observations of the chemo-dynamical structure of Sgr's stellar stream and structure of the outer disc favour a massive progenitor with $>6\times10^{10}\,...

56. The Large Magellanic Cloud dynamics with high resolution glasses

Óscar Jiménez Arranz

07/09/2023, 11:45

Contributed talk

The Large Magellanic Cloud (LMC) turns out to be a unique and impressive test laboratory thanks to the latest Gaia Data Release 3. Being the closest galaxy in the Local Group, Gaia proper motions and line-of-sight velocities allow it to make 3D velocity maps for the first time (Jiménez-Arranz+23) and endeavour dynamical studies in detail, such as the determination of the LMC bar pattern speed...

87. Multiple phase spirals suggest multiple origins in Gaia DR3 (online)

Jason Hunt (Centre for Computational Astrophysics, Flatiron Institute)

07/09/2023, 12:00

Contributed talk

Gaia Data Release 2 revealed that the Milky Way contains significant indications of departures from equilibrium in the form of asymmetric features in the phase space density of stars in the Solar neighbourhood. One such feature is the z-vz phase spiral, interpreted as the response of the disc to the influence of a perturbation perpendicular to the disc plane, which could be external (e.g. a...

34. The Milky Way disc radial abundance gradient from planetary nebulae reveled by Gaia (poster pitch, online)

Oscar Cavichia (Universidade Federal de Itajuba)

07/09/2023, 12:15

Contributed e-poster

Radial abundance gradients in the Galactic disc are one of the most important observational constraints to study the chemical evolution of the Milky Way galaxy and also other galaxies in the universe. The radial gradient is the result of many physical processes that occur since the formation of the Galaxy, as e.g. the infalling gas to form the disc, the star formation history, radial gas...

69. Chemical footprints of the Galactic spiral arms revealed by Gaia DR3 (poster pitch, online)

Eloisa Poggio

07/09/2023, 12:17

Contributed e-poster

We map chemical inhomogeneities in the Milky Way’s disc out to a distance of ~4 kpc from the Sun, using different samples of bright giant stars in Gaia Data Release 3. The samples are selected using effective temperatures and surface gravities from the GSP-Spec module, and they are expected to trace stellar populations of a different typical age. The cool (old) giants exhibit a relatively...

100. Where’s Waldo? Unveiling a metal-poor extension of the Milky Way thin disc with Pristine-Gaia- synthetic (poster pitch)

Isaure Gonzalez Rivera (Obs. de la Côte d’Azur)

07/09/2023, 12:19

Contributed e-poster

Our understanding of the Milky Way’s formation history can be refined by analyzing the information encoded in its oldest stellar populations, typically their chemical composition and orbital motion. Having access to such properties is valuable to depict a larger picture of the earliest stages of galactic formation. With the rise of Gaia, an orbital characterization of the different components...

111. Final remarks

Nicholas Walton (IoA. Cambridge)

07/09/2023, 12:21