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Gaia Data Release 3: mapping the asymmetric disc of the Milky Way

Abstract: Context: With the most recent Gaia data release, the number of sources with complete 6D phase space information (position and velocity) has increased to well over 33 million stars, while stellar astrophysical parameters are provided for more than 470 million sources, and more than 11 million variable stars are identified. Aim: Using the astrophysical parameters and variability classifications provided in Gaia DR3, we selected various stellar populations to explore and identify non-axisymmetric features in the disc of the Milky Way in configuration and velocity space. Methods. Using more about 580 000 sources identified as hot OB stars, together with 988 known open clusters younger than 100 Myr, we mapped the spiral structure associated with star formation 4?5 kpc from the Sun. We selected over 2800 Classical Cepheids younger than 200 Myr that show spiral features extending as far as 10 kpc from the Sun in the outer disc. We also identified more than 8.7 million sources on the red giant branch (RGB), of which 5.7 million have line-of-sight velocities. This later sample allows the velocity field of the Milky Way to be mapped as far as 8 kpc from the Sun, including the inner disc. Results: The spiral structure revealed by the young populations is consistent with recent results using Gaia EDR3 astrometry and source lists based on near-infrared photometry, showing the Local (Orion) Arm to be at least 8 kpc long, and an outer arm consistent with what is seen in HI surveys, which seems to be a continuation of the Perseus arm into the third quadrant. The subset of RGB stars with velocities clearly reveals the large-scale kinematic signature of the bar in the inner disc, as well as evidence of streaming motions in the outer disc that might be associated with spiral arms or bar resonances. A local comparison of the velocity field of the OB stars reveals similarities and differences with the RGB sample. Conclusions: This cursory study of Gaia DR3 data shows there is a rich bounty of kinematic information to be explored more deeply, which will undoubtedly lead us to a clearer understanding of the dynamical nature of the non-axisymmetric structures of the Milky Way.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Astronomy & Astrophysics, 2023, 674, A37

Editorial: EDP Sciences

 Fecha de publicación: 01/06/2023

Nº de páginas: 35

Tipo de publicación: Artículo de Revista

 DOI: 10.1051/0004-6361/202243797

ISSN: 0004-6361,1432-0746

Proyecto español: ESP2016-80079-C2-1-R

Url de la publicación: https://doi.org/10.1051/0004-6361/202243797

Autores/as

DRIMMEL, RONALD E.

ROMERO GÓMEZ, MANUEL

CHEMIN, LAURENT

RAMOS, PAU

POGGIO, ELOISA

RIPEPI, VINCENZO

ANDRAE, RENÉ

BLOMME, RONNY

CANTAT-GAUDIN, T.

CASTRO-GINARD, ALFRED

CLEMENTINI, GISELLA

FIGUERAS, FRANCESCA

FOUESNEAU, MORGAN

FRÉMAT, YVES

JARDINE, K.

KHANNA, SHOURYA

LOBEL, ALEX

MARSHALL, DOUGLAS J.

MURAVEVA, TATIANA