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

Abstract

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, in addition to the identification of over 11 million variable stars. Using the astrophysical parameters and variability classifications provided in Gaia DR3, we select various stellar populations to explore and identify non-axisymmetric features in the disc of the Milky Way in both configuration and velocity space. Using more about 580 thousand sources identified as hot OB stars, together with 988 known open clusters younger than 100 million years, we map the spiral structure associated with star formation 4-5 kpc from the Sun. We select over 2800 Classical Cepheids younger than 200 million years, which show spiral features extending as far as 10 kpc from the Sun in the outer disc. We also identify more than 8.7 million sources on the red giant branch (RGB), of which 5.7 million have line-of-sight velocities, allowing the velocity field of the Milky Way to be mapped as far as 8 kpc from the Sun, including the inner disc. 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. Meanwhile, 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. (abridged)

35 pages, 27 figures, accepted for publication in A&A special Gaia DR3 issue. V2: abstract completed. V3: complete author list and link to data: https://drive.google.com/drive/u/1/folders/1yOJPjYmM7QK5XVsqaiSOTuwDQNti2LlZ

References in corpus (38)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The GALAH Survey: Scientific Motivation
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• Painting a portrait of the Galactic disc with its stellar clusters
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Dynamical modelling of the Galactic bulge and bar: the Milky Way's bar pattern speed, stellar, and dark matter mass distribution
• The Structure of the Milky Way's Bar Outside the Bulge
• Gaia Data Release 3 Properties and validation of the radial velocities
• The mass distribution in the Galactic Centre from interferometric astrometry of multiple stellar orbits
• Gaia Data Release 3: Analysis of RVS spectra using the General Stellar Parametriser from spectroscopy
• Ejection of Supermassive Black Holes from Galaxy Cores
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5
• Gaia Data Release 3: Astrophysical parameters inference system (Apsis) I -- methods and content overview
• Gaia Data Release 3: Analysis of the Gaia BP/RP spectra using the General Stellar Parameterizer from Photometry
• The Spiral Structure of the Outer Milky Way in Hydrogen
• Gaia Data Release 3: Catalogue Validation
• Gaia Data Release 3: Apsis II -- Stellar Parameters
• Bending and Breathing Modes of the Galactic Disk
• Hunting for open clusters in \textit{Gaia} DR2: the Galactic anticentre
• Structural parameters of 389 local Open Clusters
• Radial and vertical flows induced by galactic spiral arms: likely contributors to our "wobbly Galaxy''
• Hunting for open clusters in Gaia EDR3: $628$ new open clusters found with OCfinder
• Stellar labels for hot stars from low-resolution spectra - I. the HotPayne method and results for 330,000 stars from LAMOST DR6
• Gaia DR3: Specific processing and validation of all-sky RR Lyrae and Cepheid stars -- The Cepheid sample
• Gaia Data Release 1 - The Cepheid & RR Lyrae star pipeline and its application to the south ecliptic pole region
• The power spectrum of the Milky Way: Velocity fluctuations in the Galactic disk
• A direct measurement of the distance to the Galactic center using the kinematics of bar stars
• An all-sky proper motion map of the Sagittarius stream using Gaia DR2
• Distribution and kinematics of atomic and molecular gas inside the Solar circle
• Classical Cepheid period-Wesenheit-metallicity relation in the Gaia bands
• Chemo-kinematics of the Milky Way spiral arms and bar resonances: connection to ridges and moving groups in the Solar vicinity
• Selection Functions in Astronomical Data Modeling, with the Space Density of White Dwarfs as Worked Example
• Gaia Data Release 3: Hot-star radial velocities
• The analysis of realistic Stellar Gaia mock catalogues. I. Red Clump Stars as tracers of the central bar
• The spiral structure in the Solar neighborhood
• Period-Age-Metallicity and Period-Age-Color-Metallicity relations for Classical Cepheids: an application to the Gaia EDR3 sample
• A barred Milky Way surrogate from an N-body simulation
• Burton's Curse: The Impact of Bulk Flows on the Galactic Longitude-Velocity Diagram and the Illusion of a Continuous Perseus Arm

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• Cepheid Metallicity in the Leavitt Law (C--MetaLL) survey: VIII. High-Resolution IGRINS Spectroscopy of 23 Classical Cepheids: Validating NIR Abundances
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