Radial structure and formation of the Milky Way disc

Katz, D.; Gómez, A.; Haywood, M.; Snaith, O.; Di Matteo, P.

doi:10.1051/0004-6361/202140453

Radial structure and formation of the Milky Way disc

Journal Article · Wed Dec 01 00:00:00 EST 2021 · Astronomy and Astrophysics

DOI:https://doi.org/10.1051/0004-6361/202140453· OSTI ID:1982277

Katz, D. ^[1]; Gómez, A. ^[1]; Haywood, M. ^[1]; Snaith, O. ^[1]; Di Matteo, P. ^[1]

Paris Sciences et Lettres University (France). Paris Observatory; Centre National de la Recherche Scientifique (CNRS) (France)

The formation of the Galactic disc is an enthusiastically debated issue. Numerous studies and models seek to identify the dominant physical process(es) that shaped its observed properties; for example, satellite accretion, starburst, quenching, gas infall, and stellar radial migration. Taking advantage of the improved coverage of the inner Milky Way provided by the SDSS DR16 APOGEE catalogue and of the ages published in the APOGEE-AstroNN Value Added Catalogue (VAC), we examined the radial evolution of the chemical and age properties of the Galactic stellar disc with the aim of better constraining its formation. Using a sample of 199 307 giant stars with precise APOGEE abundances and APOGEE-AstroNN ages, selected in a ±2 kpc layer around the galactic plane, we assessed the dependency as a function of guiding radius of (i) the median metallicity, (ii) the ridge lines of the [Fe/H] – [Mg/Fe] and age–[Mg/Fe] distributions, and (iii) the age distribution function (ADF). The giant star sample allows us to probe the radial behaviour of the Galactic disc from R_g = 0 to 14–16 kpc. The thick disc [Fe/H] – [Mg/Fe] ridge lines follow closely grouped parallel paths, supporting the idea that the thick disc did form from a well-mixed medium. However, the ridge lines present a small drift in [Mg/Fe], which decreases with increasing guiding radius. At sub-solar metallicity, the intermediate and outer thin disc [Fe/H] – [Mg/Fe] ridge lines follow parallel sequences shifted to lower metallicity as the guiding radius increases. We interpret this pattern as the signature of a dilution of the interstellar medium from R_g ~ 6 kpc to the outskirts of the disc, which occurred before the onset of the thin disc formation. The APOGEE-AstroNN VAC provides stellar ages for statistically significant samples of thin disc stars from the Galactic centre up to R_g ~ 14 kpc. An important result provided by this dataset is that the thin disc presents evidence of an inside-out formation up to R_g ~ 10 – 12 kpc. Moreover, about ~7 Gyr ago, the [Mg/Fe] ratio in the outer thin disc (R_g > 10 kpc) was higher by about ~0.03–0.05 dex than in the more internal regions of the thin disc. This could be the fossil record of a pollution of the outer disc gas reservoir by the thick disc during its starburst phase.

View Accepted Manuscript (DOE)

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: Alfred P. Sloan Foundation; USDOE Office of Science (SC)

OSTI ID:: 1982277

Journal Information:: Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 655; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Chemical evolution of local galaxies in a hierarchical model Calura, F.; Menci, N. Monthly Notices of the Royal Astronomical Society, Vol. 400, Issue 3 https://doi.org/10.1111/j.1365-2966.2009.15440.x	journal	December 2009
Nearby stars of the Galactic disc and halo - V: Nearby stars - V Fuhrmann, Klaus Monthly Notices of the Royal Astronomical Society, Vol. 414, Issue 4 https://doi.org/10.1111/j.1365-2966.2011.18476.x	journal	June 2011
Thin disc, thick disc and halo in a simulated galaxy: Disc galaxy decomposition Brook, C. B.; Stinson, G. S.; Gibson, B. K. Monthly Notices of the Royal Astronomical Society, Vol. 426, Issue 1 https://doi.org/10.1111/j.1365-2966.2012.21738.x	journal	September 2012
Aspcap: the Apogee Stellar Parameter and Chemical Abundances Pipeline García Pérez, Ana E.; Prieto, Carlos Allende; Holtzman, Jon A. The Astronomical Journal, Vol. 151, Issue 6 https://doi.org/10.3847/0004-6256/151/6/144	journal	May 2016
The Stellar Population Structure of the Galactic disk Bovy, Jo; Rix, Hans-Walter; Schlafly, Edward F. The Astrophysical Journal, Vol. 823, Issue 1 https://doi.org/10.3847/0004-637X/823/1/30	journal	May 2016
Spectroscopic Determination of Masses (and Implied Ages) for red Giants Ness, M.; Hogg, David W.; Rix, H. -W. The Astrophysical Journal, Vol. 823, Issue 2 https://doi.org/10.3847/0004-637X/823/2/114	journal	May 2016
The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Majewski, Steven R.; Schiavon, Ricardo P.; Frinchaboy, Peter M. The Astronomical Journal, Vol. 154, Issue 3 https://doi.org/10.3847/1538-3881/aa784d	journal	August 2017
Binary Companions of Evolved Stars in APOGEE DR14: Search Method and Catalog of ∼5000 Companions Price-Whelan, Adrian M.; Hogg, David W.; Rix, Hans-Walter The Astronomical Journal, Vol. 156, Issue 1 https://doi.org/10.3847/1538-3881/aac387	journal	June 2018
The Open Cluster Chemical Abundances and Mapping Survey. IV. Abundances for 128 Open Clusters Using SDSS/APOGEE DR16 Donor, John; Frinchaboy, Peter M.; Cunha, Katia The Astronomical Journal, Vol. 159, Issue 5 https://doi.org/10.3847/1538-3881/ab77bc	journal	April 2020
The Sixth Data Release of the Radial Velocity Experiment (Rave). II. Stellar Atmospheric Parameters, Chemical Abundances, and Distances Steinmetz, Matthias; Guiglion, Guillaume; McMillan, Paul J. The Astronomical Journal, Vol. 160, Issue 2 https://doi.org/10.3847/1538-3881/ab9ab8	journal	July 2020
The Sixth Data Release of the Radial Velocity Experiment (RAVE). I. Survey Description, Spectra, and Radial Velocities Steinmetz, Matthias; Matijevič, Gal; Enke, Harry The Astronomical Journal, Vol. 160, Issue 2 https://doi.org/10.3847/1538-3881/ab9ab9	journal	July 2020
APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South Jönsson, Henrik; Holtzman, Jon A.; Prieto, Carlos Allende The Astronomical Journal, Vol. 160, Issue 3 https://doi.org/10.3847/1538-3881/aba592	journal	August 2020
APOGEE DR14/DR15 Abundances in the Inner Milky Way Zasowski, G.; Schultheis, M.; Hasselquist, S. The Astrophysical Journal, Vol. 870, Issue 2 https://doi.org/10.3847/1538-4357/aaeff4	journal	January 2019
The Ages and Masses of a Million Galactic-disk Main-sequence Turnoff and Subgiant Stars from the LAMOST Galactic Spectroscopic Surveys Xiang, Maosheng; Liu, Xiaowei; Shi, Jianrong The Astrophysical Journal Supplement Series, Vol. 232, Issue 1 https://doi.org/10.3847/1538-4365/aa80e4	journal	August 2017
The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment Abolfathi, Bela; Aguado, D. S.; Aguilar, Gabriela The Astrophysical Journal Supplement Series, Vol. 235, Issue 2 https://doi.org/10.3847/1538-4365/aa9e8a	journal	April 2018
The Second APOKASC Catalog: The Empirical Approach Pinsonneault, Marc H.; Elsworth, Yvonne P.; Tayar, Jamie The Astrophysical Journal Supplement Series, Vol. 239, Issue 2 https://doi.org/10.3847/1538-4365/aaebfd	journal	December 2018
The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra Ahumada, Romina; Prieto, Carlos Allende; Almeida, Andrés The Astrophysical Journal Supplement Series, Vol. 249, Issue 1 https://doi.org/10.3847/1538-4365/ab929e	journal	June 2020

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