The Milky Way's bulge star formation history as constrained from its bimodal chemical abundance distribution

Abstract

We conduct a quantitative analysis of the star formation history (SFH) of the Milky Way's bulge by exploiting the constraining power of its stellar [Fe/H] and [Mg/Fe] distribution functions. Using APOGEE data, we confirm the previously-established bimodal [Mg/Fe]--[Fe/H] distribution within 3 kpc of the inner Galaxy. Compared to that in the solar vicinity, the high-$\alpha$ population in the bulge peaks at a lower [Fe/H]. To fit these observations, we use a simple but flexible star formation framework, which assumes two distinct stages of gas accretion and star formation, and systematically evaluate a wide multi-dimensional parameter space. We find that the data favor a three-phase SFH that consists of an initial starburst, followed by a rapid star formation quenching episode and a lengthy, quiescent secular evolution phase. The metal-poor, high-$\alpha$ bulge stars ([Fe/H]<0.0 and [Mg/Fe]>0.15) are formed rapidly (<2 Gyr) during the early starburst. The density gap between the high- and low-$\alpha$ sequences is due to the quenching process. The metal-rich, low-$\alpha$ population ([Fe/H]>0.0 and [Mg/Fe]<0.15) then accumulates gradually through inefficient star formation during the secular phase. This is qualitatively consistent with the early SFH of the inner disk. Given this scenario, a notable fraction of young stars (age<5 Gyr) is expected to persist in the bulge. Combined with extragalactic observations, these results suggest that a rapid star formation quenching process is responsible for bimodal distributions in both the Milky Way's stellar populations and in the general galaxy population and thus plays a critical role in galaxy evolution.

arXiv comment16 pages, 12 figures. MNRAS in press

References in corpus (83)

• On the variation of the Initial Mass Function
• The Global Schmidt Law in Star Forming Galaxies
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Core-Collapse Supernovae from 9 to 120 Solar Masses Based on Neutrino-powered Explosions
• Galactic chemical evolution: Carbon through Zinc
• ASPCAP: The Apogee Stellar Parameter and Chemical Abundances Pipeline
• The Green Valley is a Red Herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies
• Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
• Presupernova evolution and explosive nucleosynthesis of rotating massive stars in the metallicity range -3 <=[Fe/H]<= 0
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. V. Evidence for a wide age distribution and a complex MDF
• Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR Stellar Photometry
• The spatial structure of mono-abundance sub-populations of the Milky Way disk
• The Data Reduction Pipeline for the Apache Point Observatory Galactic Evolution Experiment
• Mapping the Three-Dimensional Density of the Galactic Bulge with VVV Red Clump Stars
• Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Explosive yields of massive stars from Z=0 to Z=Zsun
• The Metal Content of Bulge Field Stars from FLAMES-GIRAFFE Spectra. I. Stellar parameters and Iron Abundances
• Bulge Formation by the Coalescence of Giant Clumps in Primordial Disk Galaxies
• ARGOS III: Stellar Populations in the Galactic Bulge of the Milky Way
• Environment and self-regulation in galaxy formation
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• Target Selection for the SDSS-IV APOGEE-2 Survey
• The delay-time distribution of type-Ia supernovae from Sloan II
• Abundances of Baade's Window Giants from Keck/HIRES Spectra: II. The Alpha- and Light Odd Elements
• Yields of AGB and SAGB models with chemistry of low- and high-metallicity Globular Clusters
• The metallicity distribution of bulge clump giants in Baade's Window
• The stellar population structure of the Galactic disk
• Oxygen, Sodium, Magnesium and Aluminium as tracers of the Galactic Bulge Formation
• The Milky Way has no in-situ halo other than the heated thick disc. Composition of the stellar halo and age-dating the last significant merger with Gaia DR2 and APOGEE
• Chemical similarities between Galactic bulge and local thick disk red giants: O, Na, Mg, Al, Si, Ca and Ti
• Tracing chemical evolution over the extent of the Milky Way's Disk with APOGEE Red Clump Stars
• Chemical similarities between Galactic bulge and local thick disk red giant stars
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. VI. Age and abundance structure of the stellar populations in the central sub-kpc of the Milky Way
• The age-metallicity structure of the Milky Way disk
• Reconstructing the star formation history of the Milky Way disc(s) from chemical abundances
• Oxygen abundances in the Galactic Bulge: evidence for fast chemical enrichment
• Star formation is boosted (and quenched) from the inside out: radial star formation profiles from MaNGA
• From the bulge to the outer disc: StarHorse stellar parameters, distances, and extinctions for stars in APOGEE DR16 and other spectroscopic surveys
• Insights on the Milky Way bulge formation from the correlations between kinematics and metallicity
• The GIRAFFE Inner Bulge Survey (GIBS) III. Metallicity distributions and kinematics of 26 Galactic bulge fields
• APOGEE Data Releases 13 and 14: Stellar Parameter and Abundance Comparisons With Independent Analyses
• Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way's quiescent merger history and in-situ bulge
• The Gaia-ESO Survey: metallicity and kinematic trends in the Milky Way bulge
• Metal-enriched galactic outflows shape the mass-metallicity relationship
• The Gaia-ESO Survey: Exploring the complex nature and origins of the Galactic bulge populations
• The Effect of Different Type Ia Supernova Progenitors on Galactic Chemical Evolution
• Chemical Evolution of the Galactic Bulge as Derived from High-Resolution Infrared Spectroscopy of K and M Red Giants
• The imprint of clump formation at high redshift. I. A disc alpha-abundance dichotomy
• Constraining the structure and formation of the Galactic bulge from a field in its outskirts. FLAMES-GIRAFFE spectra of about 400 red giants around (l,b)=(0°,-10°)
• The disc origin of the Milky Way bulge: Dissecting the chemo-morphological relations using N-body simulations and APOGEE
• Detailed abundances for M giants in two inner bulge fields from Infrared Spectroscopy
• Star formation history of the Galactic bulge from deep HST imaging of low reddening windows
• APOGEE DR14/DR15 Abundances in the Inner Milky Way
• SDSS-IV MaNGA: Inside-out vs. outside-in quenching in different local environments
• Phylogeny of the Milky Way's inner disk and bulge populations: Implications for gas accretion, (the lack of) inside-out thick disk formation, and quenching
• Stellar Yields and Chemical Evolution I: Abundance Ratios and Delayed Mixing in the Solar Neighbourhood
• Chemodynamical Modelling of the Galactic Bulge and Bar
• The mass-metallicity relations for gas and stars in star-forming galaxies: strong outflow vs variable IMF
• Natures of a clump-origin bulge: a pseudobulge-like but old metal-rich bulge
• Chemical evolution of the Galactic bulge: different stellar populations and possible gradients
• The age-chemical abundance structure of the Galactic disc II: $\alpha$-dichotomy and thick disc formation
• SDSS-IV MaNGA: Modelling the metallicity gradients of gas and stars - radially dependent metal outflow vs IMF
• Accelerated post-AGB evolution, initial-final mass relations, and the star-formation history of the Galactic bulge
• The origin of stellar populations in the Galactic bulge from chemical abundances
• SDSS-IV MaNGA: Star formation cessation in low-redshift galaxies I. Dependence on stellar mass and structural properties
• The bimodal [Mg/Fe] versus [Fe/H] bulge sequence as revealed by APOGEE DR14
• The Bulge Metallicity Distribution from the APOGEE Survey
• Two-Component Galactic Bulge Probed with Renewed Galactic Chemical Evolution Model
• Age-chemical abundance structure of the Galaxy I: Evidence for a late accretion event in the outer disc at z ~ 0.6
• Formation of the Galactic bulge from a two-component stellar disk: Explaining cylindrical rotation and vertical metallicity gradient
• Baade's window with APOGEE: Metallicities, ages and chemical abundances
• The Controversial Star-Formation History and Helium Enrichment of the Milky Way Bulge
• Was the Milky Way Bulge Formed From The Buckling Disk Instability, Hierarchical Collapse, Accretion of Clumps, or All of the Above?
• SDSS-IV MaNGA: Environmental dependence of gas metallicity gradients in local star-forming galaxies
• Modelling the mass-metallicity relation of star-forming galaxies from z ~ 3.5 to z ~ 0
• Heavy element evolution in the inner regions of the Milky Way
• $Chempy$: A flexible chemical evolution model for abundance fitting - Do the Sun's abundances alone constrain chemical evolution models?
• The quenching time scale and quenching rate of galaxies
• What planetary nebulae tell us about helium and the CNO elements in Galactic bulge stars

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• The NIRVANDELS Survey: a robust detection of $\alpha$-enhancement in star-forming galaxies at $z\simeq 3.4$
• How Many Components? Quantifying the Complexity of the Metallicity Distribution in the Milky Way Bulge with APOGEE
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• The imprint of clump formation at high redshift. II. The chemistry of the bulge
• Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia
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• Probing the Milky Way stellar and brown dwarf initial mass function with modern microlensing observations
• SpectroTranslator: a deep-neural network algorithm to homogenize spectroscopic parameters
• Rediscovering the Milky Way with orbit superposition approach and APOGEE data II. Chrono-chemo-kinematics of the disc
• On the variation in stellar $\alpha$-enhancements of star-forming galaxies in the EAGLE simulation
• The Milky Way in context: The formation of galactic discs and chemical sequences from a cosmological perspective
• Build-up and survival of the disc: From numerical models of galaxy formation to the Milky Way
• Observing Double White Dwarfs with the Lunar GW Antenna
• The Two-infall Model Revisited: Constraints on Milky Way Bulge Assembly from >30,000 Galactic Chemical Evolution Models and Machine Learning
• Dynamical properties of high-[Mg/Fe] stars in the Milky Way bar region