Cosmological implications of dwarf spheroidal chemical evolution
arXiv:astro-ph/0602489 · doi:10.1086/504893
Abstract
The chemical properties of dwarf spheroidals in the local group are shown to be inconsistent with star formation being truncated after the reionization epoch (z~8). Enhanced levels of [Ba/Y] in stars in dwarf spheroidals like Sculptor indicate strong s-process production from low-mass stars whose lifetimes are comparable with the duration of the pre-reionization epoch. The chemical evolution of Sculptor is followed using a model with SNeII and SNeIa feedback and mass- and metallicity-dependent nucleosynthetic yields for elements from H to Pb. We are unable to reproduce the Ba/Y ratio unless stars formed over an interval long enough for the low-mass stars to pollute the interstellar medium with s-elements. This robust result challenges the suggestion that most of the local group dwarf spheroidals are fossils of reionization and supports the case for large initial dark matter halos.
7 pages, 4 figures. Accepted for publication in ApJ. Minor changes following referee report
References in corpus (48)
- The Global Schmidt Law in Star Forming Galaxies
- Where are the missing galactic satellites?
- Dwarf Galaxies of the Local Group
- Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
- Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
- Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures
- Galactic Chemical Evolution: Hydrogen Through Zinc
- Reionization and the abundance of galactic satellites
- Stellar Chemical Signatures And Hierarchical Galaxy Formation
- Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
- Absorption-Line Probes of Gas and Dust in Galactic Superwinds
- The tumultuous lives of galactic dwarfs and the missing satellites problem
- VLT/UVES Abundances in Four Nearby Dwarf Spheroidal Galaxies: I. Nucleosynthesis and Abundance Ratios
- The Metal Content of Dwarf Starburst Winds: Results from Chandra Observations of NGC 1569
- Neutron star mergers versus core-collapse supernovae as dominant r-process sites in the early Galaxy
- On the typical timescale for the chemical enrichment from SNeIa in Galaxies
- The Photo-Evaporation of Dwarf Galaxies During Reionization
- Galactic chemical evolution of heavy elements: from Barium to Europium
- Density Profiles of Cold Dark Matter Substructure: Implications for the Missing Satellites Problem
- Lambda-Cold Dark Matter, Stellar Feedback, and the Galactic Halo Abundance Pattern
- Formation Histories of Dwarf Galaxies in the Local Group
- 'Sculptor'-ing the Galaxy? The Chemical Compositions of Red Giants in the Sculptor Dwarf Spheroidal Galaxy
- The importance of tides for the Local Group dwarf spheroidals
- Impact of Reionization on the Stellar Populations of Nearby Dwarf Galaxies
- The Predicted Metallicity Distribution of Stars in Dwarf Spheroidal Galaxies
- Non-parametric star formation histories for 5 dwarf spheroidal galaxies of the local group
- The r-process in supernova explosions from the collapse of O-Ne-Mg cores
- Chemical Evolution of Dwarf Spheroidal and Blue Compact Galaxies
- Three-dimensional simulations of the interstellar medium in dwarf galaxies - I. Ram pressure stripping
- Galactic chemical abundance evolution in the solar neighborhood up to the Iron peak
- Lead: Asymptotic Giant Branch production and Galactic Chemical Evolution
- A New Prescription for Protogalactic Feedback and Outflows: Where Have All the Baryons Gone?
- Star formation feedback and metal enrichment by SN Ia and SN II in dwarf spheroidal galaxies: the case of Draco
- r-Process in Prompt Supernova Explosions Revisited
- The Epoch of Reionization
- Deriving the Metallicity Distribution Function of Galactic Systems
- Continuous star formation in IZw18
- The Chemical Evolution of Magnesium Isotopic Abundances in the Solar Neighbourhood
- The Absence of Extra-Tidal Structure in the Sculptor Dwarf Spheroidal Galaxy
- Probing the Site for r-Process Nucleosyntheis with Abundances of Barium and Magnesium in Extremely Metal-Poor Stars
- Dynamical and chemical evolution of NGC1569
- The Evolution of Barium and Europium in Local Dwarf Spheroidal Galaxies
- Star Formation Histories of Local Group Dwarf Galaxies
- Constraints on Early Nucleosynthesis from the Abundance Pattern of a Damped Ly-alpha System at z = 2.626
- Modeling star formation in dwarf spheroidal galaxies: a case for extended dark matter halos
- Three-dimensional simulations of the interstellar medium in dwarf galaxies - II. Galactic wind
- An analytic model for the galactic winds and mass outflows
- Probing dark matter with X-ray binaries
Cited by in corpus (36)
- Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
- The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
- Tracing Galaxy Formation with Stellar Halos II: Relating Substructure in Phase- and Abundance-Space to Accretion Histories
- Two distinct halo populations in the solar neighborhood. II. Evidence from stellar abundances of Mn, Cu, Zn, Y, and Ba
- Constraining Sub-Grid Physics with High-Redshift Spatially-Resolved Metallicity Distributions
- r-Process Nucleosynthesis: Connecting Rare-Isotope Beam Facilities with the Cosmos
- Dark matter substructure and dwarf galactic satellites
- Multi-Element Abundance Measurements from Medium-Resolution Spectra. IV. Alpha Element Distributions in Milky Way Dwarf Satellite Galaxies
- VLT/FLAMES high-resolution chemical abundances in Sculptor: a textbook dwarf spheroidal galaxy
- The Impact of Modeling Assumptions in Galactic Chemical Evolution Models
- Life and times of dwarf spheroidal galaxies
- Star Formation History and Chemical Evolution of the Sextans Dwarf Spheroidal Galaxy
- The Chemical Evolution of Dwarf Spheroidal Galaxies: Dissecting the Inner Regions and their Stellar Populations
- Beyond the Iron Peak: r- and s-process Elemental Abundances in Stars with Planets
- Effects of the galactic winds on the stellar metallicity distribution of dwarf spheroidal galaxies
- The Cosmological Impact of Luminous TeV Blazars III: Implications for Galaxy Clusters and the Formation of Dwarf Galaxies
- The Aptly Named Phoenix Dwarf Galaxy
- A Two Micron All-Sky Survey View of the Sagittarius Dwarf Galaxy: VI. s-Process and Titanium Abundance Variations Along the Sagittarius Stream
- An HI Survey of Six Local Group Analogs. II. HI properties of group galaxies
- Chemical consequences of low star formation rates: stochastically sampling the IMF
- The Cosmic Hunt for Members in the Outskirts of Ultra Faint Dwarf Galaxies: Ursa Major I, Coma Berenices, and Boötes I
- Simultaneous Constraints on the Star Formation History and Nucleosynthesis of Sculptor dSph
- Numerical Simulations of Bubble-Induced Star Formation in Dwarf Irregular Galaxies with a Novel Stellar Feedback Scheme
- Mass and Metallicity Requirement in Stellar Models for Galactic Chemical Evolution Applications
- Chemical Signature Indicating A Lack of Massive Stars in Dwarf Galaxies
- A 3D view of dwarf galaxies with Gaia and VLT/FLAMES I. The Sculptor dwarf spheroidal
- A New Chemical Evolution Model for Dwarf Spheroidal Galaxies based on Observed Long Star Formation Histories
- What is the Milky Way outer halo made of? High resolution spectroscopy of distant red giants
- Stars on the edge: Galactic tides and the outskirts of the Sculptor dwarf spheroidal
- The [alpha/Fe] ratios of very metal-poor stars within the IGIMF theory
- The evolution of the photometric properties of Local Group dwarf spheroidal galaxies
- Near-infrared chemical abundances of stars in the Sculptor dwarf galaxy
- Probing baryonic processes and gastrophysics in the formation of the Milky Way dwarf satellites: I. metallicity distribution properties
- The Chemistry of the Local Group
- About the Chemical Evolution of dSphs (and the peculiar Globular Cluster Omega Cen)
- HR-GO II: chemical abundances of low- retrograde dynamically-tagged-groups: Revealing Thamnos as a very metal-poor substructure