Milky Way type galaxies in a LCDM cosmology

Abstract

We analyse a sample of 52,000 Milky Way (MW) type galaxies drawn from the publicly available galaxy catalogue of the Millennium Simulation with the aim of studying statistically the differences and similarities of their properties in comparison to our Galaxy. Model galaxies are chosen to lie in haloes with maximum circular velocities in the range 200-250 km/seg and to have bulge-to-disk ratios similar to that of the Milky Way. We find that model MW galaxies formed quietly through the accretion of cold gas and small satellite systems. Only 12 per cent of our model galaxies experienced a major merger during their lifetime. Most of the stars formed in situ, with only about 15 per cent of the final mass gathered through accretion. Supernovae and AGN feedback play an important role in the evolution of these systems. At high redshifts, when the potential wells of the MW progenitors are shallower, winds driven by supernovae explosions blow out a large fraction of the gas and metals. As the systems grow in mass, SN feedback effects decrease and AGN feedback takes over, playing a more important role in the regulation of the star formation activity at lower redshifts. Although model Milky Way galaxies have been selected to lie in a narrow range of maximum circular velocities, they nevertheless exhibit a significant dispersion in the final stellar masses and metallicities. Our analysis suggests that this dispersion results from the different accretion histories of the parent dark matter haloes. Statically, we also find evidences to support the Milky Way as a typical Sb/Sc galaxy in the same mass range, providing a suitable benchmark to constrain numerical models of galaxy formation

10 pages, 7 figures, mne2.cls, MNRAS, replaced with accepted version

References in corpus (33)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Populating a cluster of galaxies - I. Results at z=0
• The hierarchical formation of the brightest cluster galaxies
• Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
• GAIA: Composition, Formation and Evolution of the Galaxy
• The Mass-Metallicity Relation at z~2
• The Radial Velocity Experiment (RAVE): first data release
• The subhalo populations of LCDM dark haloes
• The Milky Way Tomography with SDSS: II. Stellar Metallicity
• A primer on hierarchical galaxy formation: the semi-analytical approach
• The Stellar, Gas and Dynamical Masses of Star-Forming Galaxies at z~2
• The Origin of the Galaxy Mass-Metallicity Relation and Implications for Galactic Outflows
• The Gemini Deep Deep Survey. VII. The Redshift Evolution of the Mass-Metallicity Relation
• On Extending the Mass-Metallicity Relation of Galaxies by 2.5 Decades in Stellar Mass
• Chemical enrichment of the intra-cluster and intergalactic medium in a hierarchical galaxy formation model
• Chemo-spectrophotometric evolution of spiral galaxies: I. The model and the Milky Way
• Cold Dark Matter Substructure and Galactic Disks I: Morphological Signatures of Hierarchical Satellite Accretion
• The Origin and Evolution of the Mass-Metallicity Relationship for Galaxies: Results from Cosmological N-Body Simulations
• The Milky Way: An Exceptionally Quiet Galaxy; Implications for the formation of spiral galaxies
• Masses for the Local Group and the Milky Way
• Chemical Abundance Distributions of Galactic Halos and their Satellite Systems in a Lambda CDM Universe
• The Galaxy and its stellar halo: insights on their formation from a hybrid cosmological approach
• The QUEST RR Lyrae Survey II: The Halo Overdensities in the First Catalog
• The Role of Environment in the Mass-Metallicity Relation
• Formation of the Galactic stellar halo I. Structure and kinematics
• Clues for the origin of the fundamental metallicity relations. I: The hierarchical building up of the structure
• A Younger Age for the Universe
• Discovery of a very extended X-ray halo around a quiescent spiral galaxy - the "missing link" of galaxy formation
• Fingerprints of the Hierarchical Building up of the Structure on the Mass-Metallicity Relation
• The Hierarchical Formation of the Galactic Disk

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• The Cosmic Ballet: spin and shape alignments of haloes in the cosmic web
• Modelling Element Abundances in Semi-analytic Models of Galaxy Formation
• Estimating the H I gas fractions of galaxies in the local Universe
• Hot gas halos around disk galaxies: Confronting cosmological simulations with observations
• Chemical evolution of local galaxies in a hierarchical model
• The mid-life crisis of the Milky Way and M31
• The dark matter assembly of the Local Group in constrained cosmological simulations of a LambdaCDM universe
• Did the Milky Way just light up? The recent star formation history of the Galactic disc
• Cold versus Warm Dark Matter simulations of a galaxy group
• Host galaxies of long gamma-ray bursts in the Millennium Simulation