Simulated void galaxies in the standard cold dark matter model

Abstract

We analyze a (120 h^{-1} Mpc)^3 adaptive mesh refinement hydrodynamic simulation that contains a higher-resolution 31 x 31 x 35 h^{-3} Mpc subvolume centered on a ~30 Mpc diameter void. Our detailed ~1 kpc resolution allows us to identify 1300 galaxies within this void to a limiting halo mass of ~10^{10} M_sun. Nearly 1000 galaxies are found to be in underdense regions, with 300 galaxies residing in regions less than half the mean density of the simulation volume. We construct mock observations of the stellar and gas properties of these systems, and reproduce the range of colors and luminosities observed in the SDSS for nearby (z < 0.03) galaxies. We find no trends with density for the most luminous (M_r < -18) galaxies, however our dwarf void galaxies (M_r > -16), though they are less reliably resolved, typically appear bluer, with higher rates of star formation and specific star formation and lower mean stellar ages than galaxies in average density environments. We find a significant population of low luminosity (M_r ~ -14) dwarf galaxies that is preferentially located in low density regions and specifically in the void center. This population may help to reduce, but not remove, the discrepancy between the predicted and observed number of void galaxies.

23 pages, 14 figures, submitted to ApJ

References in corpus (14)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• Bulgeless Giant Galaxies Challenge our Picture of Galaxy Formation by Hierarchical Clustering
• Turbulent Structure of a Stratified Supernova-Driven Interstellar Medium
• The Baryon Content of Extremely Low Mass Dwarf Galaxies
• The Properties of Galaxies in Voids
• The History of Cosmological Star Formation: Three Independent Approaches and a Critical Test Using the Extragalactic Background Light
• The emptiness of voids: yet another over-abundance problem for the LCDM model
• Only the Lonely: H I Imaging of Void Galaxies
• The Void Phenomenon Explained
• KK246, a dwarf galaxy with extended H I disk in the Local Void
• The Arecibo Legacy Fast ALFA Survey: V. HI Source Catalog of the Anti-Virgo Region at dec=27 degrees
• On the importance of high redshift intergalactic voids
• On the kinematics of the Local cosmic void

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• Precision cosmology with voids in the final BOSS data
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• The HI Mass Function and Velocity Width Function of Void Galaxies in the Arecibo Legacy Fast ALFA Survey
• On the Star Formation Properties of Void Galaxies
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• Void Galaxies Follow a Distinct Evolutionary Path in the Environmental COntext Catalog
• Voids in Lyα Forest Tomographic Maps
• Study of galaxies in the Eridanus void. Sample and oxygen abundances
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• Galaxy And Mass Assembly (GAMA): The Bright Void Galaxy Population in the Optical and Mid-IR
• Metal Abundances and Star-Formation Rates of Emission-Line Galaxies in and around the Bootes Void
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• The Local Void: for or against LCDM?
• Study of galaxies in the Lynx-Cancer void. VI. HI-observations with the Nancay Radio Telescope
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• Effects of dark matter pressure on the ellipticity of cosmic voids
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• Extended Void Merging Tree Algorithm for Self-Similar Models
• The Void Galaxy Survey: Galaxy Evolution and Gas Accretion in Voids