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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The neutral hydrogen content of galaxies in cosmological hydrodynamic simulations
Monthly Notices of the Royal Astronomical Society, Volume 434, No. 3, Year 2013
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Description
We examine the global HI properties of galaxies in quarter billion particle cosmological simulations using GADGET-2, focusing on howgalactic outflows impactHI content. We consider four outflow models, including a new one (ezw) motivated by recent interstellar medium simulations in which the wind speed and mass loading factor scale as expected for momentumdriven outflows for larger galaxies and energy-driven outflows for dwarfs (s >75 km s-1). To obtain predicted HI masses, we employ a simple but effective local correction for particle selfshielding and an observationally constrained transition from neutral to molecular hydrogen. Our ezw simulation produces an HI mass function whose faint-end slope of -1.3 agrees well with observations from the Arecibo Fast Legacy ALFA survey; other models agree less well. Satellite galaxies have a bimodal distribution in HI fraction versus halo mass, with smaller satellites and/or those in larger haloes more often being HI deficient. At a given stellar mass, HI content correlates with the star formation rate and inversely correlates with metallicity, as expected if driven by stochasticity in the accretion rate. To higher redshifts, massive HI galaxies disappear and the mass function steepens. The global cosmic HI density conspires to remain fairly constant from z ~ 5?0, but the relative contribution from smaller galaxies increases with redshift. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Dav́e, Romeel
South Africa, Bellville
University of the Western Cape
South Africa, Cape Town
Observatory
South Africa, Muizenberg
African Institute for Mathematical Sciences
United States, Tucson
The University of Arizona
Katz, Neal S.
United States, Amherst
University of Massachusetts Amherst
Oppenheimer, Benjamin Darwin
Netherlands, Leiden
Sterrewacht Leiden
Kollmeier, Juna A.
United States, Pasadena
Carnegie Observatories
Weinberg, David H.
United States, Columbus
The Ohio State University
Statistics
Citations: 165
Authors: 5
Affiliations: 8
Identifiers
Doi:
10.1093/mnras/stt1274
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Study Approach
Quantitative