The neutral hydrogen content of galaxies in cosmological hydrodynamic simulations

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dc.contributor.authorDave, Romeel
dc.contributor.authorKatz, Neal
dc.contributor.authorOppenheimer, Benjamin D.
dc.contributor.authorKollmeier, Juna A.
dc.contributor.authorWeinberg, David H.
dc.date.accessioned2017-07-14T09:31:09Z
dc.date.available2017-07-14T09:31:09Z
dc.date.issued2013
dc.description.abstractWe 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 (σ <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.en_US
dc.description.accreditationDepartment of HE and Training approved list
dc.identifier.citationDave, R. et al. (2013). The neutral hydrogen content of galaxies in cosmological hydrodynamic simulations. Monthly Notices of the Royal Astronomical Society, 434: 2645–2663en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/3083
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.rightsPublisher retains copyright. Authors may archive the published version in their institutional repository.
dc.source.urihttp://dx.doi.org/10.1093/mnras/stt1274
dc.subjectISMen_US
dc.subjectAtoms – galaxiesen_US
dc.subjectAbundances – galaxiesen_US
dc.subjectEvolution – galaxiesen_US
dc.subjectFormation – galaxiesen_US
dc.titleThe neutral hydrogen content of galaxies in cosmological hydrodynamic simulationsen_US
dc.typeArticleen_US

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