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Introducing the Illustris project: The evolution of galaxy populations across cosmic time

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cam.issuedOnline2014-09-24
dc.contributor.authorGene, S
dc.contributor.authorVogelsberger, M
dc.contributor.authorSpringel, V
dc.contributor.authorSijacki, D
dc.contributor.authorNelson, D
dc.contributor.authorSnyder, G
dc.contributor.authorRodriguez-Gomez, V
dc.contributor.authorTorrey, P
dc.contributor.authorHernquist, L
dc.contributor.orcidSijacki, Debora [0000-0002-3459-0438]
dc.date.accessioned2018-11-01T14:03:42Z
dc.date.available2018-11-01T14:03:42Z
dc.date.issued2014
dc.description.abstractWe present an overview of galaxy evolution across cosmic time in the Illustris simulation. Illustris is an N-body/hydrodynamical simulation that evolves 2 × 18203resolution elements in a (106.5Mpc)3box from cosmological initial conditions down to z = 0 using the AREPO moving-mesh code. The simulation uses a state-of-the-art set of physical models for galaxy formation that was tuned to reproduce the z = 0 stellar mass function and the history of the cosmic star formation rate density. We find that Illustris successfully reproduces a plethora of observations of galaxy populations at various redshifts, for which no tuning was performed, and provide predictions for future observations. In particular, we discuss (a) the buildup of galactic mass, showing stellar mass functions and the relations between stellar mass and halo mass from z = 7 to 0, (b) galaxy number density profiles around massive central galaxies out to z = 4, (c) the gas and total baryon content of both galaxies and their haloes for different redshifts, and as a function of mass and radius, and (d) the evolution of galaxy specific star formation rates up to z = 8. In addition, we (i) present a qualitative analysis of galaxy morphologies from z = 5 to 0, for the stellar as well as the gaseous components, and their appearance in Hubble Space Telescope mock observations, (ii) follow galaxies selected at z = 2 to their z = 0 descendants, and quantify their growth and merger histories, and (iii) track massive z = 0 galaxies to high redshift and study their joint evolution in star formation activity and compactness. We conclude with a discussion of several disagreements with observations, and lay out possible directions for future research.
dc.identifier.doi10.17863/CAM.31901
dc.identifier.eissn1365-2966
dc.identifier.issn1365-2966
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/284526
dc.language.isoeng
dc.publisherOxford University Press
dc.publisher.urlhttp://dx.doi.org/10.1093/mnras/stu1654
dc.rightsAll rights reserved
dc.subjecthydrodynamics
dc.subjectmethods: numerical
dc.subjectgalaxies: evolution
dc.subjectgalaxies: formation
dc.subjectgalaxies: high-redshift
dc.subjectcosmology: theory
dc.titleIntroducing the Illustris project: The evolution of galaxy populations across cosmic time
dc.typeArticle
dcterms.dateAccepted2014-08-11
prism.endingPage200
prism.issueIdentifier1
prism.publicationNameMonthly Notices of the Royal Astronomical Society
prism.startingPage175
prism.volume445
pubs.funder-project-idScience and Technology Facilities Council (ST/L000725/1)
rioxxterms.licenseref.startdate2014-08-11
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1093/mnras/stu1654

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