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dc.contributor.authorTojeiro, Rita
dc.contributor.authorEardley, Elizabeth
dc.contributor.authorPeacock, John A.
dc.contributor.authorNorberg, Peder
dc.contributor.authorAlpaslan, Mehmet
dc.contributor.authorDriver, Simon P.
dc.contributor.authorHenriques, Bruno
dc.contributor.authorHopkins, Andrew M.
dc.contributor.authorKafle, Prajwal R.
dc.contributor.authorRobotham, Aaron S. G.
dc.contributor.authorThomas, Peter
dc.contributor.authorTonini, Chiara
dc.contributor.authorWild, Vivienne
dc.date.accessioned2017-07-04T15:30:09Z
dc.date.available2017-07-04T15:30:09Z
dc.date.issued2017-09
dc.identifier.citationTojeiro , R , Eardley , E , Peacock , J A , Norberg , P , Alpaslan , M , Driver , S P , Henriques , B , Hopkins , A M , Kafle , P R , Robotham , A S G , Thomas , P , Tonini , C & Wild , V 2017 , ' Galaxy and Mass Assembly (GAMA) : halo formation times and halo assembly bias on the cosmic web ' , Monthly Notices of the Royal Astronomical Society , vol. 470 , no. 3 , pp. 3720-3741 . https://doi.org/10.1093/mnras/stx1466en
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 249426895
dc.identifier.otherPURE UUID: fcac694b-7c94-4e30-9c3b-98d13e83c3e4
dc.identifier.otherBibCode: 2016arXiv161208595T
dc.identifier.otherScopus: 85035763280
dc.identifier.otherWOS: 000406844800082
dc.identifier.urihttps://hdl.handle.net/10023/11145
dc.descriptionRT acknowledges support from the Science and Technology Facilities Council via an Ernest Rutherford Fellowship (grant number ST/K004719/1). VW and EE acknowledge support of the European Research Council via the award of a starting grant (SEDMorph; P.I. V. Wild). PAT (ORCID 0000-0001-6888-6483) acknowledges support from the Science and Technology Facilities Council (grant number ST/L000652/1).en
dc.description.abstractWe present evidence for halo assembly bias as a function of geometric environment (GE). By classifying GAMA galaxy groups as residing in voids, sheets, filaments or knots using a tidal tensor method, we find that low-mass haloes that reside in knots are older than haloes of the same mass that reside in voids. This result provides direct support to theories that link strong halo tidal interactions with halo assembly times. The trend with geometric environment is reversed at large halo mass, with haloes in knots being younger than haloes of the same mass in voids. We find a clear signal of halo downsizing - more massive haloes host galaxies that assembled their stars earlier. This overall trend holds independently of GE. We support our analysis with an in-depth exploration of the L-Galaxies semi-analytic model, used here to correlate several galaxy properties with three different definitions of halo formation time. We find a complex relationship between halo formation time and galaxy properties, with significant scatter. We confirm that stellar mass to halo mass ratio, specific star formation rate (SFR) and mass-weighed age are reasonable proxies of halo formation time, especially at low halo masses. Instantaneous SFR is a poor indicator at all halo masses. Using the same semi-analytic model, we create mock spectral observations using complex star-formation and chemical enrichment histories, which approximately mimic GAMA's typical signal-to-noise ratio and wavelength range. We use these mocks to assert how well potential proxies of halo formation time may be recovered from GAMA-like spectroscopic data.
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rightsCopyright © 2017, the Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/stx1466en
dc.subjectGalaxies: haloesen
dc.subjectCosmology: observationen
dc.subjectLarge-scale structure of the Universeen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subject3rd-DASen
dc.subjectBDCen
dc.subjectR2Cen
dc.subject.lccQBen
dc.subject.lccQCen
dc.titleGalaxy and Mass Assembly (GAMA) : halo formation times and halo assembly bias on the cosmic weben
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.sponsorEuropean Research Councilen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.identifier.doihttps://doi.org/10.1093/mnras/stx1466
dc.description.statusPeer revieweden
dc.identifier.urlhttp://adsabs.harvard.edu/abs/2016arXiv161208595Ten
dc.identifier.grantnumberST/K004719/1en
dc.identifier.grantnumberERC-2012-StG-20111012en


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