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Hubble Space Telescope imaging of the CFRS and LDSS redshift surveys - IV. Influence of mergers in the evolution of faint field galaxies from z~1

Abraham, Roberto; Ellis, Richard; Brinchmann, Jarle; Schade, David; Tresse, Laurence; Colless, Matthew; Le Fevre, Oliver; Lilly, Simon

Description

Hubble Space Telescope images of a sample of 285 galaxies with measured redshifts from the Canada-France Redshift Survey (CFRS) and Autofib-Low Dispersion Spectrograph Survey (LDSS) redshift surveys are analysed to derive the evolution of the merger fraction out to redshifts z~1. We have performed visual and machine-based merger identifications, as well as counts of bright pairs of galaxies with magnitude differences δm<=1.5mag. We find that the pair fraction increases with redshift, with up to...[Show more]

dc.contributor.authorAbraham, Roberto
dc.contributor.authorEllis, Richard
dc.contributor.authorBrinchmann, Jarle
dc.contributor.authorSchade, David
dc.contributor.authorTresse, Laurence
dc.contributor.authorColless, Matthew
dc.contributor.authorLe Fevre, Oliver
dc.contributor.authorLilly, Simon
dc.date.accessioned2003-04-03
dc.date.accessioned2004-05-19T04:07:19Z
dc.date.accessioned2011-01-05T08:53:22Z
dc.date.available2004-05-19T04:07:19Z
dc.date.available2011-01-05T08:53:22Z
dc.date.created2000
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/40000
dc.identifier.urihttp://digitalcollections.anu.edu.au/handle/1885/40000
dc.description.abstractHubble Space Telescope images of a sample of 285 galaxies with measured redshifts from the Canada-France Redshift Survey (CFRS) and Autofib-Low Dispersion Spectrograph Survey (LDSS) redshift surveys are analysed to derive the evolution of the merger fraction out to redshifts z~1. We have performed visual and machine-based merger identifications, as well as counts of bright pairs of galaxies with magnitude differences δm<=1.5mag. We find that the pair fraction increases with redshift, with up to ~20per cent of the galaxies being in physical pairs at z~0.75-1. We derive a merger fraction varying with redshift as ~(1+z)3.2+/-0.6, after correction for line-of-sight contamination, in excellent agreement with the merger fraction derived from the visual classification of mergers for which m=3.4+/-0.6. After correcting for seeing effects on the ground-based selection of survey galaxies, we conclude that the pair fraction evolves as ~(1+z)2.7+/-0.6. This implies that an average L* galaxy will have undergone 0.8-1.8 merger events from z=1 to z=0, with 0.5 to 1.2 merger events occuring in a 2-Gyr time-span at around z~0.9. This result is consistent with predictions from semi-analytical models of galaxy formation. From the simple coaddition of the observed luminosities of the galaxies in pairs, physical mergers are computed to lead to a brightening of 0.5mag for each pair on average, and a boost in star formation rate of a factor of 2, as derived from the average [Oii] equivalent widths. Mergers of galaxies are therefore contributing significantly to the evolution of both the luminosity function and luminosity density of the Universe out to z~1.
dc.format.extent469595 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectgalaxies: evolution - galaxies: interactions - cosmology: observations
dc.titleHubble Space Telescope imaging of the CFRS and LDSS redshift surveys - IV. Influence of mergers in the evolution of faint field galaxies from z~1
dc.typeJournal article
local.description.refereedyes
local.identifier.citationmonthjan
local.identifier.citationpages565-575
local.identifier.citationpublicationRoyal Astronomical Society, Monthly Notices
local.identifier.citationvolume311
local.identifier.citationyear2000
local.identifier.eprintid1124
local.rights.ispublishedyes
dc.date.issued2000
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub19120
local.type.statusPublished Version
local.contributor.affiliationLe Fevre, O, CNRS
local.contributor.affiliationAbraham, R, University of Cambridge
local.contributor.affiliationLilly, S J, University of Toronto
local.contributor.affiliationEllis, Richard S, California Institute of Technology
local.contributor.affiliationBrinchmann, J, University of Cambridge
local.contributor.affiliationSchade, D, Dominion Astrophysical Observatory
local.contributor.affiliationTresse, L, CNRS
local.contributor.affiliationColless, Matthew, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationCrampton, D, Dominion Astrophysical Observatory
local.contributor.affiliationGlazebrook, Karl, Johns Hopkins University
local.contributor.affiliationHammer, F, Observatoire de Paris
local.contributor.affiliationBroadhurst, T, Tel Aviv University
local.bibliographicCitation.startpage565
local.bibliographicCitation.lastpage575
dc.date.updated2015-12-12T08:46:09Z
CollectionsANU Research Publications

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