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.author | Abraham, Roberto | |
---|---|---|
dc.contributor.author | Ellis, Richard | |
dc.contributor.author | Brinchmann, Jarle | |
dc.contributor.author | Schade, David | |
dc.contributor.author | Tresse, Laurence | |
dc.contributor.author | Colless, Matthew | |
dc.contributor.author | Le Fevre, Oliver | |
dc.contributor.author | Lilly, Simon | |
dc.date.accessioned | 2003-04-03 | |
dc.date.accessioned | 2004-05-19T04:07:19Z | |
dc.date.accessioned | 2011-01-05T08:53:22Z | |
dc.date.available | 2004-05-19T04:07:19Z | |
dc.date.available | 2011-01-05T08:53:22Z | |
dc.date.created | 2000 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/1885/40000 | |
dc.identifier.uri | http://digitalcollections.anu.edu.au/handle/1885/40000 | |
dc.description.abstract | 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 ~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.extent | 469595 bytes | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | Blackwell Publishing Ltd | |
dc.source | Monthly Notices of the Royal Astronomical Society | |
dc.subject | galaxies: evolution - galaxies: interactions - cosmology: observations | |
dc.title | 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 | |
dc.type | Journal article | |
local.description.refereed | yes | |
local.identifier.citationmonth | jan | |
local.identifier.citationpages | 565-575 | |
local.identifier.citationpublication | Royal Astronomical Society, Monthly Notices | |
local.identifier.citationvolume | 311 | |
local.identifier.citationyear | 2000 | |
local.identifier.eprintid | 1124 | |
local.rights.ispublished | yes | |
dc.date.issued | 2000 | |
local.identifier.absfor | 020110 - Stellar Astronomy and Planetary Systems | |
local.identifier.ariespublication | MigratedxPub19120 | |
local.type.status | Published Version | |
local.contributor.affiliation | Le Fevre, O, CNRS | |
local.contributor.affiliation | Abraham, R, University of Cambridge | |
local.contributor.affiliation | Lilly, S J, University of Toronto | |
local.contributor.affiliation | Ellis, Richard S, California Institute of Technology | |
local.contributor.affiliation | Brinchmann, J, University of Cambridge | |
local.contributor.affiliation | Schade, D, Dominion Astrophysical Observatory | |
local.contributor.affiliation | Tresse, L, CNRS | |
local.contributor.affiliation | Colless, Matthew, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Crampton, D, Dominion Astrophysical Observatory | |
local.contributor.affiliation | Glazebrook, Karl, Johns Hopkins University | |
local.contributor.affiliation | Hammer, F, Observatoire de Paris | |
local.contributor.affiliation | Broadhurst, T, Tel Aviv University | |
local.bibliographicCitation.startpage | 565 | |
local.bibliographicCitation.lastpage | 575 | |
dc.date.updated | 2015-12-12T08:46:09Z | |
Collections | ANU Research Publications |
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