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A consistent measure of the merger histories of massive galaxies using close-pair statistics I: Major mergers at z < 3:5

Mundy, Carl J.; Conselice, Christopher J.; Duncan, Kenneth J.; Almaini, Omar; Häußler, Boris; Hartley, William G.

Authors

Carl J. Mundy

Christopher J. Conselice

Kenneth J. Duncan

Omar Almaini

Boris Häußler

William G. Hartley



Abstract

We use a large sample of ∼350,000 galaxies constructed by combining the UKIDSS UDS, VIDEO/CFHT-LS, UltraVISTA/COSMOS and GAMA survey regions to probe the major merging histories of massive galaxies (>1010 M⊙) at 0.00510−4 Mpc−3, and find rates a factor of 2-3 smaller than previous works, although this depends strongly on the assumed merger timescale and likelihood of a close-pair merging. Galaxies undergo approximately 0.5 major mergers at z1011M⊙) galaxies have experienced a steady supply of stellar mass via major mergers throughout their evolution. While pair fractions are found to agree with those predicted by the Henriques et al. (2014) semi-analytic model, the Illustris hydrodynamical simulation fails to quantitatively reproduce derived merger rates. Furthermore, we find major mergers become a comparable source of stellar mass growth compared to star-formation at z

Journal Article Type Article
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
APA6 Citation Mundy, C. J., Conselice, C. J., Duncan, K. J., Almaini, O., Häußler, B., & Hartley, W. G. (in press). A consistent measure of the merger histories of massive galaxies using close-pair statistics I: Major mergers at z < 3:5. Monthly Notices of the Royal Astronomical Society, ISSN 0035-8711
Keywords galaxies: evolution - galaxies: formation - galaxies: high-redshift
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information

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