Galaxy and mass assembly (GAMA): The large-scale structure of galaxies and comparison to mock universes

M. Alpaslan, Aaron Robotham, Simon Driver, P. Norberg, I.K. Baldry, A.E. Bauer, J. Bland-Hawthorn, M.J.I. Brown, M.E. Cluver, M. Colless, C. Foster, A.M. Hopkins, E. Van Kampen, L.S. Kelvin, M.A. Lara-López, J. Liske, A.R. López-Sánchez, J.N. Loveday, T. Mcnaught-Roberts, A.I. MersonK.A. Pimbblet

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

From a volume-limited sample of 45 542 galaxies and 6000 groups with z ≤ 0.213, we use an adapted minimal spanning tree algorithm to identify and classify large-scale structures within the Galaxy And Mass Assembly (GAMA) survey. Using galaxy groups, we identify 643 filaments across the three equatorial GAMA fields that span up to 200 h-1 Mpc in length, each with an average of eight groups within them. By analysing galaxies not belonging to groups, we identify a secondary population of smaller coherent structures composed entirely of galaxies, dubbed 'tendrils' that appear to link filaments together, or penetrate into voids, generally measuring around 10 h-1 Mpc in length and containing on average six galaxies. Finally, we are also able to identify a population of isolated void galaxies. By running this algorithm on GAMA mock galaxy catalogues, we compare the characteristics of large-scale structure between observed and mock data, finding that mock filaments reproduce observed ones extremely well. This provides a probe of higher order distribution statistics not captured by the popularly used two-point correlation function. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Original languageEnglish
Pages (from-to)177-194
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume438
Issue number1
Early online date14 Dec 2013
DOIs
Publication statusPublished - 11 Feb 2014

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