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Galaxy and Mass Assembly (GAMA) : fine filaments of galaxies detected within voids

Robotham, Aaron S. G.; Holwerda, Benne; Alpaslan, Mehmet; Robotham, Aaron S.G.; Obreschkow, Danail; Penny, Samantha; Driver, Simon; Norberg, Peder; Brough, Sarah; Brown, Michael; Cluver, Michelle; Holwerda, Benne Willem; Hopkins, Andrew M.; van Kampen, Eelco; Kelvin, Lee S.; Lara-Lopez, Maritza A.; Liske, Jochen; Loveday, Jon; Mahajan, Smriti; Pimbblet, Kevin

Authors

Aaron S. G. Robotham

Benne Holwerda

Mehmet Alpaslan

Aaron S.G. Robotham

Danail Obreschkow

Samantha Penny

Simon Driver

Peder Norberg

Sarah Brough

Michael Brown

Michelle Cluver

Benne Willem Holwerda

Andrew M. Hopkins

Eelco van Kampen

Lee S. Kelvin

Maritza A. Lara-Lopez

Jochen Liske

Jon Loveday

Smriti Mahajan

Abstract

Based on data from the Galaxy and Mass Assembly (GAMA) survey, we report on the discovery of structures that we refer to as ‘tendrils’ of galaxies: coherent, thin chains of galaxies that are rooted in filaments and terminate in neighbouring filaments or voids. On average, tendrils contain six galaxies and span 10 h¯¹ Mpc. We use the so-called line correlation function to prove that tendrils represent real structures rather than accidental alignments. We show that voids found in the Sloan Digital Sky Survey, 7th data release survey that overlap with GAMA regions contain a large number of galaxies, primarily belonging to tendrils. This implies that void sizes are strongly dependent on the number density and sensitivity limits of a survey. We caution that galaxies in low-density regions, which may be defined as ‘void galaxies,’ will have local galaxy number densities that depend on such observational limits and are likely higher than those can be directly measured.

Journal Article Type Article
Publication Date May 1, 2014
Journal Monthly notices of the Royal Astronomical Society Letters
Electronic ISSN 1745-3933
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 440
Issue 1
Pages L106-L110
Institution Citation Alpaslan, M., Robotham, A. S., Obreschkow, D., Penny, S., Driver, S., Norberg, P., …Pimbblet, K. (2014). Galaxy and Mass Assembly (GAMA) : fine filaments of galaxies detected within voids. Monthly notices of the Royal Astronomical Society. Letters, 440(1), L106-L110. https://doi.org/10.1093/mnrasl/slu019
DOI https://doi.org/10.1093/mnrasl/slu019
Keywords Methods -- data analysis, Surveys, Large-scale structure of Universe
Publisher URL http://mnrasl.oxfordjournals.org/content/440/1/L106.abstract?sid=6aa90e21-0d1b-4ebc-80d9-c00a3f4c92d8
Additional Information This article has been accepted for publication in Monthly notices of the Royal Astronomical Society Letters ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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