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Wiley, Monthly Notice- Royal Astronomical Society -Letters-, 1(440), p. L106-L110

DOI: 10.1093/mnrasl/slu019

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

Journal article published in 2014 by Mehmet Alpaslan ORCID, Aaron S. G. Robotham, Danail Obreschkow, Samantha Penny, Simon Driver ORCID, Peder Norberg ORCID, Sarah Brough, Michael Brown ORCID, Michelle Cluver, Benne W. Holwerda, Andrew M. Hopkins, Eelco van Kampen, Eelco van Kampen, Lee S. Kelvin, Maritza A. Lara-Lopez ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.