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

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arxiv 1401.7331 v1 pith:ZZVKFGNU submitted 2014-01-28 astro-ph.CO

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

classification astro-ph.CO
keywords galaxiestendrilsfilamentsgalaxygamanumbersurveyvoids
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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 6 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 SDSS-DR7 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, that may be defined as `void galaxies,' will have local galaxy number densities that depend on such observational limits and are likely higher than can be directly measured.

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