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

Understand

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.