TY - JOUR
T1 - Galaxy and Mass Assembly (GAMA)
T2 - fine filaments of galaxies detected within voids
AU - Alpaslan, Mehmet
AU - Robotham, Aaron S. G.
AU - Obreschkow, Danail
AU - Penny, Samantha
AU - Driver, Simon
AU - Norberg, Peder
AU - Brough, Sarah
AU - Brown, Michael
AU - Cluver, Michelle
AU - Holwerda, Benne
AU - Hopkins, Andrew M.
AU - Kampen, Eelco van
AU - Kelvin, Lee S.
AU - Lara-Lopez, Maritza A.
AU - Liske, Jochen
AU - Loveday, Jon
AU - Mahajan, Smriti
AU - Pimbblet, Kevin
PY - 2014/5/1
Y1 - 2014/5/1
N2 - 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.
AB - 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.
KW - Methods: data analysis
KW - Surverys
KW - Large-scale structure of the Universe
U2 - 10.1093/mnrasl/slu019
DO - 10.1093/mnrasl/slu019
M3 - Article
SN - 1745-3925
VL - 440
SP - L106-L110
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 1
ER -