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

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posted on 2023-06-08, 21:14 authored by Mehmet Alpaslan, Aaron S G Robotham, Danail Obreschkow, Samantha Penny, Simon Driver, Peder Norberg, Sarah Brough, Michael Brown, Michelle Cluver, Benne Holwerda, Andrew M Hopkins, Eelco van Kampen, Lee S Kelvin, Maritza A Lara-Lopez, Jochen Liske, Jonathan LovedayJonathan Loveday, Smriti Mahajan, Kevin Pimbblet
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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society: Letters

ISSN

1745-3925

Publisher

Oxford University Press

Issue

1

Volume

440

Page range

L106-L110

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2015-06-24

First Open Access (FOA) Date

2015-06-24

First Compliant Deposit (FCD) Date

2015-06-24

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