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Post Info TOPIC: VGS_31
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Void galaxy trio aligns with dark filament 

Abandoned in a cold, dark void in space, three galaxies eke out a lonely existence. Far from the hustle and bustle of a galactic cluster, the remote trio are snuggled under a shared blanket of hydrogen gas and seem to be clinging to a rope of invisible dark matter. 
They are much more than a curious outpost in an otherwise barren landscape. Their growth has been stunted by a starvation diet of gaseous morsels, one that has preserved them in an early stage of development rarely seen in more common cluster galaxies. And because they are so remote, they are the perfect candidate to test models of how galaxies in general evolve. 
The trio, collectively known as VGS_31, were discovered by Burcu Beygu of the Kapteyn Astronomical Institute at the University of Groningen in the Netherlands and colleagues, who hunt for galaxies in the emptiest corners of the universe as part of their void galactic survey, or VGS. The team studied 60 such void galaxies, but the VGS_31 group stood out due to its linked structure. 
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Title: An Interacting Galaxy System Along a Filament in a Void
Authors: B. Beygu, K. Kreckel, R. van de Weygaert, J. M. van der Hulst, J. H. van Gorkom

Cosmological voids provide a unique environment for the study of galaxy formation and evolution. The galaxy population in their interior have significantly different properties than average field galaxies. As part of our Void Galaxy Survey (VGS), we have found a system of three interacting galaxies (VGS_31) inside a large void. VGS_31 is a small elongated group whose members are embedded in a common HI envelope. The HI picture suggests a filamentary structure with accretion of intergalactic cold gas from the filament onto the galaxies. We present deep optical and narrow band H_alpha data, optical spectroscopy, near-UV and far-UV GALEX and CO(1-0) data. We find that one of the galaxies, a Markarian object, has a ring-like structure and a tail evident both in optical and HI. While all three galaxies form stars in their central parts, the tail and the ring of the Markarian object are devoid of star formation. We discuss these findings in terms of a gravitational interaction and ongoing growth of galaxies out of a filament. VGS_31 is one of the first observed examples of a filamentary structure in a void. It is an important prototype for understanding the formation of substructure in a void. This system also shows that the galaxy evolution in voids can be as dynamic as in high density environments.

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