Void galaxy

A void galaxy is a galaxy located in a cosmological void.^[1] Few galaxies exist in voids; most are located in sheets, walls and filaments that surround voids and supervoids.^[2][3] Many void galaxies are connected through void filaments^[4] or tendrils,^[5] less massive versions of the regular galaxy filaments that surround voids. These filaments are often straighter than their non-void counterparts due to the lack of influence by surrounding filaments.^[4] These filaments can even be rich enough to form poor galaxy clusters.^[6] The void galaxies themselves are thought to represent pristine examples of galactic evolution, having few neighbours, and likely to have formed from pure intergalactic gas.^[7]

Formation

It is theorised by many astrophysicists that void galaxies are the result of large galactic filaments being pulled by the gravity of a major super cluster out of the less densely populated areas, causing voids such as the Boötes Void to grow. Galaxies such as MCG+01-02-015 are sometimes left behind from such events.^[8]

List of void galaxies

Galaxy	Void	Filament	Notes	Comments
PC 1357+4641	Boötes Void		[9]	Emission-line galaxy
IRAS 14288+5255			[9]	AGN X-ray source
G 1432+5302			[10]	Starburst galaxy
G 1458+4944			[10]	LINER galaxy
G 1507+4554			[10]	Starburst galaxy
G 1510+4727A & G 1510+4727B			[10]	Interacting galaxy pair
BHI 1514+3819			[9]
FSS 1515+3823			[9]
G 1517+3949			[10]	Starburst galaxy
G 1517+3956A & G 1517+3956B			[10]	Interacting galaxy pair
IRAS 15195+5050			[9]	AGN X-ray source
Markarian 845			[9]	Seyfert 1 (X-ray source)
CG 547			[9]	Emission-line Galaxy
CG 637			[9]
CG 922			[9]
MCG +01-02-015	0049+05 Void		[11][12][13][14]	LEDA 1852 (Pisces)
Pisces A	Local Void		[15]
Pisces B			[15]
NGC 7077			[16]
NGC 6503
NGC 6789

See also

• Field galaxy