Avoid galaxy is agalaxy located in acosmological void.[1] Few galaxies exist in voids; most are located insheets, 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 formpoor 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]
It is theorised by many astrophysicists that void galaxies are the result of largegalactic filaments being pulled by the gravity of a majorsuper cluster out of the less densely populated areas, causing voids such as theBoötes Void to grow. Galaxies such as MCG+01-02-015 are sometimes left behind from such events.[8]
^Rien van de Weygaert; Platen, Erwin; Tigrak, Esra; Hidding, Johan; Thijs van der Hulst; Aragon-Calvo, Miguel A.; Stanonik, Kathryn; Jacqueline van Gorkom (17 December 2009). "The Cosmically Depressed: Life, Sociology and Identity of Voids".Galaxies in Isolation: Exploring Nature Versus Nurture.421: 99.arXiv:0912.3473v1.Bibcode:2010ASPC..421...99V.
^Kuhn, B.; Hopp, U.; Elsaesser, H. (February 1997). "Results of a search for faint galaxies in voids".Astronomy and Astrophysics.318:405–415.Bibcode:1997A&A...318..405K.ISSN0004-6361.
^abcdefghiKim, Chulhee; Boller, Th.; Ghosh, Kajal K.; Swartz, Douglas A.; Ramsey, Brian D. (January 2001). "Detection of X-Ray Emission from Galaxies inside the Bootes Void".The Astrophysical Journal.546 (2):L91 –L95.Bibcode:2001ApJ...546L..91K.doi:10.1086/318868.
^abcdefCruzen, Shawn; Wehr, Tara; Weistrop, Donna; Angione, Ronald J.; Hoopes, Charles (January 2002). "Spectroscopy of Galaxies in the Bootes Void".The Astronomical Journal.123 (1):142–158.Bibcode:2002AJ....123..142C.doi:10.1086/324739.
^Tully, Brent."The Local Void"(PDF).AMIGA - Analysis of the interstellar Medium of Isolated Galaxies. Archived fromthe original(PDF) on 15 December 2009.
