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Very gas-rich extremely metal-poor blue void dwarfs

Published online by Cambridge University Press:  30 October 2019

Simon A. Pustilnik ,
Yulia A. Perepelitsyna ,
Alexei Y. Kniazev ,
Evgeniya S. Egorova  and
Jayaram N. Chengalur
Simon A. Pustilnik
Affiliation:
Special Astrophysical Observatory of RAS, 369167, Nizhnij Arkhyz, Karachai-Circessia, Russia emails: sap@sao.ru, jlyamina@yandex.ru
Yulia A. Perepelitsyna
Affiliation:
Special Astrophysical Observatory of RAS, 369167, Nizhnij Arkhyz, Karachai-Circessia, Russia emails: sap@sao.ru, jlyamina@yandex.ru
Alexei Y. Kniazev
Affiliation:
South African Astronomical Observatory, 1 Observatory road, Observatory, 7935 Cape Town, South Africa email: akniazev@saao.ac.sa Sternberg Astronomical Institute of Moscow State University, Universitetsky Pr. 13, Moscow, Russia email: eshaldenkova@gmail.com
Evgeniya S. Egorova
Affiliation:
Sternberg Astronomical Institute of Moscow State University, Universitetsky Pr. 13, Moscow, Russia email: eshaldenkova@gmail.com
Jayaram N. Chengalur
Affiliation:
National Centre for Radio Astronomy (TIFR), Postbag 3, Ganeshkind, Pune 411007, India email: chengalur@ncra.tifr.res.in
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Abstract

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Half-dozen of extreme representatives of void dwarf galaxy population were found in our study of evolutionary status of a hundred galaxies in the nearby Lynx-Cancer void. They are very gas-rich, extremely low-metallicity [7.0 < 12 + log(O/H) < ∼ 7.3] objects, with blue colours of outer parts. The colours indicate the ages of the oldest visible stellar population of one to a few Gyr. They all are intrinsically faint, mostly Low Surface Brightness dwarfs, with MB range of –9.5m to –14m. Thus, their finding is a subject of the severe observational selection. The recent advancement in search for such objects in other nearby voids resulted in doubled their total number. We summarize all available data on this group of unusual void dwarf galaxies and discuss them in the general context of very low metallicity galaxies and their possible formation and evolutionary scenarios.

Keywords

galaxies: dwarfgalaxies: formationgalaxies: evolutiongalaxies: generallarge-scale structure of universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 400 - 403
Copyright
© International Astronomical Union 2019 

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