Fakultät für Physik und Astronomie
STEPHEN PHILLIPS hostreviews.co.uk / UNSPLASH

Galaxies in voids: observational perspective

Evgeniya Egorova , Lomonosov Moscow State University, Sternberg Astronomical Institute

Voids are low density regions in the Large Scale structure of the Universe. Due to the specific conditions, they are very well suited for the study of some fundamental questions: the search for predicted delayed galaxies, the study of galaxy evolution and star formation in extreme isolation, search for and study episodes of gas accretion onto galaxies, from companions or from gaseous filaments. According to the previous studies, voids contain the sizable fraction of gas-rich extremely metal-poor dwarf galaxies with metallicities of Z = (1/50-1/20) Z_solar. Their overall properties suggest their probable early stage of evolution. Therefore, they can be good real counterparts for predicted in recent simulations the Very Young Galaxies. Voids are considered as regions where the cold pristine gas accretion from large-scale filaments can still proceed. This may increase probability to find such unusual objects in the early stages of evolution. In order to get the most complete picture, it is worth studying void galaxies with various methods and approaches. In our analysis we use the optical spectral and photometrical data, ionized gas kinematics, as well as mapping of HI in the 21 cm line. I will present our study of processes affecting the evolution of void galaxies and the project on search for candidates to Very Young Galaxies. At the moment this project results in discovery of 10 new gas-rich XMP dwarfs with Z < 1/30 Z_solar.

ARI Institute Colloquium
8 Jul 2021, 11:15
ARI, Moenchhofstrasse 12-14, Seminarraum 1, 1.OG

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