Very metal-poor galaxies: ionized gas kinematics in nine objects
A.V. Moiseev (1), S.A. Pustilnik (1), A.Y. Kniazev (2) ((1)SAO,, Russia, (2)SAAO, South Africa)

TL;DR
This study investigates the ionized gas kinematics in nine extremely metal-deficient galaxies, revealing disturbed gas morphology and evidence of interactions or mergers that likely trigger star formation, providing insights into early galaxy evolution.
Contribution
It offers new observational data on gas kinematics in XMD galaxies, highlighting the role of interactions in star formation, and includes analysis of two additional dwarf galaxies affected by mergers.
Findings
Most XMD dwarfs show disturbed gas morphology and kinematics.
Interactions and mergers are linked to enhanced star formation.
Data for two dwarf galaxies suggest interaction-induced star formation.
Abstract
The study of ionized gas morphology and kinematics in nine eXtremely Metal-Deficient (XMD) galaxies with the scanning Fabry-Perot interferometer on the SAO 6-m telescope is presented. Some of these very rare objects (with currently known range of O/H of 7.12 < 12+log(O/H) < 7.65, or Zo/35 < Z < Zo/10) are believed to be the best proxies of `young' low-mass galaxies in the high-redshift Universe. One of the main goals of this study is to look for possible evidence of star formation (SF) activity induced by external perturbations. Recent results from HI mapping of a small subsample of XMD star-forming galaxies provided confident evidence for the important role of interaction-induced SF. Our observations provide complementary or new information that the great majority of the studied XMD dwarfs have strongly disturbed gas morphology and kinematics or the presence of detached components. We…
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