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arXiv · 2312.03599

HI Studies of Extremely Metal Poor Dwarfs in Voids -- I

Sushma Kurapati·Simon A. Pustilnik·Evgeniya S. Egorova
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Abstract

We present and discuss the results of the Giant Metrewave Radio Telescope (GMRT) HI 21-cm line mapping for five isolated low-mass (M_bary ~(2--8)*10^7 Mo) eXtremely Metal Poor (XMP) dwarfs [12+log(O/H)=7.13-7.28], selected from the Nearby Void Galaxy (NVG) sample. All the studied void dwarfs show the disturbed morphology in the HI maps with the angular resolutions of ~11" to ~40". We examine the HI morphology and velocity field and the relative orientation of their stellar and gas body spins. We discuss the overall non-equilibrium state of their gas and the possible origin and evolution of the studied void dwarfs. The most straightforward interpretation of the ubiquitous phenomenon of the gas component non-equilibrium state in these and similar void dwarfs is the cold accretion from the void filaments and/or minor mergers. The cold gas accretion in voids could be linked to the presence of small filaments that constitute the substructure of voids.

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Sushma Kurapati, Simon A. Pustilnik, Evgeniya S. Egorova. 2023-12-06. HI Studies of Extremely Metal Poor Dwarfs in Voids -- I. https://arxiv.org/abs/2312.03599

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