1. H i studies of extremely metal-poor dwarfs in voids – I.
- Author
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Kurapati, Sushma, Pustilnik, Simon A, and Egorova, Evgeniya S
- Subjects
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LARGE scale structure (Astronomy) , *DWARF galaxies , *GALACTIC evolution , *RADIO lines , *RADIO galaxies - Abstract
We present and discuss the results of the Giant Metrewave Radio Telescope H i 21-cm line mapping for five isolated low-mass (M |$_{\rm bary}$| |$\sim$| (2–8) |$\times 10^7$| M |$\odot$|) eXtremely Metal Poor dwarfs [12+ |$\log$| (O/H) = 7.13–7.28], selected from the nearby void galaxy sample. All the studied void dwarfs show disturbed morphology in the H i maps with the angular resolutions of |$\sim 11$| to |$\sim 40\,{\rm arcsec}$|. We examine the H i 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. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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