Papers › The Stellar Kinematics of Void Dwarf Galaxies Using KCWI
The Stellar Kinematics of Void Dwarf Galaxies Using KCWI
Mithi A. C. de los Reyes, Evan N. Kirby, Zhuyun Zhuang, Charles C. Steidel, Yuguang Chen, Coral Wheeler
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Dwarf galaxies located in extremely under-dense cosmic voids are excellent test-beds for disentangling the effects of large-scale environment on galaxy formation and evolution. We present integral field spectroscopy for low-mass galaxies (M_⋆=10⁷-10⁹ M_⊙) located inside (N=21) and outside (N=9) cosmic voids using the Keck Cosmic Web Imager (KCWI). Using measurements of stellar line-of-sight rotational velocity vᵣₒₜ and velocity dispersion σ_⋆, we test the tidal stirring hypothesis, which posits that dwarf spheroidal galaxies are formed through tidal interactions with more massive host galaxies. We measure low values of vᵣₒₜ/σ_⋆≲2 for our sample of isolated dwarf galaxies, and we find no trend between vᵣₒₜ/σ_⋆ and distance from a massive galaxy d_(L^⋆) out to d_(L^⋆)∼10 Mpc. These suggest that dwarf galaxies can become dispersion-supported "puffy" systems even in the absence of environmental effects like tidal interactions. We also find indications of an upward trend between vᵣₒₜ/σ_⋆ and galaxy stellar mass, perhaps implying that stellar disk formation depends on mass rather than environment. Although some of our conclusions may be slightly modified by systematic effects, our main result still holds: that isolated low-mass galaxies may form and remain as puffy systems rather than the dynamically cold disks predicted by classical galaxy formation theory.
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