Stellar feedback impact on the ionized gas kinematics in the dwarf galaxy Sextans B

• DOI: 10.48550/arxiv.2402.03027
• Publication Date: 2024-02-05
• Authors: Ivan S. Gerasimov; Oleg V. Egorov; А. В. Моисеев; A. Y. Kniazev; Tatiana A. Lozins...; E. S. Egorova

We investigated the ionised and atomic gas kinematics excitation state in central region of ongoing star formation nearby low-metallicity dwarf galaxy Sextans B. The analysis is based on new observations performed Ha emission line with high resolution ($R \sim 16000$) scanning Fabry-Perot interferometer at 6-m BTA SAO RAS telescope, long-slit spectral 9.2-m SALT 2.5-m CMO SAI MSU telescopes. Strong non-circular motions detected studied regions probably resulted from off-plane impact stellar feedback. identified six elevated velocity dispersion, five which exhibit asymmetric or two-component profiles. Three these are young ($<1.1$ Myr) expanding ($V_{\rm exp} 25-50\ {\rm km\ s^{-1}}$) superbubbles. argue that least three could be supernova remnants. conclude supernovae feedback dominant source energy for superbubbles B, expected such a low metallicity, although we cannot rule out strong pre-supernova one superbubble.