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MaNGA galaxies with off-centered spots of enhanced gas velocity dispersion by Pilyugin, L. S.; Cedres, B.; Zinchenko, I. A.; Garcia, A. M. Perez; Lara-Lopez, M. A.; Nadolny, J.; Nefedyev, Y. A.; Gonzalez-Otero, M.; Vilchez, J. M.; Puertas, S. Duarte; Martinez, R. Navarro is a scholarly article available to read on EtoBox.

What is MaNGA galaxies with off-centered spots of enhanced gas velocity dispersion about?

Off-centered spots of the enhanced gas velocity dispersion, s, are revealed in some galaxies from the MaNGA survey. Aiming to clarify the origin of the spots of enhanced s, we examine the distributions of the surface brightness, the line-of-sight velocity, the oxygen abundance, the gas velocity dispersion, and the BPT spaxel classification in seven galaxies. We find that the enhanced s spots in six galaxies can be attributed to a (minor) interaction with a satellite. Three galaxies in our sample have a very close satellite. The spots of enhanced s in those galaxies are located at the edge of the galaxy close to the satellite. The spots of enhanced s in three other galaxies are related to bright spots in the photometric B band within the galaxy, which can be due to the projection of a satellite in the line of sight of the galaxy. The oxygen abundances in the spots in these three galaxies are reduced. This suggests that the low-metallicity gas from the satellite is mixed with the interstellar medium of the disk. The spectra of the spaxels within a spot are usually HII-region-like, suggesting that the interaction in those galaxies does not result in appreciable shocks. In contrast, th

Author

Pilyugin, L. S.; Cedres, B.; Zinchenko, I. A.; Garcia, A. M. Perez; Lara-Lopez, M. A.; Nadolny, J.; Nefedyev, Y. A.; Gonzalez-Otero, M.; Vilchez, J. M.; Puertas, S. Duarte; Martinez, R. Navarro

Published

2021

Language

EN