Origin of the spectacular tidal shells of galaxy NGC 474

0568301 - FZÚ 2023 RIV FR eng J - Článek v odborném periodiku
Bilek, M. - Fensch, J. - Ebrová, Ivana - Nagesh, S.T. - Famaey, B. - Duc, P.A. - Kroupa, P.
Origin of the spectacular tidal shells of galaxy NGC 474.
Astronomy & Astrophysics. Roč. 660, April (2022), č. článku A28. ISSN 0004-6361. E-ISSN 1432-0746
Institucionální podpora: RVO:68378271
Klíčová slova: individual: NGC 474 * galaxies: formation * galaxies: interactions
Obor OECD: Particles and field physics
Impakt faktor: 6.5, rok: 2022
Způsob publikování: Open access

The lenticular galaxy NGC 474 hosts a rich system of tidal shells and streams, some of which are exceptionally bright. Two teams recently presented spectroscopic observations of the brightest shells. These were the first shell spectra ever observed in integrated starlight. The authors studied the stellar populations of the shell, of the center of the galaxy, and of its globular clusters. The precise formation scenario for the tidal features of this prominent galaxy still remained unclear, however. Aims. Here, we add further clues on their formation from the radii of the shells, and we present a scenario for the formation of the tidal features that seems to be unique and can explain all available data.
Trvalý link: https://hdl.handle.net/11104/0339630