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MUSE study of two giant low-surface-brightness galaxies with compact atellites

Giant low-surface-brightness galaxies (gLSBGs) are rare objects with disk radii up to 160 kpc and dynamical masses of up to the order of 1012 M⊙. Their very existence challenges currently accepted theories of galaxy formation and evolution, as it is difficult to build such large, dynamically cold di...

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Autori principali: Saburova, Anna S. (Autore) , Gasymov, Damir (Autore) , Gerasimov, Ivan S. (Autore) , Egorov, Oleg (Autore) , Chilingarian, Igor V. (Autore) , Kolganov, Fedor M. (Autore) , Zasov, Anatoly V. (Autore) , Rubtsov, Evgenii V. (Autore) , Afanasiev, Anton V. (Autore) , Demianenko, Mariia (Autore)
Natura: Article (Journal)
Lingua:inglese
Pubblicazione: 2026
In: The astrophysical journal
Year: 2026, Volume: 998, Pages: 1-13
ISSN:1538-4357
DOI:10.3847/1538-4357/ae3139
Accesso online:Verlag, kostenfrei, Volltext: https://doi.org/10.3847/1538-4357/ae3139
Testo
Note sull'autore:Anna S. Saburova, Damir Gasymov, Ivan S. Gerasimov, Oleg V. Egorov, Igor V. Chilingarian, Fedor M. Kolganov, Anatoly V. Zasov, Evgenii V. Rubtsov, Anton V. Afanasiev, Mariia V. Demianenko
Descrizione
Riassunto:Giant low-surface-brightness galaxies (gLSBGs) are rare objects with disk radii up to 160 kpc and dynamical masses of up to the order of 1012 M⊙. Their very existence challenges currently accepted theories of galaxy formation and evolution, as it is difficult to build such large, dynamically cold disks through mergers without destroying them. We present deep MUSE mosaic observations of two nearby gLSBGs with compact elliptical satellites: UGC 1382, which hosts a globally counterrotating gaseous disk, and AGC 192040, which does not. We analyze properties of ionized gas and present spatially resolved maps of kinematics and metallicity, as well as stellar population analysis for the central regions of the galaxies. The radial gradients of gas-phase metallicities are flat for both galaxies. Our observational data indicate that both galaxies experienced mergers several Gyr ago. However, the scenarios of the formation of giant disks appear to be slightly different for these two systems. For AGC 192040, we propose gas accretion from the filament or from the cooling hot halo gas followed by a merger with a companion on a prograde orbit at an intermediate mass ratio. For UGC 1382, multiple gas-rich mergers with companions on retrograde orbits are preferred by the data.
Descrizione del documento:Online veröffentlicht: 2. Februar 2026
Gesehen am 27.05.2026
Descrizione fisica:Online Resource
ISSN:1538-4357
DOI:10.3847/1538-4357/ae3139

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