The Fornax3D project: Environmental effects on the assembly of dynamically cold disks in Fornax cluster galaxies
| Autor: | Y. Ding, L. Zhu, G. van de Ven, L. Coccato, E. M. Corsini, L. Costantin, K. Fahrion, J. Falcón-Barroso, D. A. Gadotti, E. Iodice, M. Lyubenova, I. Martín-Navarro, R. M. McDermid, F. Pinna, M. Sarzi |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
galaxies: kinematics and dynamics
galaxies: elliptical and lenticular cD galaxies: star formation galaxies: formation galaxies: structure galaxies: evolution Astrophysics - Astrophysics of Galaxies Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) FOS: Physical sciences Astronomy and Astrophysics |
| Popis: | We apply a population-orbit superposition method to 16 galaxies in the Fornax cluster observed with MUSE/VLT in the context of the Fornax3D project. By fitting the luminosity distribution, stellar kinematics, and age and metallicity maps simultaneously, we obtained the internal stellar orbit distribution, as well as the age and metallicity distribution of stars on different orbits for each galaxy. Based on the model, we decompose each galaxy into a dynamically cold disk (orbital circularity $\lambda_z\ge0.8$) and a dynamically hot non-disk component (orbital circularity $\lambda_z8$ Gyr are a factor of $\sim 4$ lower than in more recent infallers while controlling for total stellar mass. Nine of the 16 galaxies have spatially extended cold disks, and most of them show positive or zero age gradients; stars in the inner disk are $\sim 2-5$ Gyr younger than that in the outer disk, in contrast to the expectation of inside-out growth. Our results indicate that the assembly of cold disks in galaxies is strongly affected by their infall into clusters, by either removal of gas in outer regions or even tidally stripping or heating part of the pre-existing disks. Star formation in outer disks can stop quickly after the galaxy falls into the cluster, while star formation in the inner disks can last for a few Gyrs more, building the positive age gradient measured in cold disks. Comment: 31 pages, 32 figures, Accepted to A&A |
| Databáze: | OpenAIRE |
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