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  Inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey

Bittner, A., Sánchez-Blázquez, P., Gadotti, D. A., Neumann, J., Fragkoudi, F., Coelho, P., et al. (2020). Inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey. Astronomy and Astrophysics, 643: A65. doi:10.1051/0004-6361/202038450.

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 Creators:
Bittner, Adrian, Author
Sánchez-Blázquez, Patricia, Author
Gadotti, Dimitri A., Author
Neumann, Justus, Author
Fragkoudi, Francesca1, Author              
Coelho, Paula, Author
de Lorenzo-Cáceres, Adriana, Author
Falcón-Barroso, Jesús, Author
Kim, Taehyun, Author
Leaman, Ryan, Author
Martín-Navarro, Ignacio, Author
Méndez-Abreu, Jairo, Author
Pérez, Isabel, Author
Querejeta, Miguel, Author
Seidel, Marja K., Author
van de Ven, Glenn, Author
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1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: The centres of disc galaxies host a variety of structures built via both internal and external processes. In this study, we constrain the formation and evolution of these central structures, in particular, nuclear rings and nuclear discs, by deriving maps of mean stellar ages, metallicities, and [α/Fe] abundances. We use observations obtained with the MUSE integral-field spectrograph for the TIMER sample of 21 massive barred galaxies. Our results indicate that nuclear discs and nuclear rings are part of the same physical component, with nuclear rings constituting the outer edge of nuclear discs. All nuclear discs in the sample are clearly distinguished based on their stellar population properties. As expected in the picture of bar-driven secular evolution, nuclear discs are younger, more metal-rich, and exhibit lower [α/Fe] enhancements, as compared to their immediate surroundings. Moreover, nuclear discs exhibit well-defined radial gradients, with ages and metallicities decreasing, and [α/Fe] abundances increasing with radius out to the nuclear ring. Often, these gradients show no breaks from the edge of the nuclear disc up through the centre, suggesting that these structures extend to the very centres of galaxies. We argue that continuous (stellar) nuclear discs may form from a series of bar-built (initially gas-rich) nuclear rings that expand in their radius as the bar evolves. In this picture, nuclear rings are simply the (often) star-forming outer edge of nuclear discs. Finally, by combining our results with those taken from a accompanying kinematic study, we do not find evidence for the presence of large, dispersion-dominated components in the centres of these galaxies. This could be a result of quiet merger histories, despite the large galaxy masses, or, perhaps, due to high angular momentum and strong feedback processes preventing the formation of these kinematically hot components.

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Language(s): eng - English
 Dates: 2020-11-03
 Publication Status: Published online
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 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202038450
Other: LOCALID: 3280858
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 643 Sequence Number: A65 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1