de Lorenzo-Cáceres, Adriana and Sánchez-Blázquez, Patricia and Méndez-Abreu, Jairo and Gadotti, Dimitri A. and Falcón-Barroso, Jesús and Martínez-Valpuesta, Inma and Coelho, Paula and Fragkoudi, Francesca and Husemann, Bernd and Leaman, Ryan and Pérez, Isabel and Querejeta, Miguel and Seidel, Marja and van de Ven, Glenn (2019) Clocking the assembly of double-barred galaxies with the MUSE TIMER project. Monthly Notices of the Royal Astronomical Society, 484 (4). pp. 5296-5314. ISSN 0035-8711. doi:10.1093/mnras/stz221. https://resolver.caltech.edu/CaltechAUTHORS:20190415-132030288
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Abstract
The formation of two stellar bars within a galaxy has proved challenging for numerical studies. It is not yet clear whether the inner bar is born via a star formation process promoted by gas inflow along the outer bar or whether it is dynamically assembled from instabilities in a small-scale stellar disc. Observational constraints to these scenarios are scarce. We present a thorough study of the stellar content of two double-barred galaxies observed by the MUSE TIMER project, NGC 1291 and NGC 5850, combined with a two-dimensional multicomponent photometric decomposition performed on the 3.6 μμm images from S^4G. Our analysis confirms the presence of σ-hollows appearing in the stellar velocity dispersion distribution at the ends of the inner bars. Both galaxies host inner discs matching in size with the inner bars, suggestive of a dynamical formation for the inner bars from small-scale discs. The analysis of the star formation histories for the structural components shaping the galaxies provides constraints on the epoch of dynamical assembly of the inner bars, which took place >6.5 Gyr ago for NGC 1291 and >4.5 Gyr ago for NGC 5850. This implies that inner bars are long-lived structures.
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| Additional Information: | © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2019 January 17. Received 2019 January 15; in original form 2018 September 7. Published: 22 January 2019. We are grateful to Peter Erwin for providing his HST data for NGC 4984 for inspection, as well as to the anonymous referee for many valuable comments which helped improving this manuscript. AdLC and JMA thank the European Southern Observatory for the warm hospitality during a science visit when part of this work was done. This work is based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 097.B-0640(A). AdLC acknowledges support from grant AYA2016-77237-C3-1-P from the Spanish Ministry of Economy and Competitiveness (MINECO). PSB acknowledges support from grant AYA2016-77237-C3-2-P from the Spanish Ministry of Economy and Competitiveness (MINECO). JMA acknowledges support from the Spanish Ministry of Economy and Competitiveness (MINECO) by grants AYA2013-43188-P and AYA2017-83204-P. GvdV acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 724857 (Consolidator Grant ArcheoDyn). | ||||||||||||||
| Group: | Infrared Processing and Analysis Center (IPAC) | ||||||||||||||
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| Subject Keywords: | galaxies: evolution – galaxies: individual: NGC1291 – galaxies: individual: NGC5850 – galaxies: kinematics and dynamics – galaxies: stellar content – galaxies: structure | ||||||||||||||
| Issue or Number: | 4 | ||||||||||||||
| DOI: | 10.1093/mnras/stz221 | ||||||||||||||
| Record Number: | CaltechAUTHORS:20190415-132030288 | ||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190415-132030288 | ||||||||||||||
| Official Citation: | Adriana de Lorenzo-Cáceres, Patricia Sánchez-Blázquez, Jairo Méndez-Abreu, Dimitri A Gadotti, Jesús Falcón-Barroso, Inma Martínez-Valpuesta, Paula Coelho, Francesca Fragkoudi, Bernd Husemann, Ryan Leaman, Isabel Pérez, Miguel Querejeta, Marja Seidel, Glenn van de Ven, Clocking the assembly of double-barred galaxies with the MUSE TIMER project, Monthly Notices of the Royal Astronomical Society, Volume 484, Issue 4, April 2019, Pages 5296–5314, https://doi.org/10.1093/mnras/stz221 | ||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||
| ID Code: | 94708 | ||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||||
| Deposited On: | 16 Apr 2019 21:37 | ||||||||||||||
| Last Modified: | 16 Nov 2021 17:07 |
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