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Stellar populations across galaxy bars in the MUSE TIMER project

Neumann, Justus and Fragkoudi, Francesca and Pérez, Isabel and Gadotti, Dimitri A. and Falcón-Barroso, Jesús and Sánchez-Blázquez, Patricia and Bittner, Adrian and Husemann, Bernd and Gómez, Facundo A. and Grand, Robert J. J. and Donohoe-Keyes, Charlotte E. and Kim, Taehyun and de Lorenzo-Cáceres, Adriana and Martig, Marie and Méndez-Abreu, Jairo and Pakmor, Rüdiger and Seidel, Marja K. and van de Ven, Glenn (2020) Stellar populations across galaxy bars in the MUSE TIMER project. Astronomy and Astrophysics, 637 . Art. No. A56. ISSN 0004-6361. doi:10.1051/0004-6361/202037604.

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Stellar populations in barred galaxies save an imprint of the influence of the bar on the host galaxy’s evolution. We present a detailed analysis of star formation histories (SFHs) and chemical enrichment of stellar populations in nine nearby barred galaxies from the TIMER project. We used integral field observations with the MUSE instrument to derive unprecedented spatially resolved maps of stellar ages, metallicities, [Mg/Fe] abundances, and SFHs, as well as Hα as a tracer of ongoing star formation. We find a characteristic V-shaped signature in the SFH that is perpendicular to the bar major axis, which supports the scenario where intermediate-age stars (∼2 − 6 Gyr) are trapped on more elongated orbits shaping a thinner part of the bar, while older stars (> 8 Gyr) are trapped on less elongated orbits shaping a rounder and thicker part of the bar. We compare our data to state-of-the-art cosmological magneto-hydrodynamical simulations of barred galaxies and show that such V-shaped SFHs arise naturally due to the dynamical influence of the bar on stellar populations with different ages and kinematic properties. Additionally, we find an excess of very young stars (< 2 Gyr) on the edges of the bars, predominantly on the leading side, thus confirming typical star formation patterns in bars. Furthermore, mass-weighted age and metallicity gradients are slightly shallower along the bar than in the disc, which is likely due to orbital mixing in the bar. Finally, we find that bars are mostly more metal-rich and less [Mg/Fe]-enhanced than the surrounding discs. We interpret this as a signature that the bar quenches star formation in the inner region of discs, usually referred to as star formation deserts. We discuss these results and their implications on two different scenarios of bar formation and evolution.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Neumann, Justus0000-0002-3289-8914
Gadotti, Dimitri A.0000-0003-1775-2367
Falcón-Barroso, Jesús0000-0002-0608-9574
Husemann, Bernd0000-0003-2901-6842
Kim, Taehyun0000-0002-5857-5136
de Lorenzo-Cáceres, Adriana0000-0002-9744-3486
Méndez-Abreu, Jairo0000-0002-8766-2597
van de Ven, Glenn0000-0003-4546-7731
Additional Information:© 2020 ESO. Article published by EDP Sciences. Received 28 January 2020; Accepted 18 March 2020; Published online 14 May 2020. We thank Vincenzo Fiorenzo for carefully reading the manuscript and providing a constructive referee report that helped to improve the paper. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 097.B-0640(A) and 060.A-9313(A). The Science, Technology and Facilities Council is acknowledged by JN for support through the Consolidated Grant Cosmology and Astrophysics at Portsmouth, ST/S000550/1. JMA acknowledges support from the Spanish Ministerio de Economia y Competitividad (MINECO) by the grant AYA2017-83204-P. J.F-B, AdLC and PSB acknowledge support through the RAVET project by the grant AYA2016-77237-C2-1-P and AYA2016-77237-C3-1-P from the Spanish Ministry of Science, Innovation and Universities (MCIU) and through the IAC project TRACES which is partially supported through the state budget and the regional budget of the Consejería de Economía, Industria, Comercio y Conocimiento of the Canary Islands Autonomous Community. FAG acknowledges financial support from CONICYT through the project FONDECYT Regular Nr. 1181264, and funding from the Max Planck Society through a Partner Group grant.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/S000550/1
Ministerio de Economia y Competitividad (MINECO)AYA2017-83204-P
Ministerio de Economia y Competitividad (MINECO)AYA2016-77237-C2-1-P
Ministerio de Economia y Competitividad (MINECO)AYA2016-77237-C3-1-P
Consejería de Economía, Industria, Comercio y ConocimientoUNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1181264
Max Planck SocietyUNSPECIFIED
Subject Keywords:galaxies: formation – galaxies: evolution – galaxies: stellar content – galaxies: structure – galaxies: star formation – galaxies: kinematics and dynamics
Record Number:CaltechAUTHORS:20200514-133646956
Persistent URL:
Official Citation:Stellar populations across galaxy bars in the MUSE TIMER project. Justus Neumann, Francesca Fragkoudi, Isabel Pérez, Dimitri A. Gadotti, Jesús Falcón-Barroso, Patricia Sánchez-Blázquez, Adrian Bittner, Bernd Husemann, Facundo A. Gómez, Robert J. J. Grand, Charlotte E. Donohoe-Keyes, Taehyun Kim, Adriana de Lorenzo-Cáceres, Marie Martig, Jairo Méndez-Abreu, Rüdiger Pakmor, Marja K. Seidel and Glenn van de Ven. A&A, 637 (2020) A56; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103204
Deposited By: Tony Diaz
Deposited On:14 May 2020 21:02
Last Modified:16 Nov 2021 18:19

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