The Close AGN Reference Survey (CARS): Comparative analysis of the structural properties of star-forming and non-star-forming galaxy bars
| Autor: | Scott M. Croom, Mirko Krumpe, Bernd Husemann, I. Smirnova-Pinchukova, Timothy A. Davis, J. Scharwächter, Justus Neumann, Dimitri A. Gadotti, Grant R. Tremblay, Lutz Wisotzki, Miguel A. Pérez-Torres, Tanya Urrutia, Francoise Combes, Gerold Busch, Massimo Gaspari |
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| Přispěvatelé: | Science and Technology Facilities Council (UK), Princeton University, National Aeronautics and Space Administration (US), German Research Foundation |
| Rok vydání: | 2019 |
| Předmět: |
active [Galaxies]
Bar (music) structure [Galaxies] Population FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Star (graph theory) Galaxies: formation 01 natural sciences star formation [Galaxies] Luminosity Galaxies: structure 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics education Spectroscopy 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics education.field_of_study Galaxies: star formation 010308 nuclear & particles physics Star formation Spatially resolved photometry [Galaxies] Galaxies: evolution Astronomy and Astrophysics Galaxies: photometry Galaxies: active evolution [Galaxies] Astrophysics - Astrophysics of Galaxies formation [Galaxies] Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Astronomy and Astrophysics Neumann, J, Gadotti, D A, Wisotzki, L, Husemann, B, Busch, G, Combes, F, Croom, S M, Davis, T A, Gaspari, M, Krumpe, M, Pérez-Torres, M A, Scharwächter, J, Smirnova-Pinchukova, I, Tremblay, G R & Urrutia, T 2019, ' The Close AGN Reference Survey (CARS) : comparative analysis of the structural properties of star-forming and non-star-forming galaxy bars ', Astronomy and Astrophysics, vol. 627, A26 . https://doi.org/10.1051/0004-6361/201834441 |
| ISSN: | 0004-6361 |
| DOI: | 10.48550/arxiv.1905.05214 |
| Popis: | The absence of star formation in the bar region that has been reported for some galaxies can theoretically be explained by shear. However, it is not clear how star-forming (SF) bars fit into this picture and how the dynamical state of the bar is related to other properties of the host galaxy. We used integral-field spectroscopy from VLT/MUSE to investigate how star formation within bars is connected to structural properties of the bar and the host galaxy. We derived spatially resolved H$��$ fluxes from MUSE observations from the CARS survey to estimate star formation rates in the bars of 16 nearby ($0.01 < z < 0.06$) disc galaxies with stellar masses between $10^{10} M_\odot$ and $10^{11} M_\odot$. We further performed a detailed multicomponent photometric decomposition on images derived from the data cubes. We find that bars clearly divide into SF and non-star-forming (non-SF) types, of which eight are SF and eight are non-SF. Whatever the responsible quenching mechanism is, it is a quick process compared to the lifetime of the bar. The star formation of the bar appears to be linked to the flatness of the surface brightness profile in the sense that only the flattest bars $\left(n_\mathrm{bar} \leq 0.4\right)$ are actively SF $\left(\mathrm{SFR_{b}} > 0.5 M_\odot \mathrm{yr^{-1}}\right)$. Both parameters are uncorrelated with Hubble type. We find that star formation is 1.75 times stronger on the leading than on the trailing edge and is radially decreasing. The conditions to host non-SF bars might be connected to the presence of inner rings. Additionally, from testing an AGN feeding scenario, we report that the star formation rate of the bar is uncorrelated with AGN bolometric luminosity. The results of this study may only apply to type-1 AGN hosts and need to be confirmed for the full population of barred galaxies. 28 pages, 18 figues, 3 tables, accepted for publication in A&A |
| Databáze: | OpenAIRE |
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