期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 499, 期 1, 页码 1406-1423出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa2913
关键词
galaxies: bar; galaxies: evolution; galaxies: formation; galaxies: star formation; galaxies: structure
资金
- National Key R&D Program of China [2018YFA0404502]
- National Science Foundation of China [11821303, 11973030, 11761131004, 11761141012, 11603075, U1831205, 11703063]
- Alfred P. Sloan Foundation
- US Department of Energy Office of Science
- Centre for High-Performance Computing at the University of Utah
- Brazilian Participation Group
- Carnegie Institution for Science
- Carnegie Mellon University
- Chilean Participation Group
- French Participation Group
- Harvard-Smithsonian Center for Astrophysics
- Instituto de Astrofsica de Canarias
- Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
- Lawrence Berkeley National Laboratory
- Leibniz Institut fur Astrophysik Potsdam (AIP)
- MaxPlanck-Institut fur Astronomie (MPIA Heidelberg)
- Max-PlanckInstitut fur Astrophysik (MPA Garching)
- Max-Planck-Institut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatory of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional/MCTI
- Ohio StateUniversity
- Pennsylvania State University
- ShanghaiAstronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Portsmouth
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
We analyse two-dimensional maps and radial profiles of EW(H alpha), EW(H delta(A)), and D-n(4000) of low-redshift galaxies using integral field spectroscopy from the MaNGA survey. Out of approximate to 1400 nearly face-on late-type galaxies with a redshift z < 0.05, we identify 121 turnover galaxies that each have a central upturn in EW(H alpha), EW(H delta(A)), and/or a central drop in D-n(4000), indicative of ongoing/recent star formation. The turnover features are found mostly in galaxies with a stellar mass above similar to 10(10) M-circle dot and NUV - r colour less than approximate to 5. The majority of the turnover galaxies are barred, with a bar fraction of 89 +/- 3 per cent. Furthermore, for barred galaxies, the radius of the central turnover region is found to tightly correlate with one-third of the bar length. Comparing the observed and the inward extrapolated star formation rate surface density, we estimate that the central SFR have been enhanced by an order of magnitude. Conversely, only half of the barred galaxies in our sample have a central turnover feature, implying that the presence of a bar is not sufficient to lead to a central SF enhancement. We further examined the SF enhancement in paired galaxies, as well as the local environment, finding no relation. This implies that the environment is not a driving factor for central SF enhancement in our sample. Our results reinforce both previous findings and theoretical expectation that galactic bars play a crucial role in the secular evolution of galaxies by driving gas inflow and enhancing the star formation and bulge growth in the centre.
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