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@Article{Sánchez-MenguianoSKCPRSGAGMG:2016:AzVaGa,
               author = "S{\'a}nchez-Menguiano, L. and S{\'a}nchez, S. F. and Kawata, D. 
                         and Chemin, Laurent and P{\'e}rez, I. and Ruiz-Lara, T. and 
                         S{\'a}nchez-Bl{\'a}zquez, P. and Galbany, L. and Anderson, J. P. 
                         and Grand, R. J. J. and Minchev, I. and G{\'o}mez, F. A.",
          affiliation = "{Instituto de Astrof{\'{\i}}sica de Andaluc{\'{\i}}a (CSIC)} 
                         and {} and {Universidad Nacional Aut{\'o}noma} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidad de 
                         Granada} and {Universidad de Granada} and {Pontificia Universidad 
                         Cat{\'o}lica de Chile} and {Millennium Institute of Astrophysics} 
                         and {European Southern Observatory} and {Heidelberger Institut 
                         f{\"u}r Theoretische Studien} and {Leibniz-Institut f{\"u}r 
                         Astrophysik Potsdam (AIP)} and {Max-Planck-Institut f{\"u}r 
                         Astrophysik}",
                title = "Evidence of ongoing radial migration in NGC 6754: azimuthal 
                         variations of the gas properties",
              journal = "Astrophysical Journal Letters",
                 year = "2016",
               volume = "830",
               number = "2",
                pages = "L40",
                month = "Oct.",
             keywords = "galaxies: abundances, galaxies: evolution, galaxies: ISM, 
                         galaxies: spiral, H II regions, techniques: imaging 
                         spectroscopy.",
             abstract = "Understanding the nature of spiral structure in disk galaxies is 
                         one of the main, and still unsolved, questions in galactic 
                         astronomy. However, theoretical works are proposing new testable 
                         predictions whose detection is becoming feasible with recent 
                         development in instrumentation. In particular, streaming motions 
                         along spiral arms are expected to induce azimuthal variations in 
                         the chemical composition of a galaxy at a given galactic radius. 
                         In this Letter, we analyze the gas content in NGC 6754 with 
                         VLT/MUSE data to characterize its 2D chemical composition and 
                         H\α line of sight velocity distribution. We find that the 
                         trailing (leading) edge of the NGC 6754 spiral arms show 
                         signatures of tangentially slower, radially outward (tangentially 
                         faster, radially inward) streaming motions of metal-rich (poor) 
                         gas over a large range of radii. These results show direct 
                         evidence of gas radial migration for the first time. We compare 
                         our results with the gas behavior in an N-body disk simulation 
                         showing spiral morphological features rotating with a similar 
                         speed as the gas at every radius, in good agreement with the 
                         observed trend. This indicates that the spiral arm features in NGC 
                         6754 may be transient and rotate similarly as the gas does at a 
                         large range of radii.",
                  doi = "10.3847/2041-8205/830/2/L40",
                  url = "http://dx.doi.org/10.3847/2041-8205/830/2/L40",
                 issn = "2041-8205 and 2041-8213",
             language = "en",
           targetfile = "sanchez_evidence.pdf",
        urlaccessdate = "04 dez. 2020"
}


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