@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 = "27 abr. 2024"
}