Rotation curve bifurcations as indicators of close recent galaxy encounters

S. Pedrosa, P. B. Tissera, I. Fuentes-Carrera, C. Mendes De Oliveira

Resultado de la investigación: Article

9 Citas (Scopus)

Resumen

Context: Rotation curves of interacting galaxies often show that velocities are either rising or falling in the direction of the companion galaxy. Aims: We seek to reproduce and analyse these features in the rotation curves of simulated equal-mass galaxies suffering a one-to-one encounter as possible indicators of close encounters. Methods: Using simulations of major mergers in 3D, we study the time evolution of these asymmetries in a pair of galaxies during the first passage. Results: Our main results are: (a) the rotation curve asymmetries appear right at pericentre of the first passage, (b) the significant disturbed rotation velocities occur within a small time interval, of , and, therefore, the presence of bifurcation in the velocity curve could be used as an indicator of the pericentre occurrence. These results are in qualitative agreement with previous findings for minor mergers and flybys.

Idioma originalEnglish
Páginas (desde-hasta)299-302
Número de páginas4
PublicaciónAstronomy and Astrophysics
Volumen484
N.º2
DOI
EstadoPublished - jun 2008

Huella dactilar

bifurcation
encounters
galaxies
curves
merger
asymmetry
interacting galaxies
falling
occurrences
intervals
indicator
simulation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Pedrosa, S. ; Tissera, P. B. ; Fuentes-Carrera, I. ; De Oliveira, C. Mendes. / Rotation curve bifurcations as indicators of close recent galaxy encounters. En: Astronomy and Astrophysics. 2008 ; Vol. 484, N.º 2. pp. 299-302.
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abstract = "Context: Rotation curves of interacting galaxies often show that velocities are either rising or falling in the direction of the companion galaxy. Aims: We seek to reproduce and analyse these features in the rotation curves of simulated equal-mass galaxies suffering a one-to-one encounter as possible indicators of close encounters. Methods: Using simulations of major mergers in 3D, we study the time evolution of these asymmetries in a pair of galaxies during the first passage. Results: Our main results are: (a) the rotation curve asymmetries appear right at pericentre of the first passage, (b) the significant disturbed rotation velocities occur within a small time interval, of , and, therefore, the presence of bifurcation in the velocity curve could be used as an indicator of the pericentre occurrence. These results are in qualitative agreement with previous findings for minor mergers and flybys.",
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Rotation curve bifurcations as indicators of close recent galaxy encounters. / Pedrosa, S.; Tissera, P. B.; Fuentes-Carrera, I.; De Oliveira, C. Mendes.

En: Astronomy and Astrophysics, Vol. 484, N.º 2, 06.2008, p. 299-302.

Resultado de la investigación: Article

TY - JOUR

T1 - Rotation curve bifurcations as indicators of close recent galaxy encounters

AU - Pedrosa, S.

AU - Tissera, P. B.

AU - Fuentes-Carrera, I.

AU - De Oliveira, C. Mendes

PY - 2008/6

Y1 - 2008/6

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AB - Context: Rotation curves of interacting galaxies often show that velocities are either rising or falling in the direction of the companion galaxy. Aims: We seek to reproduce and analyse these features in the rotation curves of simulated equal-mass galaxies suffering a one-to-one encounter as possible indicators of close encounters. Methods: Using simulations of major mergers in 3D, we study the time evolution of these asymmetries in a pair of galaxies during the first passage. Results: Our main results are: (a) the rotation curve asymmetries appear right at pericentre of the first passage, (b) the significant disturbed rotation velocities occur within a small time interval, of , and, therefore, the presence of bifurcation in the velocity curve could be used as an indicator of the pericentre occurrence. These results are in qualitative agreement with previous findings for minor mergers and flybys.

KW - Galaxies: interactions

KW - Galaxies: spiral

KW - Galaxy: kinematics and dynamics

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