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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1306.2407 (astro-ph)
[Submitted on 11 Jun 2013]

Title:Evolution of the gas kinematics of galaxies in cosmological simulations

Authors:Maria E. De Rossi (1,2,3), Susana E. Pedrosa (1,2) ((1) Consejo Nacional de Investigaciones Cientificas y Tecnicas, CONICET, Argentina, (2) Instituto de Astronomia y Fisica del Espacio, IAFE, Argentina, (3) Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina)
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Abstract:We studied the evolution of the gas kinematics of galaxies by performing hydrodynamical simulations in a cosmological scenario. We paid special attention to the origin of the scatter of the Tully-Fisher relation and the features which could be associated with mergers and interactions. We extended the study by De Rossi et al. (2010) and analysed their whole simulated sample which includes both, gas disc-dominated and spheroid-dominated systems. We found that mergers and interactions can affect the rotation curves directly or indirectly inducing a scatter in the Tully-Fisher Relation larger than the simulated evolution since z=3. In agreement with previous works, kinematical indicators which combine the rotation velocity and dispersion velocity in their definitions lead to a tighter relation. In addition, when we estimated the rotation velocity at the maximum of the rotation curve, we obtained the best proxy for the potential well regardless of morphology.
Comments: Accepted for publication in BAAA, Vol. 55, 2012. 4 pages, 1 figure, this http URL
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:1306.2407 [astro-ph.CO]
  (or arXiv:1306.2407v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1306.2407

Submission history

From: Maria Emilia De Rossi [view email]
[v1] Tue, 11 Jun 2013 02:24:57 UTC (26 KB)
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