| Título: | Evolution induced by dry minor mergers onto fast-rotator S0 galaxies |
| Autores: | Tapia, Trinidad ; Eliche Moral, María del Carmen ; Querejeta, Miguel ; Balcells, Marc ; González García, A. César ; Prieto, Mercedes ; Aguerri, J. Alfonso L. ; Gallego Maestro, Jesús ; Zamorano Calvo, Jaime ; Rodríguez Pérez, Cristina ; Borlaff, Alejandro |
| Tipo de documento: | texto impreso |
| Editorial: | EDP Sciencies, 2014-05 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Física: Astrofísica , Materia = Ciencias: Física: Astronomía , Tipo = Artículo |
| Resumen: |
Context. Numerical studies have shown that the properties of the S0 galaxies with kinematics intermediate between fast and slow rotators are difficult to explain by a scenario of major mergers. Aims. We investigate whether the smoother perturbation induced by minor mergers can reproduce these systems. Methods. We analysed collisionless N-body simulations of intermediate and minor dry mergers onto S0s to determine the structural and kinematic evolution induced by the encounters. The original primary galaxies represent gas-poor fast-rotator S0b and S0c galaxies with high intrinsic ellipticities. The original bulges are intrinsically spherical and have low rotation. Different mass ratios, parent bulges, density ratios, and orbits were studied. Results. Minor mergers induce a lower decrease of the global rotational support (as provided by ?_e) than encounters of lower mass ratios, which results in S0s with properties intermediate between fast and slow rotators. The resulting remnants are intrinsically more triaxial, less flattened, and span the whole range of apparent ellipticities up to ?_e ~ 0.8. They do not show lower apparent ellipticities in random projections than initially; on the contrary, the formation of oval distortions and the disc thickening increase the percentage of projections at 0.4 0.9), but exhibit a wide range of triaxialities (0.20 Conclusions. The smoother changes induced by minor mergers can explain the existence of S0s with intermediate kinematic properties between fast and slow rotators that are difficult to explain with major mergers. The different trends exhibited by ellipticals and S0 galaxies in the ? – ?_e diagram may be pointing to the different role played by major mergers in the build-up of each morphological type. |
| En línea: | https://eprints.ucm.es/34385/1/jesusgallego123preprint.pdf |
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