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Revista mexicana de astronomía y astrofísica
Print version ISSN 0185-1101
Rev. mex. astron. astrofis vol.41 n.1 Ciudad de México Apr. 2005
Two scenarios for the formation of cuspy density profiles in elliptical galaxies
F. Cruz and H. Velázquez
Instituto de Astronomía, UNAM, Apdo. Postal 877, 22800 Ensenada, B. C., México (fidel@astrosen.unam.mx; hmv@astrosen.unam.mx).
Received, 2004 August 18
Accepted 2004 October 18.
RESUMEN
Hemos abordado la formación de perfiles agudos a través de simulaciones de N-cuerpos, en dos escenarios complementarios: (1) un colapso gravitacional frío alrededor de un agujero negro supermasivo preexistente, y (2) un crecimiento adiabático de un agujero negro en un sistema estelar relajado obtenido de un colapso gravitacional frío. Ambos modelos dan lugar a un perfil de densidad, ργ, con un índice de ley de potencias similar, γ; sin embargo, presentan diferencias cinemáticas y morfológicas.
ABSTRACT
We address the formation of cuspy density profiles, through N-body simulations, in two complementary scenarios: (1) a cold gravitational collapse around a preexisting supermassive black hole, and (2) an adiabatic growth of a central black hole in a relaxed stellar system obtained from a cold gravitational collapse. Both models lead to a density profile, ργ, with a similar power-law index, γ; however, they show kinematical and morphological differences.
Key Words: Galaxies: Elliptical and lenticular, CD Galaxies: Formation Galaxies: Nuclei Methods: Numerical.
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ACKNOWLEDGMENTS
This research was supported by grants DGAPA grant IN113403, UNAM, México.
REFERENCES
Aguilar, L., & Merritt, D. 1990, ApJ, 354, 33 [ Links ]
Crane, P., et al. 1993, AJ, 106, 1371 [ Links ]
Cruz, F., & Velazquez, H. 2004, ApJ, 612, 593 [ Links ]
Dorband, N., Hemsendorf, M., & Merritt, D. 2003, J. Comp. Phys., 185, 484 [ Links ]
Ferrarese, L, van den Bosch, F. C., Ford, H. C., Jaffe, W., & O'Connell, R. W. 1994, AJ, 108, 1598 [ Links ]
Franx, M., Illingworth, G., & Zeeuw, T. 1991, ApJ, 383, 112 [ Links ]
Gebhardt, K., et al. 1996, AJ, 112, 105 [ Links ]
Holley-Bockelmann, K., Mihos, J. C., Sigurdsson, S., Hernquist, L., & Norman, C. 2002, ApJ, 567, 817 [ Links ]
Kormendy, J., & Richstone, D. 1995, ARA&A, 33, 581 [ Links ]
Merritt, D., & Quinlan, Q. 1998, ApJ, 498, 625 [ Links ]
Merritt, D., & Tremblay, B. 1994, AJ, 108, 514 [ Links ]
Peebles, P. J. E. 1972, General Relativ. Gravitation, 3, 63 [ Links ]
Stiavelli, M. 1998, ApJ, 495, L91 [ Links ]
Velázquez, H,. & Aguilar, L. 2003, RevMexAA, 39, 197 [ Links ]
van der Marel, R. P. 1999, AJ, 117, 744 [ Links ]
Young, P. 1980, ApJ, 242, 1232 [ Links ]