Abstract
ELLIPTICAL galaxies were once thought to be smooth, featureless stellar systems with little or no substructure, but increasingly sophisticated observations are challenging this point of view. Some ellipticals contain small central disks which may be counter-rotating or otherwise kinematically decoupled from the rest of the galaxy1–6. It seems unlikely that these disks could form during the monolithic collapse of a slowly rotating proto-galaxy, as the most plausible outcome of such evolution is a system with a simple rotation pattern. Like other kinds of fine structure in elliptical galaxies7, these subsystems have been widely interpreted as evidence for multiple formation events or episodes. Here we demonstrate the formation of a counter-rotating central gas disk in a merger of two gas-rich disk galaxies of equal mass. Such a structure may well account for the unusual gas kinematics found in the merger remnant NGC7252 (refs 8, 9). Continued star formation in such gaseous disks may produce central components with decoupled kinematics, resembling the cores of some elliptical galaxies.
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References
Efstathiou, G., Ellis, R. S. & Carter, D. Mon. Not. R. astr. Soc. 201, 975–990 (1982).
Bender, R. in Dynamics and Interactions of Galaxies (ed. Wielen, R.) 232–243 (Springer, Berlin, 1990).
Franx, M. & Illingworth, G. D. Astrophys. J. 327, L55–60 (1988).
Franx, M., Illingworth, G. D. & Heckman, T. M. Astrophys. J. 344, 613–636 (1989).
Jedrzejewski, R. I. & Schechter, P. L. Astr. J. 98, 147–165 (1988).
Wagner, S. J., Bender, R. & Möllenhof, C. Astr. Astrophys. 195, L5–8 (1988).
Seitzer, P. & Schweizer, F. in Dynamics and Interactions of Galaxies (ed. Wielen, R.) 270–271 (Springer, Berlin, 1990).
Schweizer, F. Astrophys. J. 252, 455–460 (1982).
Schweizer, F. in Dynamics and Interactions of Galaxies (ed. Wielen, R.) 60–71 (Springer, Berlin, 1990).
de Vaucouleurs, G. Ann. Astrophys. 11, 247–287 (1948).
Hernquist, L. & Quinn, P. J. Astrophys. J. 331, 682–698 (1988).
Hernquist, L. & Quinn, P. J. Astrophys. J. 342, 1–16 (1989).
Bertola, F. & Capaccioli, M. Astrophys. J. 200, 439–445 (1975).
Illingworth, G. D. Astrophys. J. 218, L43–47 (1977).
Binney, J. J. Mon. Not. R. astr. Soc. 183, 501–514 (1978).
Illingworth, G. D. & Franx, M. in Dynamics of Dense Stellar Systems (ed. Merritt, D.) 13–23 (Cambridge University Press, 1989).
Jedrzejewski, R. I. & Schechter, P. L. in Dynamics of Dense Stellar Systems (ed. Merritt, D.) 25–30 (Cambridge University Press, 1989).
Statler, T. Astr. J. 102, 882–892 (1991).
Bender, R. Astr. Astrophys. 229, 441–451 (1990).
Rix, H.-W. & White, S. D. M. Mon. Not. R. astr. Soc. (in the press).
Kormendy, J. Astrophys. J. 287, 577–585 (1984).
Balcells, M. & Quinn, P. J. Astrophys. J. 361, 381–393 (1990).
Hernquist, L. & Katz, N. Astrophys. J. Suppl. 70, 419–446 (1989).
Barnes, J. E. & Hut, P. Nature 324, 446–449 (1986).
Hernquist, L. Astrophys. J. Suppl. 64, 715–734 (1977).
Gingold, R. A. & Monaghan, J. J. Mon. Not. R. astr. Soc. 181, 375–389 (1977).
Lucy, L. Astr. J. 82, 1013–1024 (1977).
Barnes, J. E. & Hernquist, L. Astrophys. J. 370, L65–68 (1991).
Barnes, J. E. Astrophys. J. 331, 699–717 (1988).
Hernquist, L. Nature 340, 687–691 (1989).
Malin, D. F. in New Aspects of Galaxy Photometry (ed. Nieto, J.-L.) 27–37 (Springer, Berlin, 1985).
Heckman, T. M. et al. Astrophys. J. 311, 526–547 (1986).
Vader, J. P., Heisler, C. A. & Frogel, J. A. Ann. N. Y. Acad. Sci. 571, 247–248 (1989).
Toomre, A. in The Evolution of Galaxies and Stellar Populations (eds Tinsley, B. M. & Larson, R. B.) 401–426 (Yale University Observatory, New Haven, 1977).
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Hernquist, L., Barnes, J. Origin of kinematic subsystems in elliptical galaxies. Nature 354, 210–212 (1991). https://doi.org/10.1038/354210a0
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DOI: https://doi.org/10.1038/354210a0
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