Bibcode
Balcells, M.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. L9-L12.
Advertised on:
9
1991
Citations
13
Refereed citations
11
Description
Absorption line profile asymmetries in ellipticals with peculiar core
kinematics, and their role as diagnostics of mergers, are analyzed using
self-consistent numerical merger models. The remnants of mergers
involving a denser secondary component show asymmetric line-of-sight
velocity distributions at their cores. Skewness is negative where the
rotation curve is positive and positive where the rotation curve is
negative, in close agreement with observations. In the models, the
asymmetry is not due to a disk of accreted secondary material; it is
intrinsic to the distribution of primary particles, and has been added
during the merger. It is argued that the asymmetries are a consequence
of the transfer of the orbital energy and angular momentum to the
primary particles during the merger; for the mergers studied here,
profile asymmetries are a relic of the formation dynamics rather than
the signature of superimposed components.