Core Density Profile Survival in Dissipationless Mergers

Details Core Density Profile Survival in Dissipationless Mergers Core Density Profile Survival in Dissipationless Mergers

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.276..851f&link_type=abstract

Astrophysics and Space Science, v. 276, Issue 2/4, p. 851-859 (2001).

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

We use N-body experiments to study the survival of power-law density cusps in mergers of spherical galaxy models. Steep cusps (e.g. ρ~ r^-2) are preserved during mergers of equal-mass models; this may be viewed as a general consequence of the incomplete violent relaxation observed in such mergers. Progenitor profile has a strong effect on remnant shape; steep cusps produce oblate remnants. If bright ellipticals form by hierarchical mergers of faint ones, the lack of steep cusps in these galaxies is somewhat surprising.

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