Dense stellar cores in merger remnants

Details Dense stellar cores in merger remnants Dense stellar cores in merger remnants

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437l..47m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 437, no. 1, p. L47-L50

Astronomy and Astrophysics

Astrophysics

129

Astronomical Models, Disk Galaxies, Galactic Evolution, Interacting Galaxies, Star Formation, Stellar Cores, Elliptical Galaxies, Gas Dynamics, Many Body Problem, Spatial Distribution, Spectral Signatures

Scientific paper

We use numerical models which include star formation to analyze the mass profiles of remnants formed by mergers of disk galaxies. During a merger, dissipation in gas and ensuing star formation leave behind a dense stellar core in the remnant. Rather than joining smoothly onto a de Vaucouleurs profile, the starburst population leads to a sharp break in the surface density profile at a few percent of the effective radius. While our results are preliminary, the lack of such signatures in most elliptical galaxies suggests that mergers of gas-rich disk galaxies may not have contributed greatly to the populations of present-day ellipticals.

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