The dichotomy of early-type galaxies from their globular cluster systems

Details The dichotomy of early-type galaxies from their globular cluster systems The dichotomy of early-type galaxies from their globular cluster systems

1996-10-03

arxiv.org/abs/astro-ph/9610019v1

Astronomy and Astrophysics

Astrophysics

9 pages (incl. 7 .ps figures), A&A style, accepted in A&A, also available at http://aibn55.astro.uni-bonn.de:8000/~mkissler/

Scientific paper

Growing evidence for the existence of two classes of ellipticals calls for a comparison of the properties of their globular cluster systems. I compiled information on the properties of over 50 globular cluster systems of faint and bright early-type galaxies, and investigated them in the light of the properties of the parent galaxies. The properties of globular cluster systems appear to separate into two classes rather than to follow continuous relations with their host galaxy properties. Globular cluster systems in faint, disky early-type galaxies with unresolved cores appear essentially unperturbed and show no clear signs of a merger past, while systems in bright, boxy ellipticals with resolved cores show all signs expected after a merger event. The globular cluster systems are therefore compatible with the idea that major merger events could be a cause for the dichotomy of early-type galaxies.

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