Can Elliptical Galaxies BE Formed by Merging of Spirals

Details Can Elliptical Galaxies BE Formed by Merging of Spirals Can Elliptical Galaxies BE Formed by Merging of Spirals

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..637v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 245, NO.4/AUG15, P. 637, 1990

Astronomy and Astrophysics

Astronomy

7

Scientific paper

It is shown, on the basis of the mixing theorem, that normal elliptical galaxies cannot form through dissipationless merging of pure stellar discs, but that the inclusion of a modest bulge component in the disc galaxy models overcomes the problem with respect to phase space density constraints. The bulge-to-disc ratios required are found to be in the range 0.1-0.5; the smaller the systems, the higher the bulge-to-disc ratio needed. We stress that not only phase space density, but also space density constraints, are of relevance in the dissipationless merging scenario.

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