The low-mass extension of the fundamental plane of elliptical galaxies

Details The low-mass extension of the fundamental plane of elliptical galaxies The low-mass extension of the fundamental plane of elliptical galaxies

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230l..17n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. L17-L20.

Astronomy and Astrophysics

Astrophysics

35

Astronomical Models, Dwarf Galaxies, Elliptical Galaxies, Galactic Mass, Globular Clusters, Virial Theorem, Astronomical Spectroscopy, Stellar Luminosity, Stellar Systems

Scientific paper

A sample of 17 low-mass elliptical and elliptical-like galaxies was built with accurate photometric and spectroscopic data. This sample, covering a wide range in surface brightness, is in or near the low-mass extension of the 'fundamental plane' defined by bright ellipticals, but shows a scatter which cannot be accounted for by measurement errors and which is thus probably due to a large variety of internal structures. Extending the analysis to globular clusters and dwarf spheroidals, it is found that they are also near or within the fundamental plane, except for two dwarfs suspected of having a high M/L. The range thus covered is 20 in absolute magnitude. These results suggest that the fundamental plane is a robust representation of the virial theorem, valid for ellipticals and for other types of pressure-supported stellar systems as well. It also indicates that the standard parameter relations are little sensitive to specific formation processes, local environment, and structural details, that may have an effect at a subtler level.

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