News from the isolated ellipticals NGC 5812, NGC 7507, and NGC 7796
Tom Richtler, Ricardo Salinas, Richard Lane, Michael Hilker, Juan, Pablo Caso, Lilia P. Bassino
TL;DR
This study examines the globular cluster systems and dark matter halos of isolated elliptical galaxies NGC 5812, NGC 7507, and NGC 7796 through photometric and spectroscopic analysis, revealing dark halos in NGC 7796 but not in the others.
Contribution
It provides new insights into the dark matter content of isolated ellipticals by combining globular cluster kinematics with galaxy light analysis.
Findings
Dark halos are detected in NGC 7796.
No dark halos are found in NGC 5812 and NGC 7507.
Globular cluster systems vary among the studied galaxies.
Abstract
We report on ongoing photometric and spectroscopic work on a sample of isolated elliptical galaxies. We investigate their globular cluster systems, and use the kinematics of globular clusters and the integrated galaxy light to constrain their dark halos, which are not found in the cases of NGC 5812 and NGC 7507
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