Activity in elliptical galaxies |
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| Affiliation: | 1. Queensland Children''s Medical Research Institute, University of Queensland, Queensland Children''s Respiratory Centre, Royal Children''s Hospital, Brisbane, Queensland, Australia;2. Division of Respirology, Keenan Research Centre, Li Ka Shing Knowledge Institute, St. Michael''s Hospital, University of Toronto, Toronto, ON, Canada |
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| Abstract: | Elliptical galaxies exhibit a continuum of behaviour between ‘normal’ and highly active objects, with no clear dividing line between the two classes. High-resolution radio observations show that many bright ellipticals contain parsec-scale radio cores which are qualitatively similar to the central engines of radio galaxies but up to a million times less powerful. In contrast, the radio cores of spiral galaxies are qualitatively different from those in ellipticals, providing some clues to why radio galaxies are always ellipticals rather than spirals. |
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