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We find compact (<0. 03 arcsec) radio-continuum cores in about 70 per cent of radio-emitting elliptical and S0 galaxies over a wide range in total radio power (1021–1026 WHz–1 at 5 GHz). The cores usually have a flat or rising spectrum between 2. 3 and 8. 4 GHz, with a median spectral index of + 0. 3. Even at low luminosities, the radio emission from most elliptical galaxies appears to be powered by a parsec-scale ‘engine’ like those in classical radio galaxies and quasars. The core and total radio power are related (|P{₂₎ₑ₄}\, \, Pₓ₎ₓ₀₋^0. 7| on average), and the parsec-scale cores of radio galaxies are typically one hundred times more powerful than those in ‘normal’ giant elliptical galaxies.
Slee et al. (Mon,) studied this question.