Parsecscale Radio Cores in Early Type Galaxies

Details Parsecscale Radio Cores in Early Type Galaxies Parsecscale Radio Cores in Early Type Galaxies

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..928s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 4/AUG15, P. 928, 1994

Astronomy and Astrophysics

Astronomy

96

Scientific paper

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 (10^21^-,10^26^ W Hz^-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_core_ is proportional to P_total_^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.

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