A New Limit to the Size of the Radio Nucleus of NGC 5128

Details A New Limit to the Size of the Radio Nucleus of NGC 5128 A New Limit to the Size of the Radio Nucleus of NGC 5128

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...475l..93k&link_type=abstract

Astrophysical Journal Letters v.475, p.L93

Physics

22

Radio Continuum: Galaxies, Galaxies: Nuclei, Galaxies: Individual Ngc Number: Ngc 5128, Black Hole Physics

Scientific paper

We have measured the size of the compact radio nucleus of the giant radio galaxy Centaurus A (NGC 5128) as 0.5 +/- 0.1 milliarcseconds. The corresponding linear dimensions of 0.01 pc ~ 10 light-days ~ 1016 cm make this the smallest known extragalactic radio source. If the radio lobes are powered by a massive central engine, such as a black hole, their large total energy content combined with our measurement of the size of the central radio source, suggest that the central mass density may have exceeded 5 x 1013 Msolar pc-3, a value far larger than has been determined for any other active galactic nucleus or quasar.

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