Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.349..138r&link_type=abstract
Nature (ISSN 0028-0836), vol. 349, Jan. 10, 1991, p. 138-140.
Astronomy and Astrophysics
Astronomy
425
Astronomical Models, Extragalactic Radio Sources, Radio Jets (Astronomy), Accretion Disks, Balmer Series, Black Holes (Astronomy), Luminous Intensity, Photoionization, Radio Galaxies
Scientific paper
The discovery is reported of a close relationship between the total kinetic power Q and the narrow-line luminosity of jets driven by a central engine in an extragalactic radio source. The relationship is an approximate proportionality which extends over four orders of magnitude from low-Q radio sources with relaxed structures to high-Q, radio-luminous classical double-lobe radio galaxies. Objects with broad Balmer lines follow the same trend as those without, showing that quasarlike photoionizing sources are ubiquitous but not always obvious. Moreover, all radio-source central engines channel at least as much power into the jets as is radiated by accretion. This high efficiency implies that the engine is a massive spinning black hole which both powers the jets and controls the accretion rate.
Rawlings Steve
Saunders Richard
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