Galactic jet sources and the AGN connection

Heino Falcke and Peter L. Biermann

Max-Planck Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

(1996), Astronomy & Astrophysics Vol. 308, p. 321


In order to further test our hypothesis that jets and disk around compact accreting objects are symbiotic features we investigate the newly discovered superluminal galactic radio jets GRS 1915+105 and GRO J1655-40 and the two famous galactic radio jets 1E1740-2942 and SS 433 within the framework of our couple jet/disk model developed initially for active galactic nuclei (AGN) and the galactic center source Sgr A*. By comparing the ``disk'' and radio core luminosity of those galactic jet sources with our model prediction we can show that they can easily be understood as AGN-like jets where the accretion power onto a central compact object is scaled down by several orders of magnitude. The total power of the jets must be comparable to the disk luminosity - at least for the superluminal sources.

To broaden our view we also shortly discuss the situation in other galactic flat spectrum radio source associated with compact objects -- the X-ray binaries Cyg X-1, Cyg X-2, Cyg X-3 and Sco X-1 -- where a jet origin has been proposed earlier on theoretical grounds. In an disk/radio luminosity their radio cores also fall within our model prediction for scaled down radio loud and radio weak AGN-jets. Taking all sources together and comparing their $L_{\rm disk}$/radio ratio we find an indication for a similar radio loud/radio weak dichotomy as found earlier for quasar radio cores, however, a larger number of galactic jet sources is needed to confirm this trend.

Paper: Available in PostScript and Tex Format.

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