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Double-double radio galaxies: remnants of merger of supermassive binary black holes | | F.K. Liu
; Xue-Bing Wu
; S.L. Cao
; | | Date: |
2 Oct 2003 | | Journal: | Mon.Not.Roy.Astron.Soc. 340 (2003) 411 | | Subject: | astro-ph | | Affiliation: | 1,2), Xue-Bing Wu and S.L. Cao ( Peking University, China; Chalmers University of Technology, Sweden; Beijing Normal University, China | | Abstract: | The activity of active galaxy may be triggered by the merge of galaxies and present-day galaxies are probably the product of successive minor mergers. The frequent galactic merges at high redshift imply that active galaxy harbors supermassive unequal-mass binary black holes in its center at least once during its life time. In this paper, we showed that the recently discovered double-lobed FR II radio galaxies are the remnants of such supermassive binary black holes. The inspiraling secondary black hole opens a gap in the accretion disk and removes the inner accretion disk when it merges into the primary black hole, leaving a big hole of about several hundreds of Schwarzschild radius in the vicinity of the post-merged supermassive black hole and leading to an interruption of jet formation. When the outer accretion disk slowly refills the big hole on a viscous time scale, the jet formation restarts and the interaction of the recurrent jets and the inter-galactic medium forms a secondary pair of lobes. We applied the model to a particular double-lobed radio source B1834+620 and showed that the orbit of the secondary is elliptical with a typical eccentricity $e simeq 0.68$ and the mass ratio $q$ of the secondary and the primary is $0.01 la q la 0.4$. The accretion disk is a standard $alpha$-disk with $0.01 la alpha la 0.04$ and the ratio of disk half height $H$ and radius $r$ is $delta simeq 0.01$. The model predicates that double-lobed radio structure forms only in FR II radio galaxies. | | Source: | arXiv, astro-ph/0310045 | | Services: | Forum | Review | PDF | Favorites | |
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