Journal
PHYSICAL REVIEW D
Volume 80, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.80.024012
Keywords
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Funding
- NSF [PHY-0803629, PHY-0653375]
- NASA [NNX07AG84G, PHY-0803615, CCF-0832966, PHY-0803624, CCF-0833090]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0803615] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0803629, 0803624] Funding Source: National Science Foundation
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The merger process of a binary black hole system can have a strong impact on a circumbinary disk. In the present work we study the effect of both central mass reduction (due to the energy loss through gravitational waves) and a possible black hole recoil (due to asymmetric emission of gravitational radiation). For the mass reduction case and recoil directed along the disk's angular momentum, oscillations are induced in the disk which then modulate the internal energy and bremsstrahlung luminosities. On the other hand, when the recoil direction has a component orthogonal to the disk's angular momentum, the disk's dynamics are strongly impacted, giving rise to relativistic shocks. The shock heating leaves its signature in our proxies for radiation, the total internal energy and bremsstrahlung luminosity. Interestingly, for cases where the kick velocity is below the smallest orbital velocity in the disk (a likely scenario in real active galactic nuclei), we observe a common, characteristic pattern in the internal energy of the disk. Variations in kick velocity simply provide a phase offset in the characteristic pattern implying that observations of such a signature could yield a measure of the kick velocity through electromagnetic signals alone.
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