Radio Crickets: Chirping Jets from Black Hole Binaries Entering their Gravitational Wave Inspiral

摘要: We study a novel electromagnetic signature of supermassive black hole binaries whose inspiral starts being dominated by gravitational wave (GW) emission. Recent simulations suggest that the binary's member BHs can continue to accrete gas from circumbinary accretion disk in this phase evolution, all way until coalescence. If one binary members produces radio jet as result accretion, precesses along biconical surface due orbital motion. When enters GW its opening angle widens, exhibits milliarcsecond scale wiggles, and conical precession is twisted apparant superluminal The rapidly increasing velocity gives an appearance "chirp." This helical chirping morphology be used infer parameters. For with mass 10^7--10^10 Msun at redshifts z<0.5, monitoring these features current archival data will place lower limit on sources could detected eLISA Pulsar Timing Arrays. In future, microarcsecond interferometry Square Kilometer Array increase potential usefulness technique.