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Tidal disruptions in circumbinary disks. II: Observational signatures in the reverberation spectra

MPG-Autoren

Brem,  Patrick
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Amaro-Seoane,  Pau
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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1407.3791.pdf
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Zitation

Brem, P., Cuadra, J., Amaro-Seoane, P., & Komossa, S. (2014). Tidal disruptions in circumbinary disks. II: Observational signatures in the reverberation spectra. The Astrophysical Journal, 792(2): 100. doi:10.1088/0004-637X/792/2/100.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0024-7592-3
Zusammenfassung
Supermassive Binary Black Holes (SMBBHs) with sub-pc separations form in the course of galaxy mergers, if both galaxies harbour massive black holes. Clear observational evidence for them however still eludes us. We propose a novel method of identifying these systems by means of reverberation mapping their circumbinary disk after a tidal disruption event has ionized it. The tidal disruption of a star at the secondary leads to strong asymmetries in the disk response. We model the shape of the velocity--delay maps for various toy disk models and more realistic gas distributions obtained by SPH simulations. The emissivity of the ionized disk is calculated with {\em Cloudy}. We find peculiar asymmetries in the maps for off center ionizing sources that may help us constrain geometrical parameters of a circumbinary disk such as semi-major axis and orbital phase of the secondary, as well as help strengthen the observational evidence for sub-parsec SMBBHs as such.