Tidal Disruption from Supermassive Black Hole Binaries in Merging Galaxies:

Before & After the Coalescence

Shuo LiNAOC

Collaborated with

Rainer Spurzem, F. K. Liu, Peter Berczik, Xian Chen & Stefanie Komossa

2014. 04. 30.

Evolution of Supermassive Black Hole Binaries

GW

~10kpc

Hudson et al., 2006

~kpc

Komossa et al., 2003

~10pc

Rodrigue et al., 2006

Begelman et. al., 1980.

Art by Xian Chen3C75

0402+379NGC6240

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Tidal Disruption

• BH’s tidal gravity conquer star’s self gravity:

– Tidal radius:

105M⊙106M⊙

107M⊙

108M⊙

Linda Strubbe

NASA/CXC/M.Weiss

04/18/23

Tidal Disruption• Tidal Flare

– Mass distribution during tidal disruption (TD):

– Re-falling rate:

– Luminosity:

Evans et.al., APJ 1989, 346 L13

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TD in SMBHB Systems

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TD in SMBHB Systems

• A triple system is hierarchical and stable when (Mardling & Aarseth 2001):

• The accretion interrupts at a time Ttr :

η ~ 0.27 in average theoretically. Our simulation results have η ~ 0.25.

Liu, F. K.; Li, S. & Chen, X., 2009,

Art Credit: ESA - C. Carreau 04/18/23

TD in SMBHB Systems

• A triple system is hierarchical and stable when (Mardling & Aarseth 2001):

• The accretion interrupts at a time Ttr :

η ~ 0.27 in average theoretically. Our simulation results have η ~ 0.25.

Liu, F. K.; Li, S. & Chen, X., 2009,

Art Credit: ESA - C. Carreau 04/18/23

MBH=107M⊙,e = 0.3,q = 0.08,T = 150 daysa ~ 0.59mpc ~ 620rg

SDSS J120136.02+300305.5

Liu, F. K., Li, S. & Komossa, S., 2014

Tidal Disruption of Recoiling SMBH

Phase I

Phase II

• Boosted TD events around density center in phase I:

Higher stellar density;

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Li, S., Liu, F. K., Berczik, P., Chen, X. & Spurzem, R., 2012

Tidal Disruption of Recoiling SMBH

• Boosted TD events around density center in phase I:

Higher stellar density;

• Monotonic increasing TD rates for recoiling SMBH in phase I:

• Constant TD rates for stationary SMBH and recoiling BH in phase II:

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Summary

• The SMBHBs in normal galaxies are hard to detect;

• TD can be a very powerful tool to study SMBHBs in quiescent galaxies;

– Boosted TD rates in merging galaxies;– The truncation of TD light curve can be used to distinguish

SMBHB;– Boosted TD rates for recoiling SMBHB passing by galactic

center;

• Large scale survey like LSST is very important;

• Long term follow up observation is very important.

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