144 citations · 913 across the 22 of their papers we have counts for
22 papers
A model for the enhanced production rate of early-type hypervelocity stars in the Galactic halo
Chunyang Cao, F. K. Liu, Xian Chen +1
About twenty late B-type hypervelocity stars (HVSs) traveling faster than the Galactic escape velocity have been discovered in the Galactic halo, many of which were ejected from th…
An Intermediate-mass Black Hole Lurking in A Galactic Halo Caught Alive during Outburst
C. -C. Jin, D. -Y. Li, N. Jiang +137
Stellar-mass and supermassive black holes abound in the Universe, whereas intermediate-mass black holes (IMBHs) of ~10^2-10^5 solar masses in between are largely missing observatio…
Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios
S. Komossa, D. Grupe, A. Kraus +9
The project MOMO (Multiwavelength Observations and Modelling of OJ 287) was set up to test predictions of binary supermassive black hole (SMBH) scenarios and to understand disk-jet…
MOMO VI: Multifrequency radio variability of the blazar OJ 287 from 2015-2022, absence of predicted 2021 precursor-flare activity, and a new binary interpretation of the 2016/2017 outburst
S. Komossa, A. Kraus, D. Grupe +12
Based on our dedicated Swift monitoring program, MOMO, OJ 287 is one of the best-monitored blazars in the X-ray--UV--optical regime. Here, we report results from our accompanying,…
Tracing the Evolution of SMBHs and Stellar Objects in Galaxy Mergers: An Multi-mass Direct N-body Model
Shuo Li, Shiyan Zhong, Peter Berczik +3
By using direct N-body numerical simulations, we model the dynamical co-evolution of two supermassive black holes (SMBHs) and the surrounding stars in merging galaxies. In order to…
Milli-Hertz Gravitational Wave Background Produced by Quasi-Periodic Eruptions
Xian Chen, Yu Qiu, Shuo Li +1
Extreme-mass-ratio inspirals (EMRIs) are important targets for future space-borne gravitational-wave (GW) detectors, such as the Laser Interferometer Sapce Antenna (LISA). Recent w…
Measuring black hole masses from tidal disruption events and testing the relation
Z. Q. Zhou, F. K. Liu, S. Komossa +4
Liu and collaborators recently proposed an elliptical accretion disk model for tidal disruption events (TDEs). They showed that the accretion disks of optical/UV TDEs are large and…
A large accretion disk of extreme eccentricity in the TDE ASASSN-14li
R. Cao, F. K. Liu, Z. Q. Zhou +2
In the canonical model for tidal disruption events (TDEs), the stellar debris circularizes quickly to form an accretion disk of size about twice the orbital pericenter of the star.…
Disk origin of broad optical emission lines of the TDE candidate PTF09djl
F. K. Liu, Z. Q. Zhou, R. Cao +2
An otherwise dormant supermassive black hole (SMBH) in a galactic nucleus flares up when it tidally disrupts a star passing by. Most of the tidal disruption events (TDEs) and candi…
Growth of supermassive black holes, galaxy mergers and supermassive binary black holes
S. Komossa, J. G. Baker, F. K. Liu
The study of galaxy mergers and supermassive binary black holes (SMBBHs) is central to our understanding of the galaxy and black hole assembly and (co-)evolution at the epoch of st…
Boosted Tidal Disruption by Massive Black Hole Binaries During Galaxy Mergers FROM The View of N-Body Simulation
Shuo Li, F. K. Liu, Peter Berczik +1
Supermassive black hole binaries (SMBHBs) are productions of the hierarchical galaxy formation model. There are many close connections between central SMBH and its host galaxy beca…
A milliparsec supermassive black hole binary candidate in the galaxy SDSS J120136.02+300305.5
F. K. Liu, Shuo Li, S. Komossa
Galaxy mergers play a key role in the evolution of galaxies and the growth of their central supermassive black holes (SMBHs). A search for (active) SMBH binaries (SMBHBs) at the ce…
Enhanced off-center stellar tidal disruptions by supermassive black holes in merging galaxies
F. K. Liu, Xian Chen
Off-center stellar tidal disruption flares have been suggested to be a powerful probe of recoiling supermassive black holes (SMBHs) out of galactic centers due to anisotropic gravi…
Is there an intermediate massive black hole in the Galactic center: Imprints on the stellar tidal-disruption rate
Xian Chen, F. K. Liu
It has been suggested that an intermediate-massive black hole (IMBH) with mass could fall into the galactic center (GC) and form a massive black hole binary (MBH…
Interaction of Recoiling Supermassive Black Holes with Stars in Galactic Nuclei
Shuo Li, F. K. Liu, Peter Berczik +2
Supermassive black hole binaries (SMBHBs) are the products of frequent galaxy mergers. The coalescence of the SMBHBs is a distinct source of gravitational wave (GW) radiation. The…
Recoiling Supermassive Black Holes in Spin-flip Radio Galaxies
F. K. Liu, Dong Wang, Xian Chen
Numerical relativity simulations predict that coalescence of supermassive black hole (SMBH) binaries not only leads to a spin flip but also to a recoiling of the merger remnant SMB…
Estimating black hole masses of blazars
Xue-Bing Wu, F. K. Liu, M. Z. Kong +2
Estimating black hole masses of blazars is still a big challenge. Because of the contamination of jets, using the previously suggested size -- continuum luminosity relation can ove…
Interruption of Tidal Disruption Flares By Supermassive Black Hole Binaries
F. K. Liu, S. Li, Xian Chen
Supermassive black hole binaries (SMBHBs) are products of galaxy mergers, and are important in testing Lambda cold dark matter cosmology and locating gravitational-wave-radiation s…
Enhanced tidal disruption rates from massive black hole binaries
X. Chen, P. Madau, A. Sesana +1
"Hard" massive black hole (MBH) binaries embedded in steep stellar cusps can shrink via three-body slingshot interactions. We show that this process will inevitably be accompanied…
XMM-Newton view of PKS 2155-304: hardness ratio and cross-correlation analysis of EPIC pn observations
Y. H. Zhang, A. Treves, L. Maraschi +2
With currently available XMM-Newton EPIC pn observations spanned over about 3 years, we present a detailed spectral and temporal variability of the 0.2--10 keV X-ray emission from…
The long-term optical behavior of MRK421
F. K. Liu, B. F. Liu, G. Z. Xie
All data available in B band for the BL Lac object MRK421 from 22 publications are used to construct a historical light curve, dating back to 1900. It is found that the light curve…
Polytropic gas spheres: An approximate analytic solution of the Lane-Emden equation
F. K. Liu
Polytropic models play a very important role in galactic dynamics and in the theory of stellar structure and evolution. However, in general, the solution of the Lane-Emden equation…