peer reviewedWe report periodic oscillations in the 15-year long optical light curve of the gravitationally lensed quasar QJ0158-4325. The signal is enhanced during a high magnification microlensing event undergone by the fainter lensed image of the quasar, between 2003 and 2010. We measure a period of $P_{o}=172.6\pm0.9$ days. We explore four scenarios to explain the origin of the periodicity: 1- the high magnification microlensing event is due to a binary star in the lensing galaxy, 2- QJ0158-4325 contains a massive binary black hole system in its final dynamical stage before merging, 3- the quasar accretion disk contains a bright inhomogeneity in Keplerian motion around the black hole, and 4- the accretion disk is in precession....
We calculate the light curves of galactic bulge stars magnified via microlensing by stellar-mass bin...
peer reviewedGravitational microlensing is a powerful tool for probing the inner structure of strong...
There are increasing interests in binary supermassive black holes (SMBHs), but merging binaries with...
We report periodic oscillations in the 15-year long optical light curve of the gravitationally lense...
Binary supermassive black holes (BSBHs) are expected to be a generic byproduct from hierarchical gal...
Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuc...
Supermassive black hole binaries (SMBHBs) should be common in galactic nuclei as a result of frequen...
Context. Observations of the effect of microlensing in gravitationally lensed quasars could potentia...
Hierarchical assembly models predict a population of supermassive black hole (SMBH) binaries. These ...
We propose that relative variability on short time-scales of the multiple images of a lensed quasar,...
The advent of time domain astronomy is revolutionizing our understanding of the universe. Programs s...
We assess the effects of supermassive black hole (SMBH) environments on the gravitational wave (GW) ...
Large-area sky surveys show that massive galaxies undergo at least one major merger in a Hubble time...
With the detection of black hole mergers by the LIGO gravitational wave telescope, there has been in...
Sub-parsec binary massive black holes (BBHs) have long been thought to exist in many QSOs but remain...
We calculate the light curves of galactic bulge stars magnified via microlensing by stellar-mass bin...
peer reviewedGravitational microlensing is a powerful tool for probing the inner structure of strong...
There are increasing interests in binary supermassive black holes (SMBHs), but merging binaries with...
We report periodic oscillations in the 15-year long optical light curve of the gravitationally lense...
Binary supermassive black holes (BSBHs) are expected to be a generic byproduct from hierarchical gal...
Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuc...
Supermassive black hole binaries (SMBHBs) should be common in galactic nuclei as a result of frequen...
Context. Observations of the effect of microlensing in gravitationally lensed quasars could potentia...
Hierarchical assembly models predict a population of supermassive black hole (SMBH) binaries. These ...
We propose that relative variability on short time-scales of the multiple images of a lensed quasar,...
The advent of time domain astronomy is revolutionizing our understanding of the universe. Programs s...
We assess the effects of supermassive black hole (SMBH) environments on the gravitational wave (GW) ...
Large-area sky surveys show that massive galaxies undergo at least one major merger in a Hubble time...
With the detection of black hole mergers by the LIGO gravitational wave telescope, there has been in...
Sub-parsec binary massive black holes (BBHs) have long been thought to exist in many QSOs but remain...
We calculate the light curves of galactic bulge stars magnified via microlensing by stellar-mass bin...
peer reviewedGravitational microlensing is a powerful tool for probing the inner structure of strong...
There are increasing interests in binary supermassive black holes (SMBHs), but merging binaries with...