Resolving the Vicinity of Supermassive Black Holes with Gravitational Microlensing

Abstract

In the near future, wide field surveys will discover 1000's of new strongly lensed quasars, and these will be monitored with unprecedented cadence by the Legacy Survey of Space and Time (LSST). Many of these will undergo caustic-crossing microlensing events over the 10-year LSST survey, in which a sharp caustic feature from a stellar body in the lensing galaxy crosses the inner accretion disk. Caustic-crossing events offer the unique opportunity to probe the vicinity of the central supermassive black hole for 100s of quasars with multi-platform follow-up triggered by LSST monitoring. To prepare for these observations, we have developed detailed simulations of caustic-crossing light curves. These employ a realistic analytic model of the inner accretion disk that reveals the strong surface brightness asymmetries introduced when fully accounting for both special- and general-relativistic effects. We demonstrate that an inflection in the caustic-crossing light curve due to the innermost stable circular orbit (ISCO) can be detected in reasonable follow-up observations and can be analyzed to constrain ISCO size. We also demonstrate that a convolutional neural network can be trained to predict ISCO size more reliably than traditional approaches and can also recover source orientation with high accuracy.

18 pages, 17 figures

References in corpus (25)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• A luminous quasar at a redshift of z = 7.085
• Active Galactic Nuclei: what's in a name?
• Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
• Reverberation mapping of Active Galactic Nuclei: from X-ray corona to dusty torus
• Sizes and Temperature Profiles of Quasar Accretion Disks from Chromatic Microlensing
• Microlensing variability in the gravitationally lensed quasar QSO 2237+0305 = the Einstein Cross. II. Energy profile of the accretion disk
• Multi-wavelength study of the gravitational lens system RXS J1131-1231: III. Long slit spectroscopy: micro-lensing probes the QSO structure
• The multiple quasar Q2237+0305 under a microlensing caustic
• A microlensing study of the accretion disc in the quasar MG 0414+0534
• UV/optical disk thermal reverberation in AGN: an in-depth study with an analytic prescription for the time-lag spectra
• Teraflop per second gravitational lensing ray-shooting using graphics processing units
• Accretion Disk Sizes from Continuum Reverberation Mapping of AGN Selected from the ZTF Survey
• Measuring the Innermost Stable Circular Orbits of Supermassive Black Holes
• AGN Continuum Reverberation Mapping Based on Zwicky Transient Facility Light Curves
• Self-lensing flares from black hole binaries I: general-relativistic ray tracing of black hole binaries
• Classification of Broad Absorption Line Quasars with a Convolutional Neural Network
• A Rapidly Spinning Black Hole Powers the Einstein Cross
• Quasar microlensing light curve analysis using deep machine learning
• Investigating the impact of vertically extended coronae on X-ray reverberation mapping
• Constraining quasar structure using high-frequency microlensing variations and continuum reverberation
• Deep Learning in Searching the Spectroscopic Redshift of Quasars
• Stellar transits in active galactic nuclei
• Microlensing of strongly lensed quasars

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• A GPU Code for Finding Microlensing Critical Curves and Caustics
• Simulating quasar microlensing light curves: High magnification events
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