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Chi-kwan Chan is a computational astrophysicist working with cutting edge technologies to advance both theoretical and observational research. He has developed new algorithms to study magnetohydrodynamic turbulence, used graphics processing units (GPUs) to accelerate general relativistic ray tracing, designed cloud computing infrastructures to handle big observational data, and applied machine learning algorithms to speed up and automate data processing. Some of Chi-kwan's active projects include simulating and understanding accretion disks, capturing images of black holes, and visualizing astrophysical simulations in virtual reality. A true wildcat, Chi-kwan received his bachelors and doctoral degrees from the University of Arizona. He is also a Data Science Fellow at the UA Data Science Institute.Show Less
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Grants
- The Event Horizon Telescope: Resolving Black Holes in Time and Space
Co-Investigator (COI)
2020
$1.9M
Active - Advanced Debris Disk Modeling for the Next Decade
Co-Investigator (COI)
2020
$328.6K
Active - TRIPODS+X:VIS: Data Science Pathways for a Vibrant TRIPODS Commons at Scale
Key Personnel (KP)
2018
$199.9K
Active - PIRE: Black Hole Astrophysics in the Era of Distributed Resources and Expertise
Principal Investigator (PI)
2017
$5.7M
Active - Collaborative Research: EAGER: A High Throughput Science Gateway for the Event Horizon Telescope
Principal Investigator (PI)
2023
$99.0K
News
- Making sense of the nonsensical: Black holes and the simulation library
2022
- Black hole scientist: 'Wherever we look, we should see donuts'
2022
- UArizona astronomers lead efforts that reveal the black hole at the heart of our galaxy
2022
- Astronomers Image Magnetic Fields at the Edge of M87's Black Hole
2021
- Event Horizon Telescope Pinpoints Heart of the Nearest Radio Galaxy
2021
- $3M Breakthrough Prize Goes to Black Hole Hunters Including UA Astrophysicists
2019
- 21 UA Students Contributed to Global Effort Resulting in First Black Hole Image
2019
- Chasing Einstein's Shadow: UA Helps Capture First Image of a Black Hole
2019
- UA Leads Project on Big Data and Black Holes
2018
- Black Holes Come to the Big Screen
2014
Publications (57)
Recent
- FANTASY: User-friendly Symplectic Geodesic Integrator for Arbitrary Metrics with Automatic Differentiation
2021
- First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
2021
- Polarimetric Properties of Event Horizon Telescope Targets from ALMA
2021
- The Polarized Image of a Synchrotron-emitting Ring of Gas Orbiting a Black Hole
2021
- Constraints on black-hole charges with the 2017 EHT observations of M87*
2021
- Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign
2021
- Ten simple rules to cultivate transdisciplinary collaboration in data science.
2021
- First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
2021
- Event Horizon Telescope imaging of the archetypal blazar 3C 279 at an extreme 20 microarcsecond resolution
2020
- A Plasmoid Model for the Sgr A* Flares Observed with GRAVITY and Chandra
2020
- Verification of Radiative Transfer Schemes for the EHT
2020
- SYMBA: An end-to-end VLBI synthetic data generation pipeline: Simulating Event Horizon Telescope observations of M 87
2020
- Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
2020
- Markov Chains for Horizons (MARCH). I. Identifying Biases in Fitting Theoretical Models to Event Horizon Telescope Observations
2020
- Discretization and Filtering Effects on Black Hole Images Obtained with the Event Horizon Telescope
2020
- Monitoring the Morphology of M87* in 2009-2017 with the Event Horizon Telescope
2020
- EHT-HOPS Pipeline for Millimeter VLBI Data Reduction
2019
- First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
2019
- First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
2019
- First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
2019
- Sustaining Community-Driven Software for Astronomy in the 2020s
2019
- The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project
2019
- First M87 Event Horizon Telescope Results and the Role of ALMA
2019
- Prospects for Wideband VLBI Correlation in the Cloud
2019
- First M87 Event Horizon Telescope Results. II. Array and Instrumentation
2019
- Elevating the Role of Software as a Product of the Research Enterprise
2019
- First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
2019
- Training the Future Generation of Computational Researchers
2019
- The Growing Importance of a Tech Savvy Astronomy and Astrophysics Workforce
2019
- First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
2019
- GRMHD Simulations of Visibility Amplitude Variability for Event Horizon Telescope Images of Sgr A
2018
- The Properties of Reconnection Current Sheets in GRMHD Simulations of Radiatively Inefficient Accretion Flows
2018
- GRay2: A General Purpose Geodesic Integrator for Kerr Spacetimes
2018
- Variability in GRMHD Simulations of Sgr A∗: Implications for EHT Closure Phase Observations
2017
- PARTICLE ACCELERATION AND THE ORIGIN OF X-RAY FLARES IN GRMHD SIMULATIONS OF SGR A*
2016
- Persistent Asymmetric Structure of Sagittarius A* on Event Horizon Scales
2016
- BAYESIAN TECHNIQUES FOR COMPARING TIME-DEPENDENT GRMHD SIMULATIONS TO VARIABLE EVENT HORIZON TELESCOPE OBSERVATIONS
2016
- A General Relativistic Null Hypothesis Test with Event Horizon Telescope Observations of the black-hole shadow in Sgr A*
2015
- The power of imaging: Constraining the plasma properties of grmhd simulations using eht observations of Sgr A∗
2015
- Erratum: “The Power of Imaging: Constraining the Plasma Properties of GRMHD Simulations using EHT Observations of Sgr A*” (2015, ApJ, 799, 1)
2015
- FAST VARIABILITY AND MILLIMETER/IR FLARES IN GRMHD MODELS OF Sgr A* FROM STRONG-FIELD GRAVITATIONAL LENSING
2015
- Angular Momentum Transport in Accretion Disk Boundary Layers Around Weakly Magnetized Stars
2013
- GRay: a Massively Parallel GPU-Based Code for Ray Tracing in Relativistic Spacetimes
2013
- ON HYDROMAGNETIC STRESSES IN ACCRETION DISK BOUNDARY LAYERS
2012
- On magnetohydrodynamic turbulence and angular momentum transport in accretion disk boundary layers
2012
- Dynamics of saturated energy condensation in two-dimensional turbulence.
2012
- A CLASS OF PHYSICALLY MOTIVATED CLOSURES FOR RADIATION HYDRODYNAMICS
2011
- OSCILLATIONS OF THE INNER REGIONS OF VISCOUS ACCRETION DISKS
2009
- MHD SIMULATIONS OF ACCRETION ONTO Sgr A*: QUIESCENT FLUCTUATIONS, OUTBURSTS, AND QUASIPERIODICITY
2009
- SPECTRAL METHODS FOR TIME-DEPENDENT STUDIES OF ACCRETION FLOWS. III. THREE-DIMENSIONAL, SELF-GRAVITATING, MAGNETOHYDRODYNAMIC DISKS
2009
- Viscous, Resistive Magnetorotational Modes
2008
- The fundamental difference between shear alpha viscosity and turbulent magnetorotational stresses
2007
- ANGULAR MOMENTUM TRANSPORT IN ACCRETION DISKS: SCALING LAWS IN MRI-DRIVEN TURBULENCE
2007
- Spectral Methods for Time-dependent Studies of Accretion Flows. II. Two-dimensional Hydrodynamic Disks with Self-Gravity
2006
- The signature of the magnetorotational instability in the Reynolds and Maxwell stress tensors in accretion discs
2006
- Local model for angular-momentum transport in accretion disks driven by the magnetorotational instability.
2006
- Spectral Methods for Time-dependent Studies of Accretion Flows. I. Two-dimensional, Viscous, Hydrodynamic Disks
2005