2025
Too Quiet for Comfort: Local Little Red Dots Lack Variability over Decades
Colin Burke, Zachary Stone, et al.
ApJaccepted (2025)
We investigate the photometric and spectroscopic variability of three local Little Red Dot analogs over the course of decades.
Too Quiet for Comfort: Local Little Red Dots Lack Variability over Decades
Colin Burke, Zachary Stone, et al.
ApJaccepted (2025)
We investigate the photometric and spectroscopic variability of three local Little Red Dot analogs over the course of decades.
NEXUS: A Search for Nuclear Variability with the First Two JWST NIRCam Epochs
Zachary Stone, Yue Shen, et al.
submitted (2025)
We perform difference image photometry between thw first two NIRCam epochs of the NEXUS JWST survey on high-redshift nuclear transients.
NEXUS: A Search for Nuclear Variability with the First Two JWST NIRCam Epochs
Zachary Stone, Yue Shen, et al.
submitted (2025)
We perform difference image photometry between thw first two NIRCam epochs of the NEXUS JWST survey on high-redshift nuclear transients.
The SDSS-V Black Hole Mapper Reverberation Mapping Project: Multi-Line Dynamical Modeling of a Highly Variable Active Galactic Nucleus with Decade-long Light Curves
Zachary Stone, Yue Shen, et al.
ApJ, 991, 218 (2025)
We model the geometric and kinematics of gas within the broad-line region of a particularly variable quasar with simultaneous photometry and spectroscopy from the SDSS Black Hole Mapper.
The SDSS-V Black Hole Mapper Reverberation Mapping Project: Multi-Line Dynamical Modeling of a Highly Variable Active Galactic Nucleus with Decade-long Light Curves
Zachary Stone, Yue Shen, et al.
ApJ, 991, 218 (2025)
We model the geometric and kinematics of gas within the broad-line region of a particularly variable quasar with simultaneous photometry and spectroscopy from the SDSS Black Hole Mapper.
TempMap: A package following Stone & Shen (2023) for AGN accretion disk temperature fluctuation maps
Zachary Stone
Zenodo, 10.5281/zenodo.17459592 (2025)
Software for estimating temperature fluctuation maps in AGN accretion disks.
TempMap: A package following Stone & Shen (2023) for AGN accretion disk temperature fluctuation maps
Zachary Stone
Zenodo, 10.5281/zenodo.17459592 (2025)
Software for estimating temperature fluctuation maps in AGN accretion disks.
2024
The Sloan Digital Sky Survey Reverberation Mapping Project: Key Results
Yue Shen, Catherine Grier, Keith Horne, Zachary Stone, et al.
ApJS, 272, 26 (2024)
We obtain black hole mass measurements for nearly 1000 quasars with over a decade of SDSS data out to a redshift z ~ 4.
The Sloan Digital Sky Survey Reverberation Mapping Project: Key Results
Yue Shen, Catherine Grier, Keith Horne, Zachary Stone, et al.
ApJS, 272, 26 (2024)
We obtain black hole mass measurements for nearly 1000 quasars with over a decade of SDSS data out to a redshift z ~ 4.
PyPETaL: A Pipeline for Estimating AGN Time Lags
Zachary Stone
Astrophysics Source Code Library, ascl:2401.004 (2024)
A software pipeline for computing time lags in multi-band time-series data.
PyPETaL: A Pipeline for Estimating AGN Time Lags
Zachary Stone
Astrophysics Source Code Library, ascl:2401.004 (2024)
A software pipeline for computing time lags in multi-band time-series data.
2023
Temperature Fluctuations in Quasar Accretion Discs from Spectroscopic Monitoring Data
Zachary Stone, Yue Shen
MNRAS, 524, 4521 (2023)
We use mutli-epoch spectroscopy of ~1000 SDSS quasars to measure temperature fluctuations within the accretion disk, finding evidence for slow-moving waves generated within the disk.
Temperature Fluctuations in Quasar Accretion Discs from Spectroscopic Monitoring Data
Zachary Stone, Yue Shen
MNRAS, 524, 4521 (2023)
We use mutli-epoch spectroscopy of ~1000 SDSS quasars to measure temperature fluctuations within the accretion disk, finding evidence for slow-moving waves generated within the disk.
2022
Optical Variability of Quasars with 20-Yr Photometric Light Curves
Zachary Stone, Yue Shen, et al.
MNRAS, 514, 164 (2022)
We measure the optical photometric variability of nearly 200 quasars in the Stripe-82 legacy field with 20 year long light curves across multiple surveys.
Optical Variability of Quasars with 20-Yr Photometric Light Curves
Zachary Stone, Yue Shen, et al.
MNRAS, 514, 164 (2022)
We measure the optical photometric variability of nearly 200 quasars in the Stripe-82 legacy field with 20 year long light curves across multiple surveys.