Dwarf AGNs from Variability for the Origins of Seeds (DAVOS): Optical Variability of Broad-line Dwarf AGNs from the Zwicky Transient Facility

Abstract

We study the optical variability of a sample of candidate low-mass (dwarf ang Seyfert) active galactic nuclei (AGNs) using Zwicky Transient Facility g-band light curves. Our sample is compiled from broad-line AGNs in dwarf galaxies reported in the literature with single-epoch virial black hole (BH) masses in the range $M_{\mathrm{BH}}\sim 10^4$--$10^8{M}_{\odot }$. We measure the characteristic ``damping'' timescale of the optical variability ${\tau }_{\mathrm{DRW}}$, beyond which the power spectral density flattens, of a final sample of 79 candidate low-mass AGNs with high-quality light curves. Our results provide further confirmation of the $M_{\mathrm{BH}}-{\tau }_{\mathrm{DRW}}$ relation from Burke et al. 2022 within $1\sigma$ agreement, adding 78 new low-mass AGNs to the relation. The agreement suggests that the virial BH mass estimates for these AGNs are generally reasonable. We expect that the optical light curve of an accreting intermediate-mass black hole (IMBH) to vary with a rest-frame damping timescale of $\sim$ tens of hours, which could enable detection and direct mass estimation of accreting IMBHs in wide-field time-domain imaging surveys with sufficient cadence like with the Vera C. Rubin Observatory.

9 pages plus 6 appendix, 7 figures

References in corpus (20)

• The Host Galaxies and Classification of Active Galactic Nuclei
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• GW190521: A Binary Black Hole Merger with a Total Mass of $150M_{\odot }$
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• A New Sample of Low-mass Black Holes in Active Galaxies
• A characteristic optical variability timescale in astrophysical accretion disks
• Are the Variability Properties of the Kepler AGN Light Curves Consistent with a Damped Random Walk?
• Limitations on the recovery of the true AGN variability parameters using Damped Random Walk modeling
• Improving Damped Random Walk parameters for SDSS Stripe 82 Quasars with Pan-STARRS1
• Observational Signatures of High-Redshift Quasars and Local Relics of Black Hole Seeds
• Optical Variability of Quasars with 20-Year Photometric Light Curves
• Variability-selected intermediate mass black hole candidates in dwarf galaxies from ZTF and WISE
• The Mass of Quasars
• Dwarf AGNs from Optical Variability for the Origins of Seeds (DAVOS): Insights from the Dark Energy Survey Deep Fields
• Introducing the Search for Intermediate-mass Black-hole In Nearby Galaxy (SIBLING) Survey
• Multi-wavelength observations of SDSS J105621.45+313822.1, a broad-line, low-metallicity AGN
• Give Me a Few Hours: Exploring Short Timescales in Rubin Observatory Cadence Simulations
• Gaussian Process regression for astronomical time-series

Cited by in corpus (2)

• How can the optical variation properties of active galactic nuclei be unbiasedly measured?
• Scalable and Robust Multiband Modeling of AGN Light Curves in Rubin-LSST