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Uncovering Dwarf AGN With TESS

Authors: Treiber, Helena P.; Hinkle, Jason T.; Fausnaugh, Michael M.; Shappee, Benjamin J.; Vallely, Patrick J.; ASAS-SN-TESS Team;

Uncovering Dwarf AGN With TESS

Abstract

We present the results of a systematic search for AGN in TESS light curves of dwarf galaxies. Evidence of short-term flux changes in dwarf galaxies can reveal an AGN even when emission line ratios fail to do so. Studies of dwarf AGN are essential for a general understanding of the relationship between black hole and galaxy evolution. The timescale from the commonly-used damped random walk model has been shown to correlate with black hole mass, but further studies are required to understand the physical processes driving this empirical model’s effectiveness. Partially because of this timescale relation, TESS is a unique tool for the identification of dwarf AGN; a light curve from a single sector can reveal adequate variability. We demonstrate a successful methodology that accounts for TESS systematics and contamination by variable stars. The newly-identified AGN help populate scaling relations at the low-mass end and demonstrate the crucial role of TESS in studies of dwarf AGN and AGN in general.

{"references": ["Baldassare et al. (2020). A Search for Optical AGN Variability in 35,000 Low-mass Galaxies with the Palomar Transient Factory", "Burke et al. (2020). Optical Variability of the Dwarf AGN NGC 4395 from the Transiting Exoplanet Survey Satellite", "Fausnaugh et al. (2021). Early-time Light Curves of Type Ia Supernovae Observed with TESS", "Tonry et al. (2018). The ATLAS All-Sky Stellar Reference Catalog", "Heinze et al. (2018). A First Catalog of Variable Stars Measured by the Asteroid Terrestrial-impact Last Alert System (ATLAS)", "Jayasinghe et al. (2021). The ASAS-SN catalogue of variable stars IX: The spectroscopic properties of Galactic variable stars", "Baldwin et al. (1981). Classification parameters for the emission-line spectra of extragalactic objects.", "Fernandes et al. (2011). A comprehensive classification of galaxies in the Sloan Digital Sky Survey: how to tell true from fake AGN?"]}

Keywords

Accretion, Extragalactic Astrophysics, Active Galactic Nuclei, Supermassive Black Holes

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