Hundreds of Low-Mass Active Galaxies in the Galaxy And Mass Assembly (GAMA) Survey
S. Salehirad (1), A. E. Reines (1), M. Molina (1,2) (1 Montana State, U., 2 U. of Utah)

TL;DR
This study identifies and characterizes 388 low-mass active galaxies with evidence of massive black holes, expanding understanding of black hole presence and activity in dwarf galaxies using deeper spectroscopic data.
Contribution
The paper presents a new, larger sample of low-mass active galaxies with detailed spectroscopic analysis, extending previous surveys to higher redshifts and lower masses.
Findings
Black holes in low-mass galaxies range from $10^{5}$ to $10^{7.7}$ solar masses.
Sample includes a diverse range of galaxy properties, from star-forming dwarfs to miniquasars.
Extended the redshift and mass range of known low-mass active galaxies.
Abstract
We present an entirely new sample of 388 low-mass galaxies () that have spectroscopic signatures indicating the presence of massive black holes (BHs) in the form of active galactic nuclei (AGNs) or tidal disruption events (TDEs). Of these, 70 have stellar masses in the dwarf galaxy regime with . We identify the active galaxies by analyzing optical spectra of a parent sample of 23,000 low-mass emission-line galaxies in the Galaxy and Mass Assembly (GAMA) Survey Data Release 4, and employing four different diagnostics based on narrow emission line ratios and the detection of high-ionization coronal lines. We find that 47 of the 388 low-mass active galaxies exhibit broad H in their spectra, corresponding to virial BH masses in the range with a median BH mass…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Astronomical Observations and Instrumentation
