The most luminous, merger-free AGN show only marginal correlation with bar presence

The role of large-scale bars in the fuelling of active galactic nuclei (AGN) is still debated, even as evidence mounts that black hole growth in the absence of galaxy mergers cumulatively dominated and may substantially influence disc (i.e., merger-free) galaxy evolution. We investigate whether larg...

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Bibliographic Details
Published in:arXiv.org 2023-04
Main Authors: Garland, Izzy L, Fahey, Matthew J, Simmons, Brooke D, Smethurst, Rebecca J, Lintott, Chris J, Shanahan, Jesse, Silcock, Maddie S, Smith, Joshua, Keel, William C, Coil, Alison, Géron, Tobias, Kruk, Sandor, Masters, Karen L, O'Ryan, David, Thorne, Matthew R, Wiersema, Klaas
Format: Article
Language:English
Subjects:
Active galactic nuclei
Galactic evolution
Galaxy mergers & collisions
Hubble Space Telescope
Space telescopes
Star & galaxy formation
Star formation
Stars & galaxies
Stellar mass
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Summary:The role of large-scale bars in the fuelling of active galactic nuclei (AGN) is still debated, even as evidence mounts that black hole growth in the absence of galaxy mergers cumulatively dominated and may substantially influence disc (i.e., merger-free) galaxy evolution. We investigate whether large-scale galactic bars are a good candidate for merger-free AGN fuelling. Specifically, we combine slit spectroscopy and Hubble Space Telescope imagery to characterise star formation rates (SFRs) and stellar masses of the unambiguously disc-dominated host galaxies of a sample of luminous, Type-1 AGN with 0.02 < z 0.024. After carefully correcting for AGN signal, we find no clear difference in SFR between AGN hosts and a stellar mass-matched sample of galaxies lacking an AGN (0.013 < z < 0.19), although this could be due to a small sample size (n_AGN = 34). We correct for SFR and stellar mass to minimise selection biases, and compare the bar fraction in the two samples. We find that AGN are marginally (1.7\(\sigma\)) more likely to host a bar than inactive galaxies, with AGN hosts having a bar fraction, fbar = 0.59^{+0.08}_{-0.09} and inactive galaxies having a bar fraction fbar = 0.44^{+0.08}_{-0.09}. However, we find no further differences between SFR- and mass-matched AGN and inactive samples. While bars could potentially trigger AGN activity, they appear to have no further, unique effect on a galaxy's stellar mass or SFR.
ISSN:2331-8422
DOI:10.48550/arxiv.2304.01260