Title: Supermassive Black Hole Growth in Local Low-Mass Mergers

Katherine Carver, Ashlyn Wright
Mentor: Adi Foord, Physics

Come see Kat's oral presentation in RAC 050 | 11 – 11:15 a.m.

Most massive galaxies host a supermassive black hole (SMBH) at their centers, whose feedback and growth impact the galaxy’s evolution. Such periods of activity, observed as active galactic nuclei (AGN), are thought to arise when gas is efficiently funneled toward the galactic center, fueling black hole accretion and growth. Extensive studies of major mergers have suggested a link between merger activity and the incidence of AGN. However, the precise role mergers play in triggering AGN activity remains unclear. This uncertainty is greater in the low-mass galaxy regime, where observational challenges make it difficult to identify merging systems and assess their AGN activity. Understanding AGN activity in low-mass mergers is especially important, as these systems are far more common and represent fundamental building blocks in the overall process of galaxy formation.
We present an X-ray study based on new XMM-Newton observations of six nearby (0.015 < z < 0.021) dwarf–dwarf galaxy merger systems. Out of the twelve galaxies analyzed, six show X-ray detections. Notably, two of the mergers exhibit X-ray emission from both galaxies, suggesting possible dual AGN candidates. These findings suggest that low-mass merging systems may significantly contribute to SMBH growth, playing a role comparable to that of major mergers.

This work was funded, in part, through an Undergraduate Research Award from the UMBC Division of Undergraduate Academic Affairs.

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