28 citations · 56 across the 15 of their papers we have counts for
15 papers
Galaxy evolution in the post-merger regime. V - Atomic gas evolution traced by ALFALFA stacks
Sara L. Ellison, Manasvee Saraf, Leonardo Ferreira +4
(Abridged) In this work, we investigate the role of atomic hydrogen (HI) gas in the galaxy merger lifecycle. In order to both identify galaxies in mergers, as well as to predict th…
Merger Driven or Internal Evolution? A New Morphological Study of Tidal Disruption Event Host Galaxies
Janet N. Y. Chang, Connor Bottrell, Lixin Dai +7
The host galaxies of tidal disruption events (TDEs) show enhanced central stellar concentration and are preferentially found in poststarburst and green valley populations. This con…
Galaxy Mergers in UNIONS -- II: Predicting Timescales in the Post-Merger Regime
Leonardo Ferreira, Sara L. Ellison, David R. Patton +3
Galaxy mergers are critical events that influence galaxy evolution by driving processes such as enhanced star formation, quenching, and active galactic nucleus (AGN) activity. Howe…
Galaxy evolution in the post-merger regime. IV -- The long-term effect of mergers on galactic stellar mass growth and distribution
Sara L. Ellison, Leonardo Ferreira
Galaxy mergers are known to trigger bursts of central star formation, which should therefore lead to stellar mass growth in their inner regions. However, observational measurements…
Interacting galaxies in the IllustrisTNG simulations - IX: Mini mergers trigger AGN in cosmological simulations
Shoshannah Byrne-Mamahit, Sara L. Ellison, David R. Patton +3
Galaxy mergers are transformative events that can cause gaseous inflows capable of triggering active galactic nuclei (AGN). Previous studies of AGN in simulations have mainly focus…
UNIONS: The Ultraviolet Near-Infrared Optical Northern Survey
Stephen Gwyn, Alan W. McConnachie, Jean-Charles Cuillandre +86
The Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) is a "collaboration of collaborations" that is using the Canada-France-Hawai'i Telescope, the Pan-STARRS telescopes,…
Unions with UNIONS: Using galaxy-galaxy lensing to probe galaxy mergers
Isaac Cheng, Jack Elvin-Poole, Michael J. Hudson +12
We use galaxy-galaxy lensing to investigate how the dark matter (DM) haloes and stellar content of galaxies with and $10 \leq \log_{10}(M_\star/\mathrm{M}_…
Galaxy evolution in the post-merger regime. III -- The triggering of active galactic nuclei peaks immediately after coalescence
Sara L. Ellison, Leonardo Ferreira, Robert Bickley +6
Galaxy mergers have been shown to trigger AGN in the nearby universe, but the timescale over which this process happens remains unconstrained. The Multi-Model Merger Identifier (MU…
Galaxy evolution in the post-merger regime I -- Most merger-induced in-situ stellar mass growth happens post-coalescence
Leonardo Ferreira, Sara L. Ellison, David R. Patton +5
Galaxy mergers can enhance star formation rates throughout the merger sequence, with this effect peaking around the time of coalescence. However, owing to a lack of information abo…
Galaxy evolution in the post-merger regime. II -- Post-merger quenching peaks within 500 Myr of coalescence
Sara L. Ellison, Leonardo Ferreira, Vivienne Wild +3
(Abridged) Mechanisms for quenching star formation in galaxies remain hotly debated, with galaxy mergers an oft-proposed pathway. In Ellison et al. (2022) we tested this scenario b…
The effect of image quality on galaxy merger identification with deep learning
Robert W. Bickley, Scott Wilkinson, Leonardo Ferreira +3
Studies have shown that the morphologies of galaxies are substantially transformed following coalescence after a merger, but post-mergers are notoriously difficult to identify, esp…
Galaxy Mergers in UNIONS -- I: A Simulation-driven Hybrid Deep Learning Ensemble for Pure Galaxy Merger Classification
Leonardo Ferreira, Robert W. Bickley, Sara L. Ellison +7
Merging and interactions can radically transform galaxies. However, identifying these events based solely on structure is challenging as the status of observed mergers is not easil…
Interacting galaxies in the IllustrisTNG simulations -- VII: The connection between the most luminous active galactic nuclei and galaxy interactions
Shoshannah Byrne-Mamahit, David R. Patton, Sara L. Ellison +5
We investigate the connection between the most luminous active galactic nuclei (AGN), galaxy pairs, and post-mergers in the IllustrisTNG simulation. We select galaxy pairs and post…
The limitations (and potential) of non-parametric morphology statistics for post-merger identification
Scott Wilkinson, Sara L. Ellison, Connor Bottrell +4
Non-parametric morphology statistics have been used for decades to classify galaxies into morphological types and identify mergers in an automated way. In this work, we assess how…
X-ray AGNs with SRG/eROSITA: Multi-wavelength observations reveal merger triggering and post-coalescence circumnuclear blowout
Robert W. Bickley, Sara L. Ellison, Mara Salvato +6
Major mergers between galaxies are predicted to fuel their central supermassive black holes (SMBHs), particularly after coalescence. However, determining the prevalence of active g…