Tidal shells as clocks of galaxy mergers and tests of cosmological models
Abstract
Stellar shells-concentric arc-like tidal features formed in galaxy mergers-provide a valuable record of recent galaxy assembly histories encoding both the merger event and the gravitational potential of the host galaxy. We compare shell systems in observations and cosmological simulations from two complementary perspectives. First, we show that simulations predict a substantial population of very large (>100kpc) shells that are rarely observed, revealing a potentially important discrepancy between simulations and reality. Because the scales of observed and simulated shell systems differ significantly, we focus on a comparison of merger histories. Using a shell-identification method, we estimate merger times for a sample of nearby massive prolate rotators and compare them with merger histories derived from cosmological simulations. We also present ongoing efforts to expand the sample of deeply imaged prolate rotators using observations from the Milankovic telescope, paving the way for future studies based on larger observational samples.
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BibTeX
@misc{ebrova2026tidal,
title = {{Tidal shells as clocks of galaxy mergers and tests of cosmological models}},
author = {Ivana Ebrová and Michal Bílek and Elisabeth Sola and Pierre-Alain Duc and Ana Lalović},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38035},
eprint = {2610.38035},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38035},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Tidal shells as clocks of galaxy mergers and tests of cosmological models
AU - Ivana Ebrová
AU - Michal Bílek
AU - Elisabeth Sola
AU - Pierre-Alain Duc
AU - Ana Lalović
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.38035
UR - https://arxiv.org/abs/2610.38035
AB - Stellar shells-concentric arc-like tidal features formed in galaxy mergers-provide a valuable record of recent galaxy assembly histories encoding both the merger event and the gravitational potential of the host galaxy. We compare shell systems in observations and cosmological simulations from two complementary perspectives. First, we show that simulations predict a substantial population of very large (>100kpc) shells that are rarely observed, revealing a potentially important discrepancy between simulations and reality. Because the scales of observed and simulated shell systems differ significantly, we focus on a comparison of merger histories. Using a shell-identification method, we estimate merger times for a sample of nearby massive prolate rotators and compare them with merger histories derived from cosmological simulations. We also present ongoing efforts to expand the sample of deeply imaged prolate rotators using observations from the Milankovic telescope, paving the way for future studies based on larger observational samples.
ER -