Boundary-supported radial layering in Hoag-like ring galaxies

@misc{xu2026boundarysupported,
  title = {{Boundary-supported radial layering in Hoag-like ring galaxies}},
  author = {Yue Xu and Chenxi Sun and Jianwei Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2605.14725},
  eprint = {2605.14725},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.14725},
}

TY  - UNPB
TI  - Boundary-supported radial layering in Hoag-like ring galaxies
AU  - Yue Xu
AU  - Chenxi Sun
AU  - Jianwei Zhang
PY  - 2026
DA  - 2026/10/13
PB  - arXiv
DO  - 10.48550/arxiv.2605.14725
UR  - https://arxiv.org/abs/2605.14725
AB  - Clean Hoag-like ring galaxies are often characterized by an old compact central component, a depleted gap, and a detached outer ring. We identify a boundary-supported radial-layering mechanism in a shell-deformed Kepler control model. A compact inner boundary supplies the core state, while a localized effective shell deformation, interpreted as the reduced imprint of externally supplied material settled near a finite circularization radius, needs to create only an internal maximum and a subsequent outer minimum. These act as the gap barrier and ring-supporting well. The onset of this structure is organized by a saddle-node threshold of the critical-point equation. In a 10^4-point Monte Carlo scan, shell-localized boundary-supported candidates occupy finite parameter volume under the adopted priors, and none of the localized candidates contains an ordered interior minimum--maximum--minimum subsequence. The same branch gives a scale-free gap-to-ring interval overlapping representative ratios for Hoag's Object, UGC 4599, and PGC 1000714, but not for the environmentally processed comparison object JO171.
ER  -