Stephanie O'Neil

Astrophysics Postdoc at University of Pennsylvania and Princeton

A listing of my papers is below and can also be found here.

First author papers

  1. S. O'Neil, J. Borrow, M. Vogelsberger, H. Zhao, B. Wang. How time weathers galaxies: The temporal impact of the cluster environment on galaxy formation and evolution. 2024, MNRAS, 530, 3, 3310-3326. [ads]
  2. S. O’Neil, M. Vogelsberger, S. Heeba, K. Schutz, J.C. Rose, P. Torrey, J. Borrow, R. Low, R. Adhikari, M.V. Medvedev, T.R. Slatyer, J. Zavala. Endothermic self-interacting dark matter in Milky Way-like haloes. 2023, MNRAS, 524, 1, 288-306 [ads]
  3. S. O’Neil, J. Borrow, M. Vogelsberger, B. Diemer. The impact of galaxy selection on the splashback boundaries of galaxy clusters. 2022, MNRAS, 513, 1, 835-852 [ads]
  4. S. O’Neil, D. J. Barnes, M. Vogelsberger, B. Diemer. The splashback boundary of haloes in hydrodynamic simulations. 2021, MNRAS, 504, 3, 4649-4666 [ads]

Student papers

  1. C. Hao, S. O'Neil, M. Vogelsberger, V. Tran, L. Mowla, J.S. Speagle. Finding the boundary: Using galaxy membership to inform galaxy cluster extent through machine learning. arXiv: 2511.07516, submitted to OJA. [ads]
  2. Q.S. Yu, S. O'Neil, X. Shen, M. Vogelsberger, S. Bose, B. Hadzhyska, L. Hernquist, R. Kannan, M. Wu, Z. Wu. Measuring the splashback feature: Dependence on halo properties and history. 2025, OJA, 8, 20pp. [ads]
  3. X. Sun, S. O'Neil, X. Shen, M. Vogelsberger. The effects of projection on measuring the splashback feature. 2025, OJA, 8, 8pp. [ads]
  4. V. Tran, D. Gilman, M. Vogelsberger, X. Shen, S. O'Neil, X. Zhang. Gravothermal Catastrope in Resonant Self-interacting Dark Matter Models. 2024, PRD, 110, 4, 12pp. [ads]
  5. A. Leonard, S. O’Neil, X. Shen, M. Vogelsberger, O. Rosenstein, H. Shangguan, Y. Teng, J. Hu. Varying primordial state fractions in exo- and endothermic SIDM simulations of Milky Way-mass haloes. 2024, MNRAS, 531, 1, 1440-1453. [ads]

Coauthor papers

  1. E. Lilie, J.C. Rose, M. Lisanti, A.M. Garcia, P. Torrey, K.E. Kollmann, J. Li, O. Mostow, B.Y. Want, S. O'Neil, X. Shen, A.M. Brooks, A. Farahi, N. Kallivayalil, L. Necib, A.B. Pace, M. Vogelsberger. The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Dark Matter Speed Distributions. arXiv: 2512.04157, submitted to ApJ. [ads]
  2. A.M. Garcia, J.C. Rose, P. Torrey, A. Caputo, M. Lisanti, A.B. Pace, H. Liu, A. Husseun, H. Liu, F. Villaescusa-Navarro, J. Barry, I. Leisher, B. Costanza, J. Kho, E. Lilie, J. Li, N. Ahvazi, A. Bhowmick, T. Nguyen, S. O'Neil, X. Ou, X. Shen, A. Farahi, N. Kallivayalil, L. Necib, M. Vogelsberger. The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Dark Matter Density Profiles. arXiv: 2512.03132, submitted to ApJ. [ads]
  3. J.C. Rose, M. Lisanti, P. Torrey, F. Villaescusa-Navarro, A.M. Garcia, A. Farahi, C. Filion, A.M. Brooks, Nitya, Kallivayalil, K.E. Kollmann, E. Lilie, J. Li, O. Mostow, A. Cruz, T. Nguyen, S. Roy, A.B. Pace, N. Ahvazi, S. O'Neil, X. Shen, F.-Y. Cyr-Racine, A.M. Price-Whelan, M. Geha, L. Necib, M. Vogelsberger, J.B. Muñoz, J.J. Dalcanton. The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Satellite Galaxies. arXiv: 2512.02095, submitted to ApJ. [ads]
  4. J.C. Rose, M. Lisanti, P. Torrey, F. Villaescusa-Navarro, A.M. Garcia, A. Farahi, C. Filion, A.M. Brooks, N. Kallivayalil, K.E. Kollmann, E. Lilie, B.Y. Wang, A. Cruz, S. Roy, A.B. Pace, N. Ahvazi, S. O'Neil, C. Roche, X. Shen, M. Vogelsberger. The DREAMS Project: A New Suite of 1,024 Simulations to Contextualize the Milky Way and Assess Physics Uncertainties. arXiv: 2512.00148, submitted to ApJ. [ads]
  5. I. Leisher, P. Torrey, A.M. Garcia, J.C. Rose, F. Villaescusa-Navarro, Z. Lubberts, A. Farahi, S. O'Neil, X. Shen, O. Mostow, N. Kallivayalil, D. Zimmerman, D. Narayanan, M. Vogelsberger. Linking Warm Dark Matter to Merger Tree Histories via Deep Learning Networks. arXiv: 2511.05367, submitted to ApJ. [ads]
  6. T.A. Gutcke, G. Despali, S. O'Neil, M. Vogelsberger, A. Fattahi, D.B. Sanders. Self-interacting dark matter in the center of a Local Group dwarf galaxy and its satellites. arXiv: 2510.05258, submitted to ApJ. [ads]
  7. W. Qin, K. Schutz, O. Rosenstein, S. O'Neil, M. Vogelsberger. Supersizing hydrodynamical simulations of reionization using perturbative techniques. arXiv: 2504.02929, submitted to PRD. [ads]
  8. V. Tran, X. Shen, D. Gilman, M. Vogelsberger, S. O'Neil, D. Xiong, J. Hu, Z. Wu. Core collapse in resonant self-interacting dark matter across two decades in halo masss. 2025, PRD, 112, 8. [ads]
  9. R. Low, R. Adhikari, J.C. Rose, S. O'Neil, M. Medvedev, P. Torrey, M. Vogelsberger. Structure Formation under Inelastic Two-Component Dark Matter: Halo Statistics and Matter Power Spectra in the High-z Universe. arXiv:2503.05881, submitted to MNRAS. [ads]
  10. V. Tran, X. Shen, M. Vogelsberger, D. Gilman, S. O'Neil, J. Gao. A Novel Density Profile for Isothermal Cores of Dark Matter Halos. arXiv:2411.11945, submitted to PRD. [ads]
  11. T. Nguyen, F. Villaescusa-Navarro, S. Mishra-Sharma, C. Cuesta-Lazaro, P. Torrey, A. Farahi, A.M. Garcia, J.C. Rose, S. O'Neil, M. Vogelsberger, X. Shen, C. Roche, D. Anglés-Alcázar, N. Kallivayalil, J.B. Muñoz, F.-Y. Cyr-Racine, S. Roy, L. Necib, K.E. Kollmann. How DREAMS are made: Emulating Satellite Galaxy and Subhalo Populations with Diffusion Models and Point Clouds. arXiv:2409.02980,submitted to ApJ. [ads]
  12. T.M. O'Shea, J. Borrow, S. O'Neil, M. Vogelsberger. Dynamical friction and measurements of the splashback radius in galaxy clusters. 2025, OJA, 8, 17pp. [ads]
  13. J.C. Rose, P. Torrey, F. Villaescusa-Navarro, M. Lisanti, T. Nguyen, S. Roy, K.E. Kollmann, M. Vogelsberger, F.-Y. Cyr-Racine, M.V. Medvedev, S. Genal, D. Anglés-Alcázar, N. Kallivayalil, B.Y. Wang, B. Costanza, S. O'Neil, C. Roche, S. Karmakar, A.M. Garcia, R. Low, S. Lin, O. Mostow, A. Cruz, A. Caputo, A. Farahi, J.B. Muñoz, L. Necib, R. Teyssier, J.J. Dalcanton, D. Spergel. Introducing the DREAMS Project: DaRk mattEr and Astrophysics with Machine learning and Simulations. 2025, ApJ, 982, 2, 68, 21pp. [ads]
  14. J.C. Rose, P. Torrey, F. Villaescusa-Navarro, M. Vogelsberger, S. O'Neil, M.V. Medvedev, R. Low, R. Adhikari, D. Anglés-Alázar. Inferring warm dark matter masses with deep learning. 2024, MNRAS, 527, 1, 739-755 [ads]
  15. J.C. Rose, P. Torrey, M. Vogelsberger, S. O’Neil. Unraveling the interplay between SIDM and baryons in MW halos: defining where baryons dictate heat transfer. 2023, MNRAS, 529, 5, 5623-5636 [ads]
  16. J. Borrow, M. Vogelsberger, S. O’Neil, M. McDonald, A. Smith. There and back again: understanding the critical properties of backsplash galaxies. 2023, MNRAS, 520, 1, 649-667 [ads]
  17. R. McKinnon, R. Kannan, M. Vogelsberger, S. O’Neil, P. Torrey, H. Li. Simulating dust grain-radiation coupling on a moving mesh. 2021, MNRAS, 502, 1, 1344-1354 [ads]
  18. M. Vogelsberger, R. McKinnon, S. O’Neil, F. Marinacci, P. Torrey, R. Kannan. Dust in and around galaxies: dust in cluster environments and its impact on cooling. 2019, MNRAS, 487, 4, 4870-4883 [ads]