A critical assessment of solutions to the galaxy diversity problem

Zentner, Aidan; Dandavate, Siddharth; Slone, Oren; Lisanti, Mariangela

doi:10.1088/1475-7516/2022/07/031

A critical assessment of solutions to the galaxy diversity problem

Journal Article · Tue Jul 19 00:00:00 EDT 2022 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2022/07/031· OSTI ID:1979365

Zentner, Aidan ^[1]; Dandavate, Siddharth ^[2]; ^[3]; ^[4]

Princeton University, NJ (United States); Princeton Univ., NJ (United States)
Princeton University, NJ (United States)
Princeton University, NJ (United States); New York University (NYU), NY (United States)
Princeton University, NJ (United States); Flatiron Institute, New York, NY (United States)

Galactic rotation curves exhibit a diverse range of inner slopes. Observational data indicates that explaining this diversity may require a mechanism that correlates a galaxy's surface brightness with the central-most region of its dark matter halo. Here, in this work, we compare several concrete models that capture the relevant physics required to explain the galaxy diversity problem. We focus specifically on a Self-Interacting Dark Matter (SIDM) model with an isothermal core and two Cold Dark Matter (CDM) models with/without baryonic feedback. In contrast to the CDM case, the SIDM model can lead to the formation of an isothermal core in the halo, and is also mostly insensitive to baryonic feedback processes, which act on longer time-scales. Using rotation curves from 90 galaxies in the Spitzer Photometry & Accurate Rotation Curves (SPARC) catalog, we perform a comprehensive model comparison that addresses issues of statistical methodology from prior works. The best-fit halo models that we recover are consistent with standard CDM concentration-mass and abundance matching relations. We find that both the SIDM and feedback-affected CDM models are better than a CDM model with no feedback in explaining the rotation curves of low and high surface brightness galaxies in the sample. However, when compared to each other, there is no strong statistical preference for either the SIDM or the feedback-affected CDM halo model as the source of galaxy diversity in the SPARC catalog.

View Accepted Manuscript (DOE)

Research Organization:: Princeton University, NJ (United States)

Sponsoring Organization:: Binational Science Foundation; National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: SC0007968

OSTI ID:: 1979365

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 07 Vol. 2022; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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