5 years ago

Dark matter self-interactions from the internal dynamics of dwarf spheroidals.

Hai-Bo Yu, Mauro Valli

Using the dataset of stellar kinematics for the brightest Milky Way dwarf spheroidal galaxies, we underpin the goodness of the self-interacting dark matter (SIDM) proposal as a solution to the "too-big-to-fail" problem through a detailed fit of the stellar velocity dispersion profiles. The kinematic data are consistent with SIDM if we allow for spatially varying stellar orbital anisotropies. We provide the first data-driven estimate for the SIDM cross-section per unit mass probed by these galaxies, pointing to $\sigma/m \sim$ 0.5 - 3 cm$^{2}$g$^{-1}$, in good agreement with recent estimates from the study of the dynamics in spiral galaxies. Our results well match the trends previously observed in pure SIDM N-body simulations. The analysis in this work outlines a complementary approach to simulations in testing SIDM with astrophysical observations.

Publisher URL: http://arxiv.org/abs/1711.03502

DOI: arXiv:1711.03502v1

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.