The physical origins of low-mass spin bias

Beatriz Tucci, Antonio D. Montero-Dorta, L. Raul Abramo, Gabriela Sato-Polito, M. Celeste Artale

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


At z = 0, higher-spin haloes with masses above log(Mc/h -1M_) _ 11.5 have a higher bias than lower-spin haloes of the same mass. However, this trend is known to invert below this characteristic crossover mass, Mc. In this paper, we measure the redshift evolution and scale dependence of halo spin bias at the low-mass end and demonstrate that the inversion of the signal is entirely produced by the effect of splashback haloes. These low-mass haloes tend to live in the vicinity of significantly more massive haloes, thus sharing their large-scale bias properties.We further show that the location of the redshift-dependent crossover mass scale Mc(z) is completely determined by the relative abundance of splashbacks in the low- and high-spin subpopulations. Once splashback haloes are removed from the sample, the intrinsic mass dependence of spin bias is recovered. Since splashbacks have been shown to account for some of the assembly bias signal at the low-mass end, our results unveil a specific link between two different secondary bias trends: Spin bias and assembly bias.

Original languageEnglish
Pages (from-to)2777-2785
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 1 Jan 2021
Externally publishedYes


  • Cosmology: Theory
  • Dark matter
  • Galaxies: Haloes
  • Large-scale structure of Universe
  • Methods: numerical
  • Methods: Statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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