The impact of the halo spin-concentration relation on disc scaling laws - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2020

The impact of the halo spin-concentration relation on disc scaling laws

Lorenzo Posti
Gabriele Pezzulli
Filippo Fraternali
Rodrigo Ibata
Antonino Marasco


Galaxy scaling laws, such as the Tully–Fisher, mass-size, and Fall relations, can provide extremely useful clues on our understanding of galaxy formation in a cosmological context. Some of these relations are extremely tight and well described by one single parameter (mass), despite the theoretical existence of secondary parameters such as spin and concentration, which are believed to impact these relations. In fact, the residuals of these scaling laws appear to be almost uncorrelated with each other, posing significant constraints on models where secondary parameters play an important role. Here, we show that a possible solution is that such secondary parameters are correlated amongst themselves, in a way that removes correlations in observable space. In particular, we focus on how the existence of an anti-correlation between the dark matter halo spin and its concentration, which is still debated in simulations, can weaken the correlation of the residuals of the Tully–Fisher and mass-size relations. Interestingly, in using simple analytic galaxy formation models, we find that this happens only for a relatively small portion of the parameter space that we explored, which suggests that this idea could be used to derive constraints on galaxy formation models that have yet to be explored.
Fichier principal
Vignette du fichier
aa38474-20.pdf (1.08 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-03037165 , version 1 (03-12-2020)



Lorenzo Posti, Benoit Famaey, Gabriele Pezzulli, Filippo Fraternali, Rodrigo Ibata, et al.. The impact of the halo spin-concentration relation on disc scaling laws. Astronomy and Astrophysics - A&A, 2020, 644, pp.A76. ⟨10.1051/0004-6361/202038474⟩. ⟨hal-03037165⟩
41 View
61 Download



Gmail Facebook Twitter LinkedIn More