Stellar property statistics of massive haloes from cosmological hydrodynamics simulations

• Verfasst von: Anbajagane, Dhayaa [VerfasserIn]
• Verfasst von: Evrard, August E [VerfasserIn]
• Verfasst von: Farahi, Arya [VerfasserIn]
• Verfasst von: Barnes, David J [VerfasserIn]
• Verfasst von: Dolag, Klaus [VerfasserIn]
• Verfasst von: McCarthy, Ian G [VerfasserIn]
• Verfasst von: Nelson, Dylan [VerfasserIn]
• Verfasst von: Pillepich, Annalisa [VerfasserIn]
• Titel: Stellar property statistics of massive haloes from cosmological hydrodynamics simulations
• Titelzusatz: common kernel shapes
• Verf.angabe: Dhayaa Anbajagane, August E. Evrard, Arya Farahi, David J. Barnes, Klaus Dolag, Ian G. McCarthy, Dylan Nelson and Annalisa Pillepich
• E-Jahr: 2020
• Jahr: 2020 April 28
• Umfang: 19 S.
• Fussnoten: Gesehen am 29.07.2022
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2020
• Band/Heft Quelle: 495(2020), 1, Seite 686-704
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/staa1147
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 181099649X

Abstract

We study stellar property statistics, including satellite galaxy occupation, of haloes in three cosmological hydrodynamics simulations: BAHAMAS + MACSIS, IllustrisTNG, and Magneticum Pathfinder. Applying localized linear regression, we extract halo mass-conditioned normalizations, slopes, and intrinsic covariance for (i) Nsat, the number of stellar mass-thresholded satellite galaxies within radius R200c of the halo; (ii) $M_{\star , \rm tot}$, the total stellar mass within that radius, and (iii) $M_{\star ,\rm BCG}$, the gravitationally bound stellar mass of the central galaxy within a $100 \, \rm kpc$ radius. The parameters show differences across the simulations, in part from numerical resolution, but there is qualitative agreement for the $N_{\rm sat}\!-\! M_{\star ,\rm BCG}$ correlation. Marginalizing over Mhalo, we find the Nsat kernel, $p(\ln N_{\rm sat}\, |\, M_{\rm halo}, z)$ to be consistently skewed left in all three simulations, with skewness parameter γ = −0.91 ± 0.02, while the $M_{\star , \rm tot}$ kernel shape is closer to lognormal. The highest resolution simulations find γ ≃ −0.8 for the z = 0 shape of the $M_{\star ,\rm BCG}$ kernel. We provide a Gaussian mixture fit to the low-redshift Nsat kernel as well as local linear regression parameters tabulated for $M_{\rm halo}\gt 10^{13.5} \, {\rm M}_\odot$ in all simulations.