The distinct stellar-to-halo mass relations of satellite and central galaxies

• Verfasst von: Engler, Christoph [VerfasserIn]
• Verfasst von: Pillepich, Annalisa [VerfasserIn]
• Verfasst von: Joshi, Gandhali D. [VerfasserIn]
• Verfasst von: Nelson, Dylan [VerfasserIn]
• Verfasst von: Pasquali, Anna [VerfasserIn]
• Verfasst von: Grebel, Eva K. [VerfasserIn]
• Verfasst von: Lisker, Thorsten [VerfasserIn]
• Verfasst von: Zinger, Elad [VerfasserIn]
• Verfasst von: Donnari, Martina [VerfasserIn]
• Verfasst von: Marinacci, Federico [VerfasserIn]
• Verfasst von: Vogelsberger, Mark [VerfasserIn]
• Verfasst von: Hernquist, Lars [VerfasserIn]
• Titel: The distinct stellar-to-halo mass relations of satellite and central galaxies
• Titelzusatz: insights from the IllustrisTNG simulations
• Verf.angabe: Christoph Engler, Annalisa Pillepich, Gandhali D Joshi, Dylan Nelson, Anna Pasquali, Eva K Grebel, Thorsten Lisker, Elad Zinger, Martina Donnari, Federico Marinacci, Mark Vogelsberger and Lars Hernquist
• Jahr: 2021
• Fussnoten: Gesehen am 18.04.2022
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2021
• Band/Heft Quelle: 500(2021), 3, Seite 3957-3975$p19
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/staa3505
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 179971098X

Abstract

We study the stellar-to-halo mass relation (SHMR) for central and satellite galaxies with total dynamical masses above $10^{10.5}\, \rm {M}_\odot$ using the suite of cosmological magnetohydrodynamical simulations IllustrisTNG. In particular, we quantify environmental effects on satellite populations from TNG50, TNG100, and TNG300 located within the virial radius of group- and cluster-like hosts with total masses of $10^{12\!-\!15.2}\, \rm {M}_\odot$. At fixed stellar mass, the satellite SHMR exhibits a distinct shift towards lower dynamical mass compared to the SHMR of centrals. Conversely, at fixed dynamical mass, satellite galaxies appear to have larger stellar-to-total mass fractions than centrals by up to a factor of a few. The systematic deviation from the central SHMR is larger for satellites in more massive hosts, at smaller cluster-centric distances, with earlier infall times, and that inhabits higher local density environments; moreover, it is in place already at early times (z ≲ 2). Systematic environmental effects might contribute to the perceived galaxy-to-galaxy variation in the measured SHMR when galaxies cannot be separated into satellites and centrals. The SHMR of satellites exhibits a larger scatter than centrals (by up to ∼0.8 dex), over the whole range of dynamical mass. The shift of the satellite SHMR results mostly from tidal stripping of their dark matter, which affects satellites in an outside-in fashion: The departure of the satellite SHMR from the centrals’ relation diminishes for measurements of dynamical mass in progressively smaller apertures. Finally, we provide a family of fitting functions for the SHMR predicted by IllustrisTNG.