Subhalo abundance matching using progenitor mass at varying redshift: Two modes of stellar mass growth imprinted into the Subaru HSC galaxy clustering

We propose a novel subhalo abundance matching (SHAM) model that uses the virial mass of the main progenitor of each (sub)halo \(M_{\rm prog}\) as a proxy of the galaxy stellar mass \(M_*\) at the time of observation. This \(M_{\rm prog}\) model predicts the two-point correlation functions depending...

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Veröffentlicht in:arXiv.org 2023-06
Hauptverfasser: Masaki, Shogo, Kashino, Daichi, Ishikawa, Shogo, Yen-Ting, Lin
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Sprache:eng
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Zusammenfassung:We propose a novel subhalo abundance matching (SHAM) model that uses the virial mass of the main progenitor of each (sub)halo \(M_{\rm prog}\) as a proxy of the galaxy stellar mass \(M_*\) at the time of observation. This \(M_{\rm prog}\) model predicts the two-point correlation functions depending on the choice of the epoch \(z_{\rm prog}\) at which \(M_\mathrm{prog}\) is quoted. With \(z_{\rm prog}\) as a fitting parameter, we apply the \(M_{\rm prog}\) model to the angular correlation functions measured with varying stellar mass thresholds from \(M_{*,~{\rm lim}}/(h^{-2}M_\odot)=10^{11}\) to \(10^{8.6}\) using a sample of galaxies at \(z\simeq0.4\) from the Subaru Hyper Suprime-Cam survey. The \(M_{\rm prog}\) model can reproduce the observations very well over \(10~h^{-1}{\rm kpc}\textrm{--}10~h^{-1}{\rm Mpc}\). We find that, for the samples of \(10^{9.2}\leq M_{*,~{\rm lim}}/(h^{-2}M_\odot)\leq10^{10.2}\), the correlation functions predicted by the widely-used \(V_{\rm peak}\) model lack amplitudes at \(\lesssim1~h^{-1}{\rm Mpc}\), suggesting that \(M_{\rm prog}\) is a better proxy of the galaxy stellar mass than conventional \(V_{\rm peak}\). The \(z_{\rm prog}\) parameter is highest (\(z_{\rm prog}\simeq3\)) for intermediate mass galaxies at \(M_*\simeq10^{9.9}~h^{-2}M_\odot\), and becomes smaller down to \(z_\mathrm{prog}\simeq1\) for both lower- and higher-mass galaxies. We interpret these trends as reflecting the downsizing in the in-situ star formation in lower-mass galaxies and the larger contribution of the ex-situ stellar mass growth in higher-mass galaxies.
ISSN:2331-8422
DOI:10.48550/arxiv.2210.11713