The outer stellar mass of massive galaxies: a simple tracer of halo mass with scatter comparable to richness and reduced projection effects

Autor: Song Huang(黄崧), Alexie Leauthaud, Christopher Bradshaw, Andrew Hearin, Peter Behroozi, Johannes Lange, Jenny Greene, Joseph DeRose, Joshua S Speagle(沈佳士), Enia Xhakaj
Rok vydání: 2022
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society. 515:4722-4752
ISSN: 1365-2966
0035-8711
DOI: 10.1093/mnras/stac1680
Popis: Using the weak gravitational lensing data from the Hyper Suprime-Cam Subaru Strategic Program (HSC survey), we study the potential of different stellar mass estimates in tracing halo mass. We consider galaxies with $\log {M_{\star}/M_{\odot}}>11.5$ at 0.2 < z < 0.5 with carefully measured light profiles and clusters from the redMaPPer and CAMIRA richness-based algorithms. We devise a method (the "TopN" test) to evaluate the scatter in the halo mass-observable relation for different tracers and inter-compare halo mass proxies in four number density bins using stacked galaxy-galaxy lensing profiles. This test reveals three key findings. The stellar mass based on cModel photometry or aperture luminosity within R14.0$ and could be a better halo mass tracer at lower halo masses. Finally, using N-body simulations, we find that the lensing profiles of massive halos selected by M*[50,100] are consistent with the expectation for a sample without projection or mis-centering effects. On the other hand, Richness-selected clusters display an excess at R~1 Mpc in their lensing profiles, which may suggest a more significant impact from selection biases. These results suggest that Mstar-based tracers have distinct advantages in identifying massive halos, which could open up new avenues for cluster cosmology.
28 pages, 12 figures, 1 table, 7 appendices. Submitted to MNRAS. Codes available at https://github.com/dr-guangtou/jianbing Data available at https://doi.org/10.5281/zenodo.5259075
Databáze: OpenAIRE
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