We use MMT spectroscopy and deep Subaru Hyper Suprime-Cam (HSC) imaging to compare the spectroscopic central stellar velocity dispersion of quiescent galaxies with the effective dispersion of the dark matter halo derived from the stacked lensing signal. The spectroscopic survey (the Smithsonian Hectospec Lensing Survey) provides a sample of 4585 quiescent galaxy lenses with measured line-of-sight central stellar velocity dispersion ($$\sigma_{\rm SHELS}$$) that is more than 85\% complete for $R < 20.6$, $$D_{n}4000> 1.5$$ and $$M_{\star} > 10^{9.5}{\rm M}_{\odot}$$.The median redshift of the sample of lenses is 0.32. We measure the stacked lensing signal from the HSC deep imaging. The central stellar velocity dispersion is directly proportional to the velocity dispersion derived from the lensing $$\sigma_{\rm Lens}$$, $$\sigma_{\rm Lens} = (1.05\pm0.15)\sigma_{\rm SHELS}+(-21.17\pm35.19)$$. The independent spectroscopic and weak lensing velocity dispersions probe different scales, $$\sim3$$kpc and $$\gtrsim$$ 100 kpc, respectively, and strongly indicate that the observable central stellar velocity dispersion for quiescent galaxies is a good proxy for the velocity dispersion of the dark matter halo. We thus demonstrate the power of combining high-quality imaging and spectroscopy to shed light on the connection between galaxies and their dark matter halos.
Utsumi, Yousuke, et al. "Velocity Dispersions of Massive Quiescent Galaxies from Weak Lensing and Spectroscopy." The Astrophysical Journal (Online), vol. 900, no. 1, Aug. 2020. https://doi.org/10.3847/1538-4357/aba61c
Utsumi, Yousuke, Geller, Margaret J., Zahid, Harus J., et al., "Velocity Dispersions of Massive Quiescent Galaxies from Weak Lensing and Spectroscopy," The Astrophysical Journal (Online) 900, no. 1 (2020), https://doi.org/10.3847/1538-4357/aba61c
@article{osti_1657233,
author = {Utsumi, Yousuke and Geller, Margaret J. and Zahid, Harus J. and Sohn, Jubee and Dell'Antonio, Ian P. and Kawanomoto, Satoshi and Koshida, Shintaro and Miyazaki, Satoshi},
title = {Velocity Dispersions of Massive Quiescent Galaxies from Weak Lensing and Spectroscopy},
annote = {We use MMT spectroscopy and deep Subaru Hyper Suprime-Cam (HSC) imaging to compare the spectroscopic central stellar velocity dispersion of quiescent galaxies with the effective dispersion of the dark matter halo derived from the stacked lensing signal. The spectroscopic survey (the Smithsonian Hectospec Lensing Survey) provides a sample of 4585 quiescent galaxy lenses with measured line-of-sight central stellar velocity dispersion ($\sigma_{\rm SHELS}$) that is more than 85\% complete for $R 1.5$ and $M_{\star} > 10^{9.5}{\rm M}_{\odot}$.The median redshift of the sample of lenses is 0.32. We measure the stacked lensing signal from the HSC deep imaging. The central stellar velocity dispersion is directly proportional to the velocity dispersion derived from the lensing $\sigma_{\rm Lens}$, $\sigma_{\rm Lens} = (1.05\pm0.15)\sigma_{\rm SHELS}+(-21.17\pm35.19)$. The independent spectroscopic and weak lensing velocity dispersions probe different scales, $\sim3$kpc and $\gtrsim$ 100 kpc, respectively, and strongly indicate that the observable central stellar velocity dispersion for quiescent galaxies is a good proxy for the velocity dispersion of the dark matter halo. We thus demonstrate the power of combining high-quality imaging and spectroscopy to shed light on the connection between galaxies and their dark matter halos.},
doi = {10.3847/1538-4357/aba61c},
url = {https://www.osti.gov/biblio/1657233},
journal = {The Astrophysical Journal (Online)},
issn = {ISSN 1538-4357},
number = {1},
volume = {900},
place = {United States},
publisher = {Institute of Physics (IOP)},
year = {2020},
month = {08}}
Kavli Institute for Particle Astrophysics and Cosmology at SLAC
Sponsoring Organization:
USDOE Office of Science (SC); Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT); Alfred P. Sloan Foundation; National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1657233
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 900; ISSN 1538-4357