The velocity dispersion function of early-type galaxies and its redshift evolution: the newest results from lens redshift test

Abstract

The redshift distribution of galactic-scale lensing systems provides a laboratory to probe the velocity dispersion function (VDF) of early-type galaxies (ETGs) and measure the evolution of early-type galaxies at redshift z ~ 1. Through the statistical analysis of the currently largest sample of early-type galaxy gravitational lenses, we conclude that the VDF inferred solely from strong lensing systems is well consistent with the measurements of SDSS DR5 data in the local universe. In particular, our results strongly indicate a decline in the number density of lenses by a factor of two and a 20% increase in the characteristic velocity dispersion for the early-type galaxy population at z ~ 1. Such VDF evolution is in perfect agreement with the $\Lambda$CDM paradigm (i.e., the hierarchical build-up of mass structures over cosmic time) and different from "stellar mass-downsizing" evolutions obtained by many galaxy surveys. Meanwhile, we also quantitatively discuss the evolution of the VDF shape in a more complex evolution model, which reveals its strong correlation with that of the number density and velocity dispersion of early-type galaxies. Finally, we evaluate if future missions such as LSST can be sensitive enough to place the most stringent constraints on the redshift evolution of early-type galaxies, based on the redshift distribution of available gravitational lenses.

9 pages, 4 figures, accepted for publication in MNRAS

References in corpus (9)

• The Sloan Lens ACS Survey. V. The Full ACS Strong-Lens Sample
• The Galaxy Mass Function up to z=4 in the GOODS-MUSIC sample: into the epoch of formation of massive galaxies
• The Structure & Dynamics of Massive Early-type Galaxies: On Homology, Isothermality and Isotropy inside one Effective Radius
• The Sloan Lens ACS Survey. XIII. Discovery of 40 New Galaxy-Scale Strong Lenses
• The Sloan Lens ACS Survey. XII. Extending Strong Lensing to Lower Masses
• The BOSS Emission-Line Lens Survey. IV. : Smooth Lens Models for the BELLS GALLERY Sample
• How robust are the constraints on cosmology and galaxy evolution from the lens-redshift test?
• Cosmological Parameters from the SDSS DR5 Velocity Dispersion Function of Early-Type Galaxies through Radio-Selected Lens Statistics
• Measuring the viscosity of dark matter with strongly lensed gravitational waves

Cited by in corpus (5)

• The Gravitational-Wave Physics II: Progress
• Revisiting the Lensed Fraction of High-Redshift Quasars
• A Mock Catalog of Gravitationally Lensed Quasars for the LSST Survey
• Cosmological Parameter Estimation Using Current and Future Observations of Strong Gravitational Lensing
• The Velocity Dispersion Function for Massive Quiescent and Star-Forming Galaxies at 0.6 $<$ z $\le$ 1.0