Strong Evolution in the Luminosity-Velocity Relation at z>1?

Abstract

We present a method for constraining the evolution of the galaxy luminosity-velocity (LV) relation in hierarchical scenarios of structure formation. The comoving number density of dark-matter halos with circular velocity of 200 km/s is predicted in favored CDM cosmologies to be nearly constant over the redshift range 0<z<5. Any observed evolution in the density of bright galaxies implies in turn a corresponding evolution in the LV relation. We consider several possible forms of evolution for the zero-point of the LV relation and predict the corresponding evolution in galaxy number density. The Hubble Deep Field suggests a large deficit of bright (M_V < -19) galaxies at 1.4 < z < 2. If taken at face value, this implies a dimming of the LV zero-point by roughly 2 magnitudes. Deep, wide-field, near-IR selected surveys will provide more secure measurements to compare with our predictions.

4 pages, 2 figures. Submitted to ApJ Letters

References in corpus (4)

• Profiles of dark haloes: evolution, scatter, and environment
• The Velocity Function of Galaxies
• Measuring the Cosmic Equation of State with Counts of Galaxies
• High redshift evolution of optically and IR-selected galaxies: a comparison with CDM scenarios

Cited by in corpus (16)

• Constraining Galaxy Formation and Cosmology with the Conditional Luminosity Function of Galaxies
• Halo and Subhalo Demographics with Planck Cosmological Parameters: Bolshoi-Planck and MultiDark-Planck Simulations
• Optical Selection of Galaxies at Redshifts 1<z<3
• Spectral Gamma-ray Signatures of Cosmological Dark Matter Annihilation
• On the Hot Gas Content of the Milky Way Halo
• The fundamental plane of EDisCS galaxies - The effect of size evolution
• The Impact of Cooling and Feedback on Disc Galaxies
• Measuring the Cosmic Equation of State with Counts of Galaxies II: Error Budget for the DEEP2 Redshift Survey
• The Role of Gas In Maintaining Quasi-Steady Spiral Structure In Stellar Disks
• Strong lensing constraints on the velocity dispersion and density profile of elliptical galaxies
• Constraints on the Inner Cluster Mass Profile and the Power Spectrum Normalization from Strong Lensing Statistics
• Schechter vs. Schechter: Sub-Arcsecond Gravitational Lensing and Inner Halo Profiles
• Multicolour Observations, Inhomogeneity & Evolution
• Quiescent Isolation: The Extremely Extended HI Halo of the Optically Compact Dwarf Galaxy ADBS 113845+2008
• The velocity function of dark matter halos at r=20 kpc: Remarkably little evolution since z ~ 4
• Past, present and Future of the Scaling Relations of Galaxies and Active Galactic Nuclei