Strong-lensing optical depths in a ΛCDM universe – II. The influence of the stellar mass in galaxies

By Stefan Hilbert, Simon D. M. White, J. Hartlap, P. Schneider. 2007

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We investigate how strong gravitational lensing in the concordanceCDM cosmology is affected by the stellar mass in galaxies. We extend our previous studies, based on ray trac- ing through the Millennium Simulation, by including the stellar components predicted by galaxy formation models. We find that the inclusion of these components greatly enhances the probability for strong lensing compared to a 'dark matter only' universe. The identification of the 'lenses' associated with strong-lensing events reveals that the stellar mass of galaxies (i) significantly enhances the strong-lensing cross-sections of group and cluster haloes and (ii) gives rise to strong lensing in smaller haloes, which would not produce noticeable effects in the absence of the stars. Even if we consider only image splittings � 10 arcsec, the luminous matter can enhance the strong-lensing optical depths by up to a factor of 2.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/3134a1112f4f0d23af584c05246fa7e2c4489461

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Citations in the corpus

H0LiCOW - V. New COSMOGRAIL time delays of HE 0435-1223: H0 to 3.8 per cent precision from strong lensing in a flat ΛCDM model (2016, methodology): “…the lens environment (e.g. Fassnacht et al. 2006; Wong et al. 2011), comparisons between galaxy number counts in the real data and in simulations (Hilbert et al. 2007, 2009; Fassnacht et al. 2011; Collett et al. 2013; Greene et al. 2013; Suyu et al. 2013; McCully et al. 2016) or using…”
DISSECTING THE GRAVITATIONAL LENS B1608+656. II. PRECISION MEASUREMENTS OF THE HUBBLE CONSTANT, SPATIAL CURVATURE, AND THE DARK ENERGY EQUATION OF STATE (2009, methodology): “The methods for sampling lines of sight, identifying strong lensing events, and calculating the convergence are described in Hilbert et al. (2007).”
H0LiCOW – I. H0 Lenses in COSMOGRAIL's wellspring: program overview (2016, background): “…of local galaxy groups and line-of-sight structures (e.g., Momcheva et al. 2006; Fassnacht et al. 2006; Momcheva et al. 2015) in combination with ray-tracing through numerical N-body simulations (e.g., Hilbert et al. 2007, 2009; Suyu et al. 2010; Greene et al. 2013; Collett et al. 2013).”
Combining Lens Distortion and Depletion to Map the Mass Distribution of A1689 (2007, background): “…of extended groups and filaments outside the virial radius of the cluster is of relatively low mass contrast compared to the projected mass due to the cluster itself, and therefore lensing based projected masses of clusters are not overestimated by more that a few percent (Hilbert et al. 2007).”
A COMPREHENSIVE ANALYSIS OF UNCERTAINTIES AFFECTING THE STELLAR MASS–HALO MASS RELATION FOR 0 < z < 4 (2010, background): “However, from ray-tracing studies of the Millennium simulation (Hilbert et al. 2007), the expectd scatter in galaxy stellar masses from lensing is minimal (e.g., 0.04 dex atz = 1) compared to the other sources of scatter above (e.g., 0.25 dex from different model choices).”
Ray-tracing through the Millennium Simulation: Born corrections and lens-lens coupling in cosmic shear and galaxy-galaxy lensing (2008, methodology): “A brief outline of our algorithms for the construction of the past light cones and the lens planes has been given in an earlier work (Hilbert et al. 2007b).”
TWO ACCURATE TIME-DELAY DISTANCES FROM STRONG LENSING: IMPLICATIONS FOR COSMOLOGY (2012, methodology): “We further calibrate observations of galaxy counts in the fields of lenses (Fassnacht et al. 2011) with ray tracing through numerical simulations of large-scale structure (e.g., Hilbert et al. 2007) to constrain directly and statistically κext at the ∼5% level (Suyu et al. 2010).”