Journal Article

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

Stefan Hilbert, Simon D. M. White, Jan Hartlap and Peter Schneider

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 386, issue 4, pages 1845-1854
Published in print June 2008 | ISSN: 0035-8711
Published online April 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13190.x
Strong-lensing optical depths in a ΛCDM universe – II. The influence of the stellar mass in galaxies

Show Summary Details

Preview

We investigate how strong gravitational lensing in the concordance ΛCDM cosmology is affected by the stellar mass in galaxies. We extend our previous studies, based on ray tracing 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.

Keywords: gravitational lensing; methods: numerical; galaxies: general; cosmology: theory; dark matter; large-scale structure of Universe

Journal Article.  7777 words.  Illustrated.

Subjects: Astronomy and Astrophysics

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.