The impact of baryonic cooling on giant arc abundances

Eduardo Rozo, Daisuke Nagai, Charles Keeton, Andrey Kravtsov

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Using ray tracing for simple analytic profiles, we demonstrate that the lensing cross section for producing giant arcs has distinct contributions due to arcs formed through image distortion only, and arcs form from the merging of two or three images. We investigate the dependence of each of these contributions on halo ellipticity and on the slope of the density profile, and demonstrate that at fixed Einstein radius, the lensing cross section increases as the halo profile becomes steeper. We then compare simulations with and without baryonic cooling of the same cluster for a sample of six clusters, and demonstrate that cooling can increase the overall abundance of giant arcs by factors of a few. The net boost to the lensing probability for individual clusters is mass dependent, and can lower the effective low-mass limit of lensing clusters. This last effect can potentially increase the number of lensing clusters by an extra 50%. While the magnitude of these effects may be overestimated due to the well-known overcooling problem in simulations, it is evident that baryonic cooling has a nonnegligible impact on the expected abundance of giant arcs, and hence cosmological constraints from giant arc abundances may be subject to large systematic errors.

Original languageEnglish (US)
Pages (from-to)22-38
Number of pages17
JournalAstrophysical Journal
Volume687
Issue number1
DOIs
StatePublished - Nov 1 2008
Externally publishedYes

Fingerprint

arcs
cooling
cross section
ray tracing
simulation
halos
profiles
cross sections
ellipticity
acceleration (physics)
systematic errors
slopes
radii
effect

Keywords

  • Cosmology: theory

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The impact of baryonic cooling on giant arc abundances. / Rozo, Eduardo; Nagai, Daisuke; Keeton, Charles; Kravtsov, Andrey.

In: Astrophysical Journal, Vol. 687, No. 1, 01.11.2008, p. 22-38.

Research output: Contribution to journalArticle

Rozo, E, Nagai, D, Keeton, C & Kravtsov, A 2008, 'The impact of baryonic cooling on giant arc abundances', Astrophysical Journal, vol. 687, no. 1, pp. 22-38. https://doi.org/10.1086/589955
Rozo, Eduardo ; Nagai, Daisuke ; Keeton, Charles ; Kravtsov, Andrey. / The impact of baryonic cooling on giant arc abundances. In: Astrophysical Journal. 2008 ; Vol. 687, No. 1. pp. 22-38.
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