Status: Bibliographieeintrag
Standort: ---
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| Online-Ressource |
Verfasst von: | Fedeli, Cosimo [VerfasserIn]  |
| Meneghetti, Massimo [VerfasserIn]  |
| Bartelmann, Matthias [VerfasserIn]  |
Titel: | A fast method for computing strong-lensing cross sections |
Titelzusatz: | application to merging clusters |
Verf.angabe: | Cosimo Fedeli, Massimo Meneghetti, Matthias Bartelmann, Klaus Dolag and Lauro Moscardini |
E-Jahr: | 2017 |
Jahr: | August 22, 2017 |
Umfang: | 10 S. |
Fussnoten: | Gesehen am 26.09.2017 |
Titel Quelle: | Enthalten in: De.arxiv.org |
Ort Quelle: | [S.l.] : Arxiv.org, 1991 |
Jahr Quelle: | 2017 |
Band/Heft Quelle: | (2017) Artikel-Nummer 1011.1559, 10 Seiten |
Abstract: | Strong gravitational lensing by irregular mass distributions, such as galaxy clusters, is generally not well quantified by cross sections of analytic mass models. Computationally expensive ray-tracing methods have so far been necessary for accurate cross-section calculations. We describe a fast, semi-analytic method here which is based on surface integrals over high-magnification regions in the lens plane and demonstrate that it yields reliable cross sections even for complex, asymmetric mass distributions. The method is faster than ray-tracing simulations by factors of $\sim30$ and thus suitable for large cosmological simulations, saving large amounts of computing time. We apply this method to a sample of galaxy cluster-sized dark matter haloes with simulated merger trees and show that cluster mergers approximately double the strong-lensing optical depth for lens redshifts $z_\mathrm{l}\gtrsim0.5$ and sources near $z_\mathrm{s} = 2$. We believe that this result hints at one possibility for understanding the recently detected high arcs abundance in clusters at moderate and high redshifts, and is thus worth further studies. |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Kostenfrei: Volltext: http://arxiv.org/abs/astro-ph/0507093 |
Datenträger: | Online-Ressource |
Sprache: | eng |
Sach-SW: | Astrophysics |
K10plus-PPN: | 1563803194 |
Verknüpfungen: | → Sammelwerk |
¬A¬ fast method for computing strong-lensing cross sections / Fedeli, Cosimo [VerfasserIn]; August 22, 2017 (Online-Ressource)
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