Strong lensing by cluster-sized haloes in dark-energy cosmologies

• Verfasst von: Meneghetti, Massimo [VerfasserIn]
• Verfasst von: Bartelmann, Matthias [VerfasserIn]
• Titel: Strong lensing by cluster-sized haloes in dark-energy cosmologies
• Verf.angabe: Massimo Meneghetti, Matthias Bartelmann, Klaus Dolag, Lauro Moscardini, Francesca Perrotta, Carlo Baccigalupi and Giuseppe Tormen
• 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 0405070, 10 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Astrophysics
• K10plus-PPN: 1563815184

Abstract

We study the efficiency of numerically simulated galaxy clusters for producing strong gravitational lensing events in different dark-energy cosmologies with constant and time-variable equation of state and we compare it with ``standard'' $\Lambda$CDM and OCDM models. Our main results are that: (1) the expected abundance of gravitational arcs with large length-to-width ratio depends on the equation of state of dark energy at the epoch of formation of the halo; (2) as found in previous studies, the strong lensing cross section of galaxy clusters is very sensitive to dynamical processes like mergers, whose impact however is different for different cosmologies, being stronger for models in which halos are less concentrated. As expected, the largest differences in the lensing optical depth occur at moderate and high redshift.