Strong lensing efficiency of galaxy clusters in dark energy cosmologies

被引:41
作者
Meneghetti, M
Bartelmann, M
Dolag, K
Moscardini, L
Perrotta, F
Baccigalupi, C
Tormen, G
机构
[1] Heidelberg Univ, Zentrum Astron, ITA, D-69120 Heidelberg, Germany
[2] Univ Padua, Dipartimento Astron, I-35120 Padua, Italy
[3] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
[4] SISSA, ISAS, I-34014 Trieste, Italy
[5] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy
[6] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[7] Max Planck Inst Teoret Astrophys, D-85748 Garching, Germany
关键词
gravitational lensing; cosmology : theory; galaxies : clusters : general;
D O I
10.1051/0004-6361:20041232
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the efficiency for producing strong gravitational lensing events of galaxy clusters numerically simulated in different dark-energy cosmologies with constant and time-variable equation of state, and we compare the results with those obtained in "standard" Delta CDM and OCDM models. Our main results are (1) that 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; and (2) that the high sensitivity of strong-lensing cross sections of galaxy clusters to dynamical processes like mergers, which was found in earlier studies, varies substantially between different cosmologies, being stronger for models in which halos are less concentrated. As expected, the largest differences in the lensing optical depth occur at intermediate and high redshift.
引用
收藏
页码:413 / 422
页数:10
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