Parity dependence in strong lens systems as a probe of dark matter substructure

被引:12
作者
Chen, J. [1 ]
机构
[1] Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany
关键词
galaxies: halos; gravitational lensing; cosmology: dark matter; 4-IMAGE GRAVITATIONAL LENS; ALL-SKY SURVEY; MG 0414+0534; LAMBDA-CDM; HALOS; SATELLITES; RESOLUTION; PERTURBATIONS; MAGNIFICATION; SIMULATIONS;
D O I
10.1051/0004-6361/200811134
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The amount of mass in small, dark matter clumps within galaxies (substructure) is an important test of cold dark matter. One approach to measuring the substructure mass fraction is to analyze the fluxes of images that have been strongly lensed by a galaxy. Flux ratios between images that are anomalous with respect to smooth (no substructure) models have previously suggested that there is a greater amount of substructure than found in dark matter simulations. One measure of anomalous flux ratios is parity dependence - that the fluxes of different images of a source are perturbed differently. In this paper, we discuss parity dependence as a probe of dark matter substructure. We find that reproducing the observed parity dependence requires a significant alignment between concentrated dark matter clumps and images. The results may imply a greater fraction of mass in substructures than suggested by some dark matter simulations and that the observed parity dependence is unlikely to be reproduced by luminous satellites of lens galaxies.
引用
收藏
页码:49 / 60
页数:12
相关论文
共 34 条
[1]   Simulations of strong gravitational lensing with substructure [J].
Amara, A ;
Metcalf, RB ;
Cox, TJ ;
Ostriker, JP .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 367 (04) :1367-1378
[2]   The Cosmic Lens All-Sky Survey - II. Gravitational lens candidate selection and follow-up [J].
Browne, IWA ;
Wilkinson, PN ;
Jackson, NJF ;
Myers, ST ;
Fassnacht, CD ;
Koopmans, LVE ;
Marlow, DR ;
Norbury, M ;
Rusin, D ;
Sykes, CM ;
Biggs, AD ;
Blandford, RD ;
de Bruyn, AG ;
Chae, KH ;
Helbig, P ;
King, LJ ;
McKean, JP ;
Pearson, TJ ;
Phillips, PM ;
Readhead, ACS ;
Xanthopoulos, E ;
York, T .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 341 (01) :13-32
[3]   Lensing optical depths for substructure and isolated dark matter halos [J].
Chen, J ;
Kravtsov, AV ;
Keeton, CR .
ASTROPHYSICAL JOURNAL, 2003, 592 (01) :24-31
[4]   Astrometric perturbations in substructure lensing [J].
Chen, Jacqueline ;
Rozo, Eduardo ;
Dalal, Neal ;
Taylor, James E. .
ASTROPHYSICAL JOURNAL, 2007, 659 (01) :52-68
[5]   Direct detection of cold dark matter substructure [J].
Dalal, N ;
Kochanek, CS .
ASTROPHYSICAL JOURNAL, 2002, 572 (01) :25-33
[6]   B2045+265: A new four-image gravitational lens from CLASS [J].
Fassnacht, CD ;
Blandford, RD ;
Cohen, JG ;
Matthews, K ;
Pearson, TJ ;
Readhead, ACS ;
Womble, DS ;
Myers, ST ;
Browne, IWA ;
Jackson, NJ ;
Marlow, DR ;
Wilkinson, PN ;
Koopmans, LVE ;
de Bruyn, AG ;
Schilizzi, RT .
ASTRONOMICAL JOURNAL, 1999, 117 (02) :658-670
[7]   The subhalo populations of ΛCDM dark haloes [J].
Gao, L ;
White, SDM ;
Jenkins, A ;
Stoehr, F ;
Springel, V .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 355 (03) :819-834
[8]   Density profiles and substructure of dark matter halos: Converging results at ultra-high numerical resolution [J].
Ghigna, S ;
Moore, B ;
Governato, F ;
Lake, G ;
Quinn, T ;
Stadel, J .
ASTROPHYSICAL JOURNAL, 2000, 544 (02) :616-628
[9]   B0712+472: a new radio four-image gravitational lens [J].
Jackson, N ;
Nair, S ;
Browne, IWA ;
Wilkinson, PN ;
Muxlow, TWB ;
de Bruyn, AG ;
Koopmans, L ;
Bremer, M ;
Snellen, I ;
Miley, GK ;
Schilizzi, RT ;
Myers, S ;
Fassnacht, CD ;
Womble, DS ;
Readhead, ACS ;
Blandford, RD ;
Pearson, TJ .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 296 (03) :483-490
[10]   Multifrequency radio observations of the gravitational lens system MG 0414+0534 [J].
Katz, CA ;
Moore, CB ;
Hewitt, JN .
ASTROPHYSICAL JOURNAL, 1997, 475 (02) :512-518