Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-27
Astronomy and Astrophysics
Astrophysics
19 pages, including 5 figures, ApJ in press
Scientific paper
10.1086/324493
We investigate the effects of numerous dark matter subhalos in a galaxy-sized halo on the events of strong lensing, to assess their presence as expected from the cold dark matter scenario. Lens galaxies are represented by a smooth ellipsoid in an external shear field and additional cold dark matter subhalos taken from Monte Carlo realizations which accord with recent N-body results. We also consider other possible perturbers, globular clusters and luminous dwarf satellites, for comparison. We then apply the models to the particular lens systems with four images, B1422+231 and PG1115+080, for which smooth lens models are unable to reproduce both the positions of the images and their radio flux ratios or dust-free optical flux ratios simultaneously. We show that the perturbations by both globular clusters and dwarf satellites are too small to change the flux ratios, whereas cold dark matter subhalos are most likely perturbers to reproduce the observed flux ratios in a statistically significant manner. This result suggests us the presence of numerous subhalos in lens galaxies, which is consistent with the results of cosmological N-body simulations.
No associations
LandOfFree
Probing Dark Matter Substructure in Lens Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Probing Dark Matter Substructure in Lens Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Probing Dark Matter Substructure in Lens Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-513619