The dark matter content of lensing galaxies at 1.5 R_e
| dc.creator | Schechter, Paul L. | |
| dc.creator | Wambsganss, Joachim | |
| dc.date | 2003-09-05 | |
| dc.date.accessioned | 2026-07-07T02:09:26Z | |
| dc.date.available | 2026-07-07T02:09:26Z | |
| dc.description | Many gravitationally lensed quasars exhibit flux ratio "anomalies" that cannot be explained under the hypothesis that the lensing potential is smooth on scales smaller than one kpc. Micro-lensing by stars is a natural source of granularity in the lens potential. The character of the expected fluctuations due to micro-lensing depends sensitively on the relative surface densities of micro-lenses (stars) and smoothly distributed (dark) matter. Observations of flux ratios may therefore be used to infer the ratio of stellar to dark matter along the line of sight -- typically at impact parameters 1.5 times the half light radius. Several recently discovered systems have anomalies that would seem to be explained by micro-lensing only by demanding that 70-90% of the matter along the line of sight be smoothly distributed. | |
| dc.description | 6 pages, 3 figures, uses newpasp.sty. Contributed paper to be published in IAU Symposium No. 220: Dark Matter in Galaxies, eds. S. Ryder, D.J. Pisano, M. Walker, and K. Freeman | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0309163 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0309163 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/6433 | |
| dc.subject | Astrophysics | |
| dc.title | The dark matter content of lensing galaxies at 1.5 R_e | |
| dc.type | text |