Self-Similar Models for the Mass Profiles of Early-type Lens Galaxies
| dc.creator | Rusin, D. | |
| dc.creator | Kochanek, C. S. | |
| dc.creator | Keeton, C. R. | |
| dc.date | 2003-06-05 | |
| dc.date.accessioned | 2026-07-07T10:26:58Z | |
| dc.date.available | 2026-07-07T10:26:58Z | |
| dc.description | We introduce a self-similar mass model for early-type galaxies, and constrain it using the aperture mass-radius relations determined from the geometries of 22 gravitational lenses. The model consists of two components: a concentrated component which traces the light distribution, and a more extended power-law component (rho propto r^-n) which represents the dark matter. We find that lens galaxies have total mass profiles which are nearly isothermal, or slightly steeper, on the several-kiloparsec radial scale spanned by the lensed images. In the limit of a single-component, power-law radial profile, the model implies n=2.07+/-0.13, consistent with isothermal (n=2). Models in which mass traces light are excluded at >99 percent confidence. An n=1 cusp (such as the Navarro-Frenk-White profile) requires a projected dark matter mass fraction of f_cdm = 0.22+/-0.10 inside 2 effective radii. These are the best statistical constraints yet obtained on the mass profiles of lenses, and provide clear evidence for a small but non-zero dark matter mass fraction in the inner regions of early-type galaxies. In addition, we derive the first strong lensing constraint on the relation between stellar mass-to-light ratio (Upsilon) and galaxy luminosity (L): Upsilon propto L^[0.14 (+0.16)(-0.12)], which is consistent with the relation suggested by the fundamental plane. Finally, we apply our self-similar mass models to current problems regarding the interpretation of time delays and flux ratio anomalies in gravitational lens systems. | |
| dc.description | 30 pages including 6 figures, to be published in ApJ | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0306096 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0306096 | |
| dc.identifier | Astrophys.J.595:29-42,2003 | |
| dc.identifier | doi:10.1086/377356 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177023 | |
| dc.subject | Astrophysics | |
| dc.title | Self-Similar Models for the Mass Profiles of Early-type Lens Galaxies | |
| dc.type | text |