期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 456, 期 1, 页码 870-884出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv2582
关键词
gravitational lensing: strong; galaxies: elliptical and lenticular, cD; galaxies: formation; galaxies: haloes; galaxies: structure
资金
- SNF [PP00P2_128540/1]
- European Seventh Framework Programme, Ideas [259349]
- Science and Technology Facilities Council [ST/M000990/1] Funding Source: researchfish
- STFC [ST/M000990/1, ST/K000977/1] Funding Source: UKRI
We measure the projected density profile, shape and alignment of the stellar and dark matter mass distribution in 11 strong-lens galaxies. We find that the projected dark matter density profile - under the assumption of a Chabrier stellar initial mass function - shows significant variation from galaxy to galaxy. Those with an outermost image beyond similar to 10 kpc are very well fit by a projected Navarro-Frenk-White (NFW) profile; those with images within 10 kpc appear to be more concentrated than NFW, as expected if their dark haloes contract due to baryonic cooling. We find that over several half-light radii, the dark matter haloes of these lenses are rounder than their stellar mass distributions. While the haloes are never more elliptical than e(dm) = 0.2, their stars can extend to e(*) > 0.2. Galaxies with high dark matter ellipticity and weak external shear show strong alignment between light and dark; those with strong shear (gamma greater than or similar to 0.1) can be highly misaligned. This is reassuring since isolated misaligned galaxies are expected to be unstable. Our results provide a new constraint on galaxy formation models. For a given cosmology, these must explain the origin of both very round dark matter haloes and misaligned strong-lens systems.
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