Статья

The Time Delays of Gravitational Lens HE 0435−1223: An Early‐Type Galaxy with a Rising Rotation Curve

C. S. KochanekDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210N. D. MorganDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210E. FalcoHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138B. A. McLeodHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Joshua N. WinnHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138J. DembickyB. Ketzeback

2006en

ABI

Аннотация

We present Hubble Space Telescope images and 2 years of optical photometry of the quadruple quasar HE0435-1223. The time delays between the intrinsic quasar variations are 14.4+/-0.8 (A-D), 8.0+/-0.8 (A-B) and 2.1+/-0.8 (A-C) days. We also observed non-intrinsic variations of ~0.1 mag/yr that we attribute to microlensing. Instead of the traditional approach of assuming a rotation curve for the lens galaxy and then deriving the Hubble constant (H_0), we assume H_0=(72+/-7) km/s/Mpc and derive constraints on the rotation curve. On the scale over which the lensed images occur (1.2"=5kpc/h=1.5R_e), the lens galaxy must have a rising rotation curve, and it cannot have a constant mass-to-light ratio. These results add to the evidence that the structures of early-type galaxies are heterogeneous.

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Идентификаторы

DOI: 10.1086/499766

Цитирования и источники

Цитирований: 4Использованных источников: 0

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