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28 March 2024
 
  » arxiv » astro-ph/0508070

 Article overview


The Time Delays of Gravitational Lens HE0435-1223: An Early-Type Galaxy With a Rising Rotation Curve
C.S. Kochanek ; N.D. Morgan ; E.E. Falco ; B.A. McLeod ; J.N. Winn ; J. Dembicky ; B. Ketzeback ;
Date 2 Aug 2005
Subject astro-ph
Affiliation Department of Astronomy, The Ohio State University Harvard-Smithsonian Center for Astrophysics Apache Point Observatory
AbstractWe 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.
Source arXiv, astro-ph/0508070
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