The time delays of gravitational lens HE 0435-1223: 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

Research output: Contribution to journalArticle

107 Scopus citations

Abstract

We present Hubble Space Telescope images and 2 years of optical photometry of the quadruple quasar HE 0435-1223. The time delays between the intrinsic quasar variations are Δ/AD = -14.37-0.85+0.75, ΔtAB = -8.00-0.82-0.73, and Δt AC = -2.10-0.71+0.78 days. We also observed nonintrinsic variations of ∼0.1 mag yr-1 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 (H0), we assume H0 = (72 ± 7) km s-1 Mpc-1 and derive constraints on the rotation curve. On the scale over which the lensed images occur (1″2 = 5 h-1 kpc ≃ 1.5Re), 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 earlytype galaxies are heterogeneous.

Original languageEnglish (US)
Pages (from-to)47-61
Number of pages15
JournalAstrophysical Journal
Volume640
Issue number1 I
DOIs
StatePublished - Mar 20 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmological parameters
  • Dark matter
  • Galaxies: kinematics and dynamics gravitational lensing
  • Quasars: individual (HE 0435-1223)

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    Kochanek, C. S., Morgan, N. D., Falco, E. E., Mcleod, B. A., Winn, J. N., Dembicky, J., & Ketzeback, B. (2006). The time delays of gravitational lens HE 0435-1223: An early-type galaxy with a rising rotation curve. Astrophysical Journal, 640(1 I), 47-61. https://doi.org/10.1086/499766