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

By C. Kochanek, N. Morgan, Emilio E. Falco, B. McLeod, J. Winn, J. Dembicky, B. G. D. O. Astronomy, T. U. O. S. D. A. Observatory. 2005

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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 ΔtAD = -14.37, ΔtAB = -8.00, and ΔtAC = -2.10 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 early-type galaxies are heterogeneous.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/682676a882c44d996b9d39a1884c8ee61ca736e9

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Citations in the corpus

COSMOLOGY FROM GRAVITATIONAL LENS TIME DELAYS AND PLANCK DATA (2013, methodology): “Cored power-law model 12 based on monitorings of COSMOGRAIL (COSmological MOnitoring of GRAvItational Lenses; e.g., Courbin et al. 2011; Tewes et al. 2013a) and Kochanek et al. (2006) teams.”
Gravitational Lens Time Delays: A Statistical Assessment of Lens Model Dependences and Implications for the Global Hubble Constant (2006, methodology): “Motivated by this, time delays have been measured in more than 10 lensed quasar systems (see, e.g., Kochanek et al. 2006c).”
SIZES AND TEMPERATURE PROFILES OF QUASAR ACCRETION DISKS FROM CHROMATIC MICROLENSING (2010, methodology): “For HE 0435, RX J0911, PG 1115, RX J1131, and WFI J2033, we used, respectively, the time delays reported by Kochanek et al. (2006), Hjorth et al. (2002), Barkana (1997), Morgan et al. (2006), and Vuissoz et al. (2008).”
H0LiCOW – XIII. A 2.4 per cent measurement of H0 from lensed quasars: 5.3σ tension between early- and late-Universe probes (2019, background): “If the source is variable on short time-scales, it is possible to monitor the fluxes of the images and measure the time delay, tij, between them (e.g. Vanderriest et al. 1989; Schechter et al. 1997; Fassnacht et al. 1999, 2002; Kochanek et al. 2006; Courbin et al. 2011).”
TWO ACCURATE TIME-DELAY DISTANCES FROM STRONG LENSING: IMPLICATIONS FOR COSMOLOGY (2012, methodology): “…out by the COSMOGRAIL (COSmological MOnitoring of GRAvItational Lenses; e.g., Vuissoz et al. 2008; Courbin et al. 2011; Tewes et al. 2012b) and Kochanek et al. (2006) teams, it is now possible to take gravitational time-delay lens cosmography to the next level and achieve precision comparable…”