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

doi:10.1086/499766

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

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131 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, Δt_AB = -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 ≃ 1.5R_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 earlytype galaxies are heterogeneous.

Original language	English (US)
Pages (from-to)	47-61
Number of pages	15
Journal	Astrophysical Journal
Volume	640
Issue number	1 I
DOIs	https://doi.org/10.1086/499766
State	Published - Mar 20 2006
Externally published	Yes

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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10.1086/499766

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title = "The time delays of gravitational lens HE 0435-1223: An early-type galaxy with a rising rotation curve",

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.",

keywords = "Cosmological parameters, Dark matter, Galaxies: kinematics and dynamics gravitational lensing, Quasars: individual (HE 0435-1223)",

author = "Kochanek, {C. S.} and Morgan, {N. D.} and Falco, {E. E.} and Mcleod, {B. A.} and Winn, {J. N.} and J. Dembicky and B. Ketzeback",

year = "2006",

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doi = "10.1086/499766",

language = "English (US)",

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T1 - The time delays of gravitational lens HE 0435-1223

T2 - An early-type galaxy with a rising rotation curve

AU - Kochanek, C. S.

AU - Morgan, N. D.

AU - Falco, E. E.

AU - Mcleod, B. A.

AU - Winn, J. N.

AU - Dembicky, J.

AU - Ketzeback, B.

PY - 2006/3/20

Y1 - 2006/3/20

N2 - 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.

AB - 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.

KW - Cosmological parameters

KW - Dark matter

KW - Galaxies: kinematics and dynamics gravitational lensing

KW - Quasars: individual (HE 0435-1223)

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The time delays of gravitational lens HE 0435-1223: An early-type galaxy with a rising rotation curve

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