Mid-IR Observations and a Revised Time Delay for the Gravitational Lens System Quasar HE 1104-1805

Details Mid-IR Observations and a Revised Time Delay for the Gravitational Lens System Quasar HE 1104-1805 Mid-IR Observations and a Revised Time Delay for the Gravitational Lens System Quasar HE 1104-1805

2006-12-04

arxiv.org/abs/astro-ph/0612045v2

Erratum-ibid.667:644,2007; Astrophys.J.660:146-151,2007

Astronomy and Astrophysics

Astrophysics

26 page, 6 figures; this version corrects table 1 which reported incorrect IRAC magnitudes; this change does not affect any re

Scientific paper

10.1086/520506 10.1086/512773

The mid-IR flux ratios F_A/F_B = 2.84 +/- 0.06 of the two images of the gravitationally lensed quasar HE 1104-1805 show no wavelength dependence to within 3% across 3.6-8.0 um, no time dependence over 6 months and agree with the broad emission line flux ratios. This indicates that the mid-IR emission likely comes from scales large enough to be little affected by microlensing and that there is little differential extinction between the images. We measure a revised time-delay between these two images of 152.2 +2.8-3.0 days from R and V-band data covering 1997 to 2006. This time-delay indicates that the lens has an approximately flat rotation curve over scales of 1-2 R_e. We also observed uncorrelated variations of ~0.05 mag/yr which we attribute to microlensing of the optical emission from the accretion disk. The optical colors have also changed significantly in the sense that image A is now redder than image B, rather than bluer as it was in 1993.

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