A time delay for the cluster-lensed quasar SDSS J1004+4112

J. Fohlmeister, C. S. Kochanek, E. E. Falco, J. Wambsganss, N. Morgan, C. W. Morgan, E. O. Üfek, D. Maoz, Charles Keeton, J. C. Barentine, G. Dalton, J. Dembicky, W. Ketzeback, R. McMillan, C. S. Peters

Research output: Contribution to journalArticle

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Abstract

We present 426 epochs of optical monitoring data spanning 1000 days from 2003 December to 2006 June for the gravitationally lensed quasar SDSS J1004+4112. The time delay between the A and B images is ΔtBA = 38.4 ± 2.0 days (Δχ2 = 4) in the expected sense that B leads A and the overall time ordering is C-B-A-D-E. The measured delay invalidates all published models. The models probably failed because they neglected the perturbations from cluster member galaxies. Models including the galaxies can fit the data well, but conclusions about the cluster mass distribution should await the measurement of the longer, and less substructure sensitive, delays of the C and D images. For these images, a delay of ΔtCB ≃ 681 ± 15 days is plausible but requires confirmation, while delays of ΔtCB 560 days and Δt AD > 800 days are required. We clearly detect microlensing of the A/B images, with the delay-corrected flux ratios changing from mB - mA -0-44 ± 0.01 mag in the first season to 0.29 ± 0.01 mag in the second season and 0.32 ± 0.01 mag in the third season.

Original languageEnglish (US)
Pages (from-to)62-71
Number of pages10
JournalAstrophysical Journal
Volume662
Issue number1 I
DOIs
StatePublished - Jun 10 2007

Fingerprint

quasars
time lag
galaxies
substructures
mass distribution
perturbation
time measurement

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmology: observations
  • Gravitational lensing

Cite this

Fohlmeister, J., Kochanek, C. S., Falco, E. E., Wambsganss, J., Morgan, N., Morgan, C. W., ... Peters, C. S. (2007). A time delay for the cluster-lensed quasar SDSS J1004+4112. Astrophysical Journal, 662(1 I), 62-71. https://doi.org/10.1086/518018
Fohlmeister, J. ; Kochanek, C. S. ; Falco, E. E. ; Wambsganss, J. ; Morgan, N. ; Morgan, C. W. ; Üfek, E. O. ; Maoz, D. ; Keeton, Charles ; Barentine, J. C. ; Dalton, G. ; Dembicky, J. ; Ketzeback, W. ; McMillan, R. ; Peters, C. S. / A time delay for the cluster-lensed quasar SDSS J1004+4112. In: Astrophysical Journal. 2007 ; Vol. 662, No. 1 I. pp. 62-71.
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Fohlmeister, J, Kochanek, CS, Falco, EE, Wambsganss, J, Morgan, N, Morgan, CW, Üfek, EO, Maoz, D, Keeton, C, Barentine, JC, Dalton, G, Dembicky, J, Ketzeback, W, McMillan, R & Peters, CS 2007, 'A time delay for the cluster-lensed quasar SDSS J1004+4112', Astrophysical Journal, vol. 662, no. 1 I, pp. 62-71. https://doi.org/10.1086/518018

A time delay for the cluster-lensed quasar SDSS J1004+4112. / Fohlmeister, J.; Kochanek, C. S.; Falco, E. E.; Wambsganss, J.; Morgan, N.; Morgan, C. W.; Üfek, E. O.; Maoz, D.; Keeton, Charles; Barentine, J. C.; Dalton, G.; Dembicky, J.; Ketzeback, W.; McMillan, R.; Peters, C. S.

In: Astrophysical Journal, Vol. 662, No. 1 I, 10.06.2007, p. 62-71.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A time delay for the cluster-lensed quasar SDSS J1004+4112

AU - Fohlmeister, J.

AU - Kochanek, C. S.

AU - Falco, E. E.

AU - Wambsganss, J.

AU - Morgan, N.

AU - Morgan, C. W.

AU - Üfek, E. O.

AU - Maoz, D.

AU - Keeton, Charles

AU - Barentine, J. C.

AU - Dalton, G.

AU - Dembicky, J.

AU - Ketzeback, W.

AU - McMillan, R.

AU - Peters, C. S.

PY - 2007/6/10

Y1 - 2007/6/10

N2 - We present 426 epochs of optical monitoring data spanning 1000 days from 2003 December to 2006 June for the gravitationally lensed quasar SDSS J1004+4112. The time delay between the A and B images is ΔtBA = 38.4 ± 2.0 days (Δχ2 = 4) in the expected sense that B leads A and the overall time ordering is C-B-A-D-E. The measured delay invalidates all published models. The models probably failed because they neglected the perturbations from cluster member galaxies. Models including the galaxies can fit the data well, but conclusions about the cluster mass distribution should await the measurement of the longer, and less substructure sensitive, delays of the C and D images. For these images, a delay of ΔtCB ≃ 681 ± 15 days is plausible but requires confirmation, while delays of ΔtCB 560 days and Δt AD > 800 days are required. We clearly detect microlensing of the A/B images, with the delay-corrected flux ratios changing from mB - mA -0-44 ± 0.01 mag in the first season to 0.29 ± 0.01 mag in the second season and 0.32 ± 0.01 mag in the third season.

AB - We present 426 epochs of optical monitoring data spanning 1000 days from 2003 December to 2006 June for the gravitationally lensed quasar SDSS J1004+4112. The time delay between the A and B images is ΔtBA = 38.4 ± 2.0 days (Δχ2 = 4) in the expected sense that B leads A and the overall time ordering is C-B-A-D-E. The measured delay invalidates all published models. The models probably failed because they neglected the perturbations from cluster member galaxies. Models including the galaxies can fit the data well, but conclusions about the cluster mass distribution should await the measurement of the longer, and less substructure sensitive, delays of the C and D images. For these images, a delay of ΔtCB ≃ 681 ± 15 days is plausible but requires confirmation, while delays of ΔtCB 560 days and Δt AD > 800 days are required. We clearly detect microlensing of the A/B images, with the delay-corrected flux ratios changing from mB - mA -0-44 ± 0.01 mag in the first season to 0.29 ± 0.01 mag in the second season and 0.32 ± 0.01 mag in the third season.

KW - Cosmology: observations

KW - Gravitational lensing

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Fohlmeister J, Kochanek CS, Falco EE, Wambsganss J, Morgan N, Morgan CW et al. A time delay for the cluster-lensed quasar SDSS J1004+4112. Astrophysical Journal. 2007 Jun 10;662(1 I):62-71. https://doi.org/10.1086/518018