Microlensing of the broad emission line region in the quadruple lens SDSS J1004+4112

Gordon T. Richards; Charles R. Keeton; Bartosz Pindor; Joseph F. Hennawi; Patrick B. Hall; Edwin L. Turner; Naohisa Inada; Masamune Oguri; Shin Ichi Ichikawa; Robert H. Becker; Michael D. Gregg; Richard L. White; J. Stuart; Donald P. Schneider; David E. Johnston; Joshua A. Frieman; J. Brinkmann

doi:10.1086/421868

Microlensing of the broad emission line region in the quadruple lens SDSS J1004+4112

Gordon T. Richards, Charles R. Keeton, Bartosz Pindor, Joseph F. Hennawi, Patrick B. Hall, Edwin L. Turner, Naohisa Inada, Masamune Oguri, Shin Ichi Ichikawa, Robert H. Becker, Michael D. Gregg, Richard L. White, J. Stuart, Donald P. Schneider, David E. Johnston, Joshua A. Frieman, J. Brinkmann

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Abstract

We present seven epochs of spectroscopy on the quadruply imaged quasar SDSS J1004+4112, spanning observed-frame time delays from 1 to 322 days. The spectra reveal differences in the emission lines between the lensed images. Specifically, component A showed a strong enhancement in the blue wings of several high-ionization lines relative to component B, which lasted at least 28 days (observed frame) and then faded. Since the predicted time delay between A and B is ≳30 days, our time coverage suggests that the event was not intrinsic to the quasar. We attribute these variations to microlensing of part of the broad emission line region of the quasar, apparently resolving structure in the source plane on a scale of ∼10¹⁶ cm at z = 1.734. In addition, we observed smaller differences in the emission-line profiles between components A and B that persisted throughout the time span, which may also be due to microlensing or millilensing. Further spectroscopic monitoring of this system holds considerable promise for resolving the structure of the broad emission line region in quasars.

Original language	English (US)
Pages (from-to)	679-685
Number of pages	7
Journal	Astrophysical Journal
Volume	610
Issue number	2 I
DOIs	https://doi.org/10.1086/421868
State	Published - Aug 1 2004

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Richards, G. T., Keeton, C. R., Pindor, B., Hennawi, J. F., Hall, P. B., Turner, E. L., Inada, N., Oguri, M., Ichikawa, S. I., Becker, R. H., Gregg, M. D., White, R. L., Stuart, J., Schneider, D. P., Johnston, D. E., Frieman, J. A., & Brinkmann, J. (2004). Microlensing of the broad emission line region in the quadruple lens SDSS J1004+4112. Astrophysical Journal, 610(2 I), 679-685. https://doi.org/10.1086/421868

@article{49594593a4bd410f94fc1a0cdf35042f,

title = "Microlensing of the broad emission line region in the quadruple lens SDSS J1004+4112",

abstract = "We present seven epochs of spectroscopy on the quadruply imaged quasar SDSS J1004+4112, spanning observed-frame time delays from 1 to 322 days. The spectra reveal differences in the emission lines between the lensed images. Specifically, component A showed a strong enhancement in the blue wings of several high-ionization lines relative to component B, which lasted at least 28 days (observed frame) and then faded. Since the predicted time delay between A and B is ≳30 days, our time coverage suggests that the event was not intrinsic to the quasar. We attribute these variations to microlensing of part of the broad emission line region of the quasar, apparently resolving structure in the source plane on a scale of ∼1016 cm at z = 1.734. In addition, we observed smaller differences in the emission-line profiles between components A and B that persisted throughout the time span, which may also be due to microlensing or millilensing. Further spectroscopic monitoring of this system holds considerable promise for resolving the structure of the broad emission line region in quasars.",

author = "Richards, {Gordon T.} and Keeton, {Charles R.} and Bartosz Pindor and Hennawi, {Joseph F.} and Hall, {Patrick B.} and Turner, {Edwin L.} and Naohisa Inada and Masamune Oguri and Ichikawa, {Shin Ichi} and Becker, {Robert H.} and Gregg, {Michael D.} and White, {Richard L.} and J. Stuart and Schneider, {Donald P.} and Johnston, {David E.} and Frieman, {Joshua A.} and J. Brinkmann",

year = "2004",

month = aug,

day = "1",

doi = "10.1086/421868",

language = "English (US)",

volume = "610",

pages = "679--685",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2 I",

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Richards, GT, Keeton, CR, Pindor, B, Hennawi, JF, Hall, PB, Turner, EL, Inada, N, Oguri, M, Ichikawa, SI, Becker, RH, Gregg, MD, White, RL, Stuart, J, Schneider, DP, Johnston, DE, Frieman, JA & Brinkmann, J 2004, 'Microlensing of the broad emission line region in the quadruple lens SDSS J1004+4112', Astrophysical Journal, vol. 610, no. 2 I, pp. 679-685. https://doi.org/10.1086/421868

TY - JOUR

T1 - Microlensing of the broad emission line region in the quadruple lens SDSS J1004+4112

AU - Richards, Gordon T.

AU - Keeton, Charles R.

AU - Pindor, Bartosz

AU - Hennawi, Joseph F.

AU - Hall, Patrick B.

AU - Turner, Edwin L.

AU - Inada, Naohisa

AU - Oguri, Masamune

AU - Ichikawa, Shin Ichi

AU - Becker, Robert H.

AU - Gregg, Michael D.

AU - White, Richard L.

AU - Stuart, J.

AU - Schneider, Donald P.

AU - Johnston, David E.

AU - Frieman, Joshua A.

AU - Brinkmann, J.

PY - 2004/8/1

Y1 - 2004/8/1

N2 - We present seven epochs of spectroscopy on the quadruply imaged quasar SDSS J1004+4112, spanning observed-frame time delays from 1 to 322 days. The spectra reveal differences in the emission lines between the lensed images. Specifically, component A showed a strong enhancement in the blue wings of several high-ionization lines relative to component B, which lasted at least 28 days (observed frame) and then faded. Since the predicted time delay between A and B is ≳30 days, our time coverage suggests that the event was not intrinsic to the quasar. We attribute these variations to microlensing of part of the broad emission line region of the quasar, apparently resolving structure in the source plane on a scale of ∼1016 cm at z = 1.734. In addition, we observed smaller differences in the emission-line profiles between components A and B that persisted throughout the time span, which may also be due to microlensing or millilensing. Further spectroscopic monitoring of this system holds considerable promise for resolving the structure of the broad emission line region in quasars.

AB - We present seven epochs of spectroscopy on the quadruply imaged quasar SDSS J1004+4112, spanning observed-frame time delays from 1 to 322 days. The spectra reveal differences in the emission lines between the lensed images. Specifically, component A showed a strong enhancement in the blue wings of several high-ionization lines relative to component B, which lasted at least 28 days (observed frame) and then faded. Since the predicted time delay between A and B is ≳30 days, our time coverage suggests that the event was not intrinsic to the quasar. We attribute these variations to microlensing of part of the broad emission line region of the quasar, apparently resolving structure in the source plane on a scale of ∼1016 cm at z = 1.734. In addition, we observed smaller differences in the emission-line profiles between components A and B that persisted throughout the time span, which may also be due to microlensing or millilensing. Further spectroscopic monitoring of this system holds considerable promise for resolving the structure of the broad emission line region in quasars.

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JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 I

ER -

Microlensing of the broad emission line region in the quadruple lens SDSS J1004+4112

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