Modelling anomalous lensed quasars

Nicholas Bate; Rachel Webster; Stuart Wyithe

doi:10.22323/1.054.0014

Modelling anomalous lensed quasars

Nicholas Bate
, Rachel Webster
, Stuart Wyithe

Research output: Contribution to journal › Conference article › peer-review

Abstract

Several gravitationally lensed quasars are observed with anomalous magnifications in pairs of images that straddle a critical curve. Simple theoretical arguments suggest that the magnification of these images should be approximately equivalent, whereas one image is observed to be significantly demagnified. Microlensing offers a possible explanation for this discrepancy. I will discuss the significance of the two key parameters in modelling this effect: the fraction of smooth matter in the lens at the image positions, and the size of the quasar emission region. We have applied our model to the anomalous lensed quasar MG 0414+0534, and found a 95 percent upper limit of 2.62 × 10¹⁶cm on the radius of the I-band emission region. The smooth matter percentage in this lens is unconstrained.

Original language	English
Article number	014
Number of pages	6
Journal	Proceedings of Science
Volume	54
Issue number	Session 2
DOIs	https://doi.org/10.22323/1.054.0014
Publication status	Published - 28 Aug 2008
Externally published	Yes
Event	Manchester Microlensing Conference, M2C: 12th International Conference on Gravitational Microlensing, and ANGLES Microlensing Workshop, GMC 2008 - Manchester, United Kingdom Duration: 21 Jan 2008 → 25 Jan 2008

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10.22323/1.054.0014

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title = "Modelling anomalous lensed quasars",

abstract = "Several gravitationally lensed quasars are observed with anomalous magnifications in pairs of images that straddle a critical curve. Simple theoretical arguments suggest that the magnification of these images should be approximately equivalent, whereas one image is observed to be significantly demagnified. Microlensing offers a possible explanation for this discrepancy. I will discuss the significance of the two key parameters in modelling this effect: the fraction of smooth matter in the lens at the image positions, and the size of the quasar emission region. We have applied our model to the anomalous lensed quasar MG 0414+0534, and found a 95 percent upper limit of 2.62 × 1016cm on the radius of the I-band emission region. The smooth matter percentage in this lens is unconstrained.",

author = "Nicholas Bate and Rachel Webster and Stuart Wyithe",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.; Manchester Microlensing Conference, M2C: 12th International Conference on Gravitational Microlensing, and ANGLES Microlensing Workshop, GMC 2008 ; Conference date: 21-01-2008 Through 25-01-2008",

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doi = "10.22323/1.054.0014",

language = "English",

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issn = "1824-8039",

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TY - JOUR

T1 - Modelling anomalous lensed quasars

AU - Bate, Nicholas

AU - Webster, Rachel

AU - Wyithe, Stuart

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

PY - 2008/8/28

Y1 - 2008/8/28

N2 - Several gravitationally lensed quasars are observed with anomalous magnifications in pairs of images that straddle a critical curve. Simple theoretical arguments suggest that the magnification of these images should be approximately equivalent, whereas one image is observed to be significantly demagnified. Microlensing offers a possible explanation for this discrepancy. I will discuss the significance of the two key parameters in modelling this effect: the fraction of smooth matter in the lens at the image positions, and the size of the quasar emission region. We have applied our model to the anomalous lensed quasar MG 0414+0534, and found a 95 percent upper limit of 2.62 × 1016cm on the radius of the I-band emission region. The smooth matter percentage in this lens is unconstrained.

AB - Several gravitationally lensed quasars are observed with anomalous magnifications in pairs of images that straddle a critical curve. Simple theoretical arguments suggest that the magnification of these images should be approximately equivalent, whereas one image is observed to be significantly demagnified. Microlensing offers a possible explanation for this discrepancy. I will discuss the significance of the two key parameters in modelling this effect: the fraction of smooth matter in the lens at the image positions, and the size of the quasar emission region. We have applied our model to the anomalous lensed quasar MG 0414+0534, and found a 95 percent upper limit of 2.62 × 1016cm on the radius of the I-band emission region. The smooth matter percentage in this lens is unconstrained.

UR - https://www.scopus.com/pages/publications/85055321976

U2 - 10.22323/1.054.0014

DO - 10.22323/1.054.0014

M3 - Conference article

AN - SCOPUS:85055321976

SN - 1824-8039

VL - 54

JO - Proceedings of Science

JF - Proceedings of Science

IS - Session 2

M1 - 014

T2 - Manchester Microlensing Conference, M2C: 12th International Conference on Gravitational Microlensing, and ANGLES Microlensing Workshop, GMC 2008

Y2 - 21 January 2008 through 25 January 2008

ER -

Modelling anomalous lensed quasars

Abstract

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