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Stellar mass fraction and quasar accretion disk size in SDSS J1004+4112 from photometric follow-up

Published online by Cambridge University Press:  04 March 2024

R. Forés-Toribio Open the ORCID record for R. Forés-Toribio [Opens in a new window] ,
J. A. Muñoz Open the ORCID record for J. A. Muñoz [Opens in a new window] ,
C. Fian Open the ORCID record for C. Fian [Opens in a new window] ,
J. Jiménez-Vicente Open the ORCID record for J. Jiménez-Vicente [Opens in a new window]  and
E. Mediavilla Open the ORCID record for E. Mediavilla [Opens in a new window]
R. Forés-Toribio*
Affiliation:
Departamento de Astronoma y Astrofsica, Universidad de Valencia, E-46100 Burjassot, Valencia, Spain. Observatorio Astronómico, Universidad de Valencia, E-46980 Paterna, Valencia, Spain
J. A. Muñoz
Affiliation:
Departamento de Astronoma y Astrofsica, Universidad de Valencia, E-46100 Burjassot, Valencia, Spain. Observatorio Astronómico, Universidad de Valencia, E-46980 Paterna, Valencia, Spain
C. Fian
Affiliation:
Departamento de Astronoma y Astrofsica, Universidad de Valencia, E-46100 Burjassot, Valencia, Spain.
J. Jiménez-Vicente
Affiliation:
Departamento de Fsica Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva, 18071 Granada, Spain Instituto Carlos I de Fsica Teórica y Computacional, Universidad de Granada, 18071 Granada, Spain
E. Mediavilla
Affiliation:
Instituto de Astrofsica de Canarias, Va Láctea S/N, La Laguna, E-38200, Tenerife, Spain Departamento de Astrofsica, Universidad de la Laguna, La Laguna, E-38200, Tenerife, Spain
*
email: raquel.fores@uv.es
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Abstract

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The gravitational lens SDSS J1004+4112 was the first discovered system where a background quasar is lensed by a galaxy cluster instead of a single galaxy. We use the 14.5-year r-band light curves together with the recently measured time delay of the fourth brightest quasar image (Munõz et al. (2022)) and the mass model from Forés-Toribio et al. (2022) to study the microlensing effect in this system. We constrain the quasar accretion disk size to light-days at 2407Å in the restframe which is compatible with most previous estimates. We also infer the fraction of mass in stars at the positions of the quasar images: $${\alpha _A} = 0.058_{ - 0.032}^{ + 0.024},{\alpha _B} = 0.048_{ - 0.014}^{ + 0.032},{\alpha _C} = 0.018_{ - 0.018}^{ + 0.015}$$ and $${\alpha _D} = 0.008_{ - 0.008}^{ + 0.033}$$. The stellar fraction estimates are reasonable for intracluster medium although the stellar fractions at images A and B are slightly larger, suggesting the presence of a near undetected galaxy.

Keywords

Gravitational lensing: microGalaxies: clusters: intracluster mediumAccretionaccretion disksquasars: individual: SDSS J1004+4112
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S381: Strong Gravitational Lensing in the Era of Big Data , December 2022 , pp. 157 - 161
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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