Microlensing Analysis for the Gravitational Lens Systems SDSS0924+0219, Q1355-2257, and SDSS1029+2623

K. Rojas, V. Motta, E. Mediavilla, J. Jiménez-Vicente, E. Falco, C. Fian

Research output: Contribution to journalArticlepeer-review


We use spectroscopic observations of the gravitationally lensed systems SDSS0924+0219(BC), Q1355-2257(AB), and SDSS1029+2623(BC) to analyze microlensing and dust extinction in the observed components. We detect chromatic microlensing effects in the continuum and microlensing in the broad emission line profiles of the systems SDSS0924+0219(BC) and Q1355-2257(AB). Using magnification maps to simulate microlensing and modeling the emitting region as a Gaussian intensity profile with size r s ∝ λ p, we obtain the probability density functions for a logarithmic size prior to. In the case of SDSS0924+0219, we obtain lt-d (at 1σ), which is larger than the range of other estimates, and p = 0.8 0.2 (at 1σ), which is smaller than predicted by the thin disk theory, but still in agreement with previous results. In the case of Q1355-2257 we obtain (at 1σ) lt-d, which is also larger than the theoretical prediction, and p = 2.0 0.7, which is in agreement with the theory within errors. SDSS1029+2326 spectra show evidence of extinction, probably produced by a galaxy in the vicinity of image C. Fitting an extinction curve to the data we estimate ΔE ∼ 0.2 in agreement with previous results. We found no evidence of microlensing for this system.

Original languageEnglish
Article number3
JournalAstrophysical Journal
Issue number1
StatePublished - 10 Feb 2020
Externally publishedYes


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