Query : 2014ApJ...797...61R

2014ApJ...797...61R - Astrophys. J., 797, 61 (2014/December-2)

Strong chromatic microlensing in HE0047-1756 and SDSS1155+6346.


Abstract (from CDS):

We use spectra of the double-lensed quasars HE0047-1756 and SDSS1155+6346 to study their unresolved structure through the impact of microlensing. There is no significant evidence of microlensing in the emission line profiles except for the Lyα line of SDSS1155+6346, which shows strong differences in the shapes for images A and B. However, the continuum of the B image spectrum in SDSS1155+6346 is strongly contaminated by the lens galaxy, and these differences should be considered with caution. Using the flux ratios of the emission lines for image pairs as a baseline to remove macro-magnification and extinction, we have detected strong chromatic microlensing in the continuum measured by CASTLES (www.cfa.harvard.edu/castles/) in both lens systems, with amplitudes 0.09(λ16000) ≲ |Δm| ≲ 0.8(λ5439) for HE0047-1756, and 0.2(λ16000) ≲ |Δm| ≲ 0.8(λ5439) for SDSS1155+6346. Using magnification maps to simulate microlensing and modeling the accretion disk as a Gaussian source (I ∝ exp(-R2/2rs2)) of size rs∝ λ^ p ^, we find rs= 2.5_-1.4+3.0 sqrt(M/0.3M) lt-day and p = 2.3±0.8 at the rest frame for λ = 2045 for HE0047-1756 (log prior) and rs= 5.5–3.38.2 sqrt(M/0.3M) lt-day and p = 1.5±0.6 at the rest frame of λ = 1398 for SDSS1155+6346 (log prior). Contrary to other studied lens systems, the chromaticity detected in HE0047-1756 and SDSS1155+6346 is large enough to fulfill the thin disk prediction. The inferred sizes, however, are very large compared to the predictions of this model, especially in the case of SDSS1155+6346.

Abstract Copyright:

Journal keyword(s): gravitational lensing: micro - gravitational lensing: strong - quasars: individual: (HE0047-1756, SDSS1155+6346)

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 [VV2006] J005027.8-174009 QSO 00 50 27.8233602592 -17 40 09.171002680           ~ 42 1
2 [PEI2004] SDSS J1155+6346 gLS 11 55 17.3 +63 46 22           ~ 11 0

    Equat.    Gal    SGal    Ecl

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