Gravitational lens system SDSS J1339+1310: microlensing factory and time delay

Abstract

We spectroscopically re-observed the gravitational lens system SDSS J1339+1310 using OSIRIS on the GTC. We also monitored the $r$-band variability of the two quasar images (A and B) with the LT over 143 epochs in the period 2009$-$2016. These new data in both the wavelength and time domains have confirmed that the system is an unusual microlensing factory. The C$\mathrm{IV}$ emission line is remarkably microlensed, since the microlensing magnification of B relative to that for A, ${\mu }_{\mathrm{BA}}$, reaches a value of 1.4 ($\sim$ 0.4 mag) for its core. Moreover, the B image shows a red wing enhancement of C$\mathrm{IV}$ flux (relative to A), and ${\mu }_{\mathrm{BA}}$ = 2 (0.75 mag) for the C$\mathrm{IV}$ broad-line emission. Regarding the nuclear continuum, we find a chromatic behaviour of ${\mu }_{\mathrm{BA}}$, which roughly varies from $\sim$ 5 (1.75 mag) at 7000 Å to $\sim$ 6 (1.95 mag) at 4000 Å. We also detect significant microlensing variability in the $r$ band, and this includes a number of microlensing events on timescales of 50$-$100 d. Fortunately, the presence of an intrinsic 0.7 mag dip in the light curves of A and B, permitted us to measure the time delay between both quasar images. This delay is $\Delta t_{\mathrm{AB}}$ = 47${}_{-6}^{+5}$ d (1$\sigma$ confidence interval; A is leading), in good agreement with predictions of lens models.

Accepted to A&A; 19 pages, 2 appendices, 3 long tables (Tables 1-3). Tables 1-2 and an updated version of Table 3 are available at http://grupos.unican.es/glendama/q1339.htm

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