Deep optical imaging and spectroscopy of the lens system SDSS J1399+1310

作者：Shalyapin V N^*; Goicoechea L J

来源：Astronomy & Astrophysics, 2014, 568: A116.

DOI：10.1051/0004-6361/201323360

• gravitational lesning: strong
• gravitational lensing: micro
• galaxies: halos
• quasars: gerneral
• quasars: individual
• SDSSJ1339+1310

We present deep I-band imaging (NOT-ALFOSC) and spectroscopic (GTC-OSIRIS) observations of the gravitational lens system SDSS 31339+1310. This consists of two images of a lensed quasar. A and B, and a lensing galaxy G. between the two quasar images. Our observations led to the following main results: (1) We obtained new accurate positions for B and G (relative to A). as well as structure parameters for the light distribution of G. The new position angle for G. is separated by similar to 50 degrees from the previously determined value. (2) The spectrum of G is typical for early type galaxies, and we measured its redshift (0.609 +/- 0.001) for the first time. (3) We determined the flux ratio Bit for the cores of the emission lines in the two quasar spectra. They were used to constrain the macrolens flux ratio M-BA and dust extinction parameters. (4) The continuum flux ratio was appropriately corrected to obtain the microiensing magnification ratio of the continuum mu(BA). This mu(BA) indicates that B is amplified (relative to A) by a factor of about 3-5. with larger amplifications at shorter wavelengths. The observed inicrotensing chromaticity coincides with a sharp drop in the r-hand flux of B. (5) We reconstructed the lensing mass from the new observational constraints on the relative astrometry. M-BA and the luminous structure of G. We also used the redshift of G to predict the time delay between quasar images (43 +/- 5 d, A is leading).

• 出版日期2014-8