J/A+A/596/A77 SDSS J1339+1310 spectra and light curves (Goicoechea+, 2016)
Gravitational lens system SDSS J1339+1310: microlensing factory and time delay.
Goicoechea L.J., Shalyapin V.N.
<Astron. Astrophys. 596, A77 (2016)>
=2016A&A...596A..77G 2016A&A...596A..77G (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; QSOs ; Spectroscopy ; Photometry
Keywords: gravitational lensing: strong - gravitational lensing: micro -
quasars: individual (SDSS J1339+1310) - cosmological parameters
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 CIV emission line is remarkably
microlensed, since the microlensing magnification of B relative to
that for A,µBA, reaches a value of 1.4 (∼0.4mag) for its core.
Moreover, the B image shows a red wing enhancement of CIV flux
(relative to A), and µBA=2 (0.75mag) for the CIV broad-line
emission. Regarding the nuclear continuum, we find a chromatic
behaviour of µBA, which roughly varies from ∼5 (1.75mag) at
7000Å to ∼6 (1.95mag) at 4000Å. We also detect significant
microlensing variability in the r band, and this includes a number of
microlensing events on timescales of 50-100d. 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 ΔtAB=47+5-6d (1σ confidence interval;
A is leading), in good agreement with predictions of lens models.
Description:
We carried out long-slit spectroscopy of the lens system
SDSS J1339+1310 (Inada et al., 2009AJ....137.4118I 2009AJ....137.4118I) in 2014 using the
OSIRIS instrument on the 10.4m Gran Telescopio Canarias (GTC). We then
extracted the optical spectra of the two quasar images (A and B) and
the main lensing galaxy (G) on 27 March 2014 (R500R grism; Table 1)
and 20 May 2014 (R500B grism; Table 2), i.e., at two epochs separated
by approximately the time delay of the system. Previous GTC spectra
(13 April 2013) were presented in Shalyapin et al.
(2014A&A...568A.116S 2014A&A...568A.116S, Cat. J/A+A/586/A116). In addition, we conducted
a monitoring campaign in 2009, 2012-2015 and early 2016 with the 2.0m
Liverpool Telescope in the SDSS-r passband. This allowed us to
construct an optical variability database of the two images of the
gravitationally lensed quasar (Table 3). While Table 3 contains r-band
magnitudes for 143 observation nights, an extended (updated) version
is also available at the Glendama website
(http://grupos.unican.es/glendama/q1339.htm)
Objects:
-------------------------------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------------------------
13 39 07.14 +13 10 39.7 SDSS J1339+1310 = [IOS2009] SDSS J1339+1310
-------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 28 916 Red grism spectra (485.0-925.7nm)
table2.dat 28 979 Blue grism spectra (360.1-720.2nm)
table3.dat 47 143 Light curves in the r band (622.5nm)
--------------------------------------------------------------------------------
See also:
J/A+A/586/A116 : HD50138 time-dependent spectral variations (Jerabkova+, 2016)
http://grupos.unican.es/glendama/ : Glendama website
Byte-by-byte Description of file: table1.dat table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 0.1nm lambda Observed wavelength in Angstroms
10- 15 F6.3 0.1nW/m3 FA Flux of SDSS J1339+1310A
17- 22 F6.3 0.1nW/m3 FB Flux of SDSS J1339+1310B
24- 28 F5.3 0.1nW/m3 FG Flux of SDSS J1339+1310G
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 d MJD Modified Julian Date (MJD-50000)
10- 15 F6.3 mag rmagA r magnitude of SDSS J1339+1310A
17- 21 F5.3 mag e_rmagA Error in r magnitude of SDSS J1339+1310A
23- 28 F6.3 mag rmagB r magnitude of SDSS J1339+1310B
30- 34 F5.3 mag e_rmagB Error in r magnitude of SDSS J1339+1310B
36- 41 F6.3 mag rmagS r magnitude of the control star S
43- 47 F5.3 mag e_rmagS Error in r magnitude of S
--------------------------------------------------------------------------------
Acknowledgements:
Luis J. Goicoechea, luis.goicoechea(at)unican.es
(End) L.J. Goicoechea [Univ. de Cantabria, Spain], P. Vannier [CDS] 26-Sep-2016