J/A+A/634/A27 SDSS J1004+4112 spectra (Popovic+, 2020)
Spectroscopy and polarimetry of the gravitationally lensed quasar
SDSS J1004+4112 with the 6m SAO RAS telescope.
Popovic L.C., Afanasiev V.L., Moiseev A., Smirnova A., Simic S., Savic Dj.,
Mediavilla E.G., Fian C.
<Astron. Astrophys. 634, A27 (2020)>
=2020A&A...634A..27P 2020A&A...634A..27P (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Gravitational lensing ; Spectroscopy
Keywords: gravitational lensing: strong - quasars: individual: SDSS J1004+4112 -
lines: profiles - polarization
Abstract:
We present new spectroscopic and polarimetric observations of the
gravitational lens SDSS J1004+4112 taken with the 6m
telescope of the Special Astrophysical Observatory (SAO, Russia).
In order to explain the variability that is observed only in the blue
wing of the CIV emission line, corresponding to image A, we analyze
the spectroscopy and polarimetry of the four images of the lensed
system.
Spectra of the four images were taken in 2007, 2008, and 2018, and
polarization was measured in the period 2014-2017. Additionally, we
modeled the microlensing effect in the polarized light, assuming that
the source of polarization is the equatorial scattering in the inner
part of the torus.
We find that a blue enhancement in the CIV line wings affects
component A in all three epochs. We also find that the UV continuum of
component D was amplified in the period 2007-2008, and that the red
wings of CIII] and CIV appear brighter in D than in the other three
components. We report significant changes in the polarization
parameters of image D, which can be explained by microlensing. Our
simulations of microlensing of an equatorial scattering region in the
dusty torus can qualitatively explain the observed changes in the
polarization degree and angle of image D.We do not detect significant
variability in the polarization parameters of the other images (A, B,
and C), although the averaged values of the polarization degree and
angle are different for the different images.
Microlensing of a broad line region model including a compact
outflowing component can qualitatively explain the CIV blue wing
enhancement (and variation) in component A. However, to confirmed this
hypothesis, we need additional spectroscopic observation in future.
Description:
J1004+4112 was observed with the integral-field MultiPupil
Fiber Spectrograph (MPFS) located at the prime focus of the 6m
telescope of the SAO of the Russian Academy of Sciences (SAO RAS).
Objects:
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RA (2000) DE Designation(s)
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10 04 34.92 +41 12 42.8 SDSS J1004+4112 = QSO J1004+4112
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
s160507.dat 60 1150 Spectrum of ABCD images, 16/05/2007
16-05-2007.ps 82 1217 ps file shows spectra of the four J1004+4112
images, 16/05/2007
s271008.dat 60 1150 Spectrum of ABCD images, 27/10/2008
27-10-2008.ps 82 958 ps file shows spectra of the four J1004+4112
images, 27/10/2008
s070218.dat 60 1150 Spectrum of ABCD images, 07/02/2018
07-02-2018.ps 82 1391 ps file shows spectra of the four J1004+4112
images, 07/02/2018
s160507a.dat 27 1560 Image A spectrum, 16/05/2007
s160507b.dat 27 1560 Image B spectrum, 16/05/2007
s160507c.dat 27 1560 Image C spectrum, 16/05/2007
s160507d.dat 27 1560 Image D spectrum, 16/05/2007
s271008a.dat 27 2048 Image A spectrum, 27/10/2008
s271008b.dat 27 2048 Image B spectrum, 27/10/2008
s271008c.dat 27 2048 Image C spectrum, 27/10/2008
s271008d.dat 27 2048 Image D spectrum, 27/10/2008
s070218a.dat 26 3496 Image A spectrum, 07/02/2018
s070218b.dat 26 3496 Image B spectrum, 07/02/2018
s070218c.dat 26 3496 Image C spectrum, 07/02/2018
s070218d.dat 26 3496 Image D spectrum, 07/02/2018
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Byte-by-byte Description of file: s070218.dat s160507.dat s271008.dat
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Bytes Format Units Label Explanations
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1- 4 I4 0.1nm Lambda Wavelength
7- 18 E12.6 10mW/m2/nm FluxA Image A flux (in erg/cm2/Å)
20- 32 E13.6 10mW/m2/nm FluxB Image B flux (in erg/cm2/Å)
34- 46 E13.6 10mW/m2/nm FluxC Image C flux (in erg/cm2/Å)
48- 60 E13.6 10mW/m2/nm FluxD Image D flux (in erg/cm2/Å)
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Byte-by-byte Description of file: s*[abcd].dat
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Bytes Format Units Label Explanations
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7- 13 F7.2 0.1nm Lambda Wavelength
15- 27 E13.6 10mW/m2/nm Flux Image flux (in erg/cm2/Å)
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Acknowledgements:
Luka Popovic, lpopovic(at)aob.rs
(End) Patricia Vannier [CDS] 17-Jan-2020