J/ApJ/937/34 14.5yr r-band phot. of ClG J1004+4142 QSO images (Munoz+, 2022)
The longest delay: a 14.5yr campaign to determine the third time delay in the
lensing cluster SDSS J1004+4112.
Munoz J.A., Kochanek C.S., Fohlmeister J., Wambsganss J., Falco E.,
Fores-Toribio R.
<Astrophys. J., 937, 34 (2022)>
=2022ApJ...937...34M 2022ApJ...937...34M
ADC_Keywords: Clusters, galaxy; Gravitational lensing; Photometry; Optical; QSOs
Keywords: Gravitational lensing ; Strong gravitational lensing ;
Galaxy clusters ; Quasars ; Photometry ; Light curves
Abstract:
We present new light curves for the four bright images of the five
image cluster-lensed quasar gravitational lens system SDSS J1004+4112.
The light curves span 14.5yr and allow the measurement of the time
delay between the trailing bright quasar image D and the leading image
C. When we fit all four light curves simultaneously and combine the
models using the Bayesian information criterion, we find a time delay
of ΔtDC=2458.47±1.02d (6.73yr), the longest ever measured
for a gravitational lens. For the other two independent time delays we
obtain ΔtBC=782.20±0.43d (2.14yr) and
ΔtAC=825.23±0.46d (2.26yr), in agreement with previous
results. The information criterion is needed to weight the results for
light curve models with different polynomial orders for the intrinsic
variability and the effects of differential microlensing. The results
using the Akaike information criterion are slightly different, but, in
practice, the absolute delay errors are all dominated by the ∼4%
cosmic variance in the delays rather than the statistical or
systematic measurement uncertainties. Despite the lens being a
cluster, the quasar images show slow differential variability due to
microlensing at the level of a few tenths of a magnitude.
Description:
The new observations were all acquired at the Fred Lawrence Whipple
Observatory (FLWO) 1.2m, on Mount Hopkins. Our standard observations
consisted of two consecutive, unguided 300s exposures with the Sloan
r filter using the Keplercam CCD.
We analyzed all of the Keplercam observations, a total of 797 epochs,
including the 88 and 85 epochs already published in
Fohlmeister+ 2007, J/ApJ/662/62 and Fohlmeister+ 2008ApJ...676..761F 2008ApJ...676..761F,
respectively.
The data span 14.5yr, from 2003 December 20, until 2018 June 21.
See Section 2.
Objects:
-------------------------------------------------------------
RA (ICRS) DE Designation(s)
-------------------------------------------------------------
10 04 34.2 +41 12 43 SDSS J1004+4112 = ClG J1004+4112
-------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 1018 Light curves in r-band magnitude for the four
quasar images
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See also:
J/ApJ/662/62 : Optical monitoring of SDSS J1004+4112 (Fohlmeister+, 2007)
J/MNRAS/450/3665 : CoMaLit. III. LC2 catalog (Sereno+, 2015)
J/ApJ/807/178 : Newly rich gal. clusters identified in SDSS-DR12 (Wen+, 2015)
J/MNRAS/455/892 : Galaxy cluster concentration-mass relation (Groener+, 2016)
J/A+A/618/A56 : Gaia GraL. II. Known mult. imaged quasars (Ducourant+, 2018)
J/A+A/634/A27 : SDSS J1004+4112 spectra (Popovic+, 2020)
J/A+A/638/A114 : CODEX galaxy clusters catalog (Finoguenov+, 2020)
J/MNRAS/503/5763 : SPIDERS galaxy clusters catalogue (Kirkpatrick+, 2021)
J/ApJ/911/82 : Sparsity & gas mass fraction of gal. cl. (Corasaniti+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 d JD [2993.5/8290.7] Julian Date of observation;
JD-2450000
10- 15 F6.3 mag magA [18.93/20.4] Magnitude of image A
17- 21 F5.3 mag e_magA [0.006/0.12] Uncertainty in magA
23- 28 F6.3 mag magB [19.14/21.03] Magnitude of image B
30- 34 F5.3 mag e_magB [0.006/0.2] Uncertainty in magB
36- 41 F6.3 mag magC [19.35/20.8] Magnitude of image C
43- 47 F5.3 mag e_magC [0.01/0.3] Uncertainty in magC
49- 54 F6.3 mag magD [19.56/21.52] Magnitude of image D
56- 60 F5.3 mag e_magD [0.019/0.4] Uncertainty in magD
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Aug-2024