J/A+A/640/A105 R-band light curves of 23 lensed QSOs (Millon+, 2020)
COSMOGRAIL XIX: Time delays in 18 strongly lensed quasars from 15 years of
optical monitoring.
Millon M., Courbin F., Bonvin V., Paic E., Meylan G., Tewes M., Sluse D.,
Magain P., Chan J.H.H., Galan A., Joseph R., Lemon C., Tihhonova O.,
Anderson R.I., Marmier M., Chazelas B., Lendl M., Triaud A.H.M.J.,
Wyttenbach A.
<Astron. Astrophys. 640, A105 (2020)>
=2020A&A...640A.105M 2020A&A...640A.105M (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Gravitational lensing ; Photometry
Keywords: methods: data analysis - gravitational lensing: strong -
cosmological parameters
Abstract:
We present the results of 15 years of monitoring lensed quasars, which
was conducted by the COSMOGRAIL programme at the Leonhard Euler 1.2m
Swiss Telescope. The decade-long light curves of 23 lensed systems are
presented for the first time. We complement our data set with other
monitoring data available in the literature to measure the time delays
in 18 systems, among which nine reach a relative precision better than
15% for at least one time delay. To achieve this, we developed an
automated version of the curve-shifting toolbox PyCS to ensure robust
estimation of the time delay in the presence of microlensing, while
accounting for the errors due to the imperfect representation of
microlensing. We also re-analysed the previously published time delays
of RXj1131-1231 and HE0435-1223, by adding six and two new seasons of
monitoring, respectively, and confirming the previous time-delay
measurements. When the time delay measurement is possible, we
corrected the light curves of the lensed images from their time delay
and present the difference curves to highlight the microlensing signal
contained in the data. To date, this is the largest sample of
decade-long lens monitoring data, which is useful to measure $H_0$ and
the size of quasar accretion discs with microlensing as well as to
study quasar variability.
Description:
R-band cosmograil light curves of lensed quasars taken at the Euler
1.2m Swiss telescope with the EulerCAM and EulerC2 instrument.
Additional data taken at the SMARTS 1.3m telescope with the ANDICAM
optical/ infrared camera are also included for SDSS J0924+0219
(MacLeod et al., 2015ApJ...806..258M 2015ApJ...806..258M, Cat. J/ApJ/806/258).
For HE 0435-1223 and RX J1131-1231, data taken at the 1.5m telescope
at the Maidanak Observatory, the Mercator Belgian telescope and at the
SMARTS 1.3 m telescope are included (Courbin et al.
2011A&A...536A..53C 2011A&A...536A..53C, Cat, J/A+A/536/A53, Tewes et al.
2013A&A...553A.120T 2013A&A...553A.120T, 2013A&A...556A..22T 2013A&A...556A..22T, Cat. J/A+A/556/A22). For
SDSS J1515+1511, we had the data from Shalyapin & Goicoechea
(2017ApJ...836...14S 2017ApJ...836...14S) from the Liverpool Telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 100 23 List of studied stars
lcab/* . 17 R-band light curves with A and B images
lcabcd/* . 4 R-band light curves with images ABCD or ABC
lcapd/* . 1 R-band light curves of SDSS J0924+0219
lcapb/* . 1 R-band light curves of HE 0230-2130
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See also:
J/A+A/488/481 : Time delays and H0 from WFI J2033-4723 (Vuissoz+, 2008)
J/A+A/536/A53 : R-band light curves of HE 0435-1223 (Courbin+, 2011)
J/A+A/553/A121 : 2 lensed quasars light curves (Eulaers+, 2013)
J/A+A/556/A22 : R-band light curves of RX J1131-1231 (Tewes+, 2013)
J/A+A/557/A44 : Doubly lensed quasar SDSS J1001+5027 (Rathna Kumar+, 2013)
J/MNRAS/465/4914 : R-band light curves of HE 0435-1223 (Bonvin+, 2017)
J/A+A/609/A71 : R-band light curves of DES J0408-5359 (Courbin+ 2018)
J/A+A/616/A183 : R-band light curves of PG 1115+080 (Bonvin+, 2018)
J/A+A/629/A97 : R-band light curves of WFI2033-4723 (Bonvin+, 2019)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Star name
20- 21 I2 h RAh Simbad right ascension (J2000)
23- 24 I2 min RAm Simbad right ascension (J2000)
26- 30 F5.2 s RAs Simbad right ascension (J2000)
32 A1 --- DE- Simbad declination sign (J2000)
33- 34 I2 deg DEd Simbad declination (J2000)
36- 37 I2 arcmin DEm Simbad declination (J2000)
39- 42 F4.1 arcsec DEs Simbad declination (J2000)
44- 67 A24 ---- FileName Name of the R light curve file
69-100 A32 --- SName Simbad name
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Byte-by-byte Description of file: lcab/*
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Median Heliocentric Julian Date (HJD-2400000)
13- 21 F9.5 mag magA Relative magnitude of image A
23- 29 F7.5 mag e_magA Relative magnitude error of image A
31- 39 F9.5 mag magB Relative magnitude of image B
41- 47 F7.5 mag e_magB Relative magnitude error of image B
49- 59 A11 --- Tel Telescope used for the observation
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Byte-by-byte Description of file: lcabcd/*
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Median Heliocentric Julian Date (HJD-2400000)
13- 21 F9.5 mag magA Relative magnitude of image A
23- 29 F7.5 mag e_magA Relative magnitude error of image A
31- 39 F9.5 mag magB Relative magnitude of image B
41- 47 F7.5 mag e_magB Relative magnitude error of image B
49- 57 F9.5 mag magC Relative magnitude of image C
59- 65 F7.5 mag e_magC Relative magnitude error of image C
67- 75 F9.5 mag magD ? Relative magnitude of image D (1)
77- 83 F7.5 mag e_magD ? Relative magnitude error of image D (1)
85- 97 A13 --- Tel Telescope used for the observation
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Note (1): Not for WFI2026_Euler.dat
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Byte-by-byte Description of file: lcapd/*
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Median Heliocentric Julian Date (HJD-2400000)
13- 21 F9.5 mag magA+D Relative magnitude of image A+D
23- 29 F7.5 mag e_magA+D Relative magnitude error of image A+D
31- 39 F9.5 mag magB Relative magnitude of image B
41- 47 F7.5 mag e_magB Relative magnitude error of image B
49- 57 F9.5 mag magC Relative magnitude of image C
59- 65 F7.5 mag e_magC Relative magnitude error of image C
67- 79 A13 --- Tel Telescope used for the observation
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Byte-by-byte Description of file: lcapb/*
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Median Heliocentric Julian Date (HJD-2400000)
13- 21 F9.5 mag magA+B Relative magnitude of image A+B (1)
23- 29 F7.5 mag e_magA+B Relative magnitude error of image A+B (1)
31- 38 F8.5 mag magC Relative magnitude of image C
40- 46 F7.5 mag e_magC Relative magnitude error of image C
48- 55 F8.5 mag magD Relative magnitude of image D
57- 63 F7.5 mag e_magD Relative magnitude error of image D
65- 77 A13 --- Tel Telescope used for the observation
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Note (1): Flux of image A and B have been summed due to low image separation.
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Acknowledgements:
Martin Millon, martin.millon(at)epfl.ch
References:
Eigenbrod et al., Paper I 2005A&A...436...25E 2005A&A...436...25E
Eigenbrod et al., Paper II 2006A&A...451..747E 2006A&A...451..747E
Eigenbrod et al., Paper III 2006A&A...451..759E 2006A&A...451..759E
Sama et al., Paper IV 2006A&A...450..461S 2006A&A...450..461S
Vuissoz et al., Paper V 2007A&A...464..845V 2007A&A...464..845V
Eigenbrod et al., Paper VI 2007A&A...465...51E 2007A&A...465...51E
Vuissoz et al., Paper VII 2008A&A...488..481V 2008A&A...488..481V, Cat. J/A+A/488/481
Chantry et al., Paper VIII 2010A&A...522A..95C 2010A&A...522A..95C
Courbin et al., Paper IX 2011A&A...536A..53C 2011A&A...536A..53C, Cat. J/A+A/536/A53
Sluse et al., Paper X 2012A&A...538A..99S 2012A&A...538A..99S
Tewes et al., Paper XI 2013A&A...553A.120T 2013A&A...553A.120T
Eulaers et al., Paper XII 2013A&A...553A.121E 2013A&A...553A.121E, Cat. J/A+A/553/A121
Tewes et al., Paper XIII 2013A&A...556A..22T 2013A&A...556A..22T, Cat. J/A+A/556/A22
Rathna Kumar et al., Paper XIV 2013A&A...557A..44R 2013A&A...557A..44R, Cat. J/A+A/557/A44
Bonvin et al., Paper XV 2016A&A...585A..88B 2016A&A...585A..88B
Courbin et al., Paper XVI 2018A&A...609A..71C 2018A&A...609A..71C, Cat. J/A+A/609/A71
Bonvin et al., Paper XVII 2018A&A...616A.183B 2018A&A...616A.183B, Cat. J/A+A/616/A183
Bonvin et al., Paper XVIII 2019A&A...629A..97B 2019A&A...629A..97B, Cat. J/A+A/629/A97
(End) Martin Millon [EPFL, Switzerland], Patricia Vannier [CDS] 16-Jun-2020