J/A+A/609/A71 R-band light curves of DES J0408-5359 (Courbin+ 2018)
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses.
XVI. Time delays for the quadruply imaged quasar DES J0408-5354 with
high-cadence photometric monitoring.
Courbin F., Bonvin V., Buckley-Geer E., Fassnacht C.D., Frieman J., Lin H.,
Marshall P.J., Suyu S.H., Treu T., Anguita T., Motta V., Meylan G., Paic E.,
Tewes M., Agnello A., Chao D.C.-Y., Chijani M., Gilman D., Rojas K.,
Williams P., Hempel A., Kim S., Lachaume R., Rabus M., Abbott T.M.C.,
Allam S., Annis J., Banerji M., Bechtol K., Benoit-Levy A., Brooks D.,
Burke D.L., Rosell A.Carnero , Kind M.Carrasco , Carretero J.,
D'Andrea C.B., Costa L.N.da , Davis C., DePoy D.L., Desai S., Flaugher B.,
Fosalba P., Garcia-Bellido J., Gaztanaga E., Goldstein D.A., Gruen D.,
Gruendl R.A., Gschwend J., Gutierrez G., Honscheid K., James D.J., Kuehn K.,
Kuhlmann S., Kuropatkin N., Lahav O., Lima M., Maia M.A.G., March M.,
Marshall J.L., McMahon R.G., Menanteau F., Miquel R., Nord B., Plazas A.A.,
Sanchez E., Scarpine V., Schindler R., Schubnell M., Sevilla-Noarbe I.,
Smith M., Soares-Santos M., Sobreira F., Suchyta E., Tarle G., Tucker D.L.,
Walker A.R., Wester W.
<Astron. Astrophys. 609, A71 (2018)>
=2018A&A...609A..71C 2018A&A...609A..71C (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Gravitational lensing ; Photometry
Keywords: methods: data analysis - gravitational lensing: strong -
cosmological parameters
Abstract:
We present time-delay measurements for the new quadruply imaged quasar
DES J0408-5354, the first quadruply imaged quasar found in the Dark
Energy Survey (DES). Our result is made possible by implementing a new
observational strategy using almost daily observations with the MPIA
2.2m telescope at La Silla observatory and deep exposures reaching a
signal-to-noise ratio of about 1000 per quasar image. This data
quality allows us to catch small photometric variations (a few mmag
rms) of the quasar, acting on temporal scales much shorter than
microlensing, hence making the time delay measurement very robust
against microlensing. In only 7 months we measure very accurately one
of the time delays in DES J0408-5354: Dt(AB)=-112.1±2.1-days (1.8%)
using only the MPIA 2.2m data. In combination with data taken with the
1.2m Euler Swiss telescope, we also measure two delays involving the D
component of the system Dt(AD)=-155.5±12.8-days (8.2%) and
Dt(BD)=-42.4±17.6-days (41%), where all the error bars include
systematics. Turning these time delays into cosmological constraints
will require deep HST imaging or ground-based Adaptive Optics (AO),
and information on the velocity field of the lensing galaxy.
Description:
We have been monitoring the quadruply lensed quasar DES J0408-5354
since July 2016 with different telescopes in the R band (∼600-720nm).
The resulting R-band light curves of the quadruply lensed quasar
DES J0408-5354, is displayed in Fig. 3 of the paper.
The light curves are obtained using deconvolution photometry of images
from 42 different telescopes (the MPIA 2.2m and the ESO Euler 1.2m).
Objects:
-----------------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------------
04 08 21.92 -53 54 01.0 DES J0408-5354 A
04 08 21.49 -53 53 59.2 DES J0408-5354 B
04 08 21.71 -53 53 58.1 DES J0408-5354 D
-----------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
figure3.dat 74 143 R-band light curves of DES J0408-5359
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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 : The doubly lensed quasar SDSS J1001+5027 (Rathna Kumar+, 2013)
Byte-by-byte Description of file: figure3.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d MHJD Modified Julian Date (heliocentric)
13- 21 F9.5 mag magA Relative magnitude of quasar image A
23- 29 F7.5 mag e_magA Magnitude uncertainty of quasar image A
31- 39 F9.5 mag magB Relative magnitude of quasar image B
41- 47 F7.5 mag e_magB Magnitude uncertainty of quasar image B
49- 57 F9.5 mag magD Relative magnitude of quasar image D
59- 65 F7.5 mag e_magD Magnitude uncertainty of quasar image D
67- 74 A8 mag Tel Name of the instrument used
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Acknowledgements:
Vivien Bonin, vivien.bonvin(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
Saha 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
(End) Vivien Bonvin [EPFL, Switzerland], Patricia Vannier [CDS] 06-Nov-2017