2018A&A...609A..71C


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.13CET11:47:17

2018A&A...609A..71C - Astronomy and Astrophysics, volume 609A, 71-71 (2018/1-1)

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., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., D'ANDREA C.B., DA COSTA L.N., 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. and WESTER W.

Abstract (from CDS):

We present time-delay measurements for the new quadruple imaged quasar DES J0408-5354, the first quadruple 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 qualityallows us to catch small photometric variations (a few mmag rms) of the quasar, acting on temporal scales much shorter than microlensing, and hence making the time delay measurement very robust against microlensing. In only seven months we very accurately measured one of the time delays in DES J0408-5354: Δt(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 measured two delays involving the D component of the system Δt(AD)=-155.5±12.8-days (8.2%) and Δt(BD)=-42.4±17.6-days (41%), where all the error bars include systematics. Turning these time delays into cosmological constraints will require deep Hubble Space Telescope (HST) imaging or ground-based adaptive optics (AO), and information on the velocity field of the lensing galaxy.

Abstract Copyright: © ESO, 2018

Journal keyword(s): methods: data analysis - gravitational lensing: strong - cosmological parameters

VizieR on-line data: <Available at CDS (J/A+A/609/A71): figure3.dat>

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [ALB2017] DES J0408-5354 B LeQ 04 08 21.49 -53 53 59.2           ~ 3 0
2 [ALB2017] DES J0408-5354 source QSO 04 08 21.70 -53 53 59.6           ~ 3 0
3 [ALB2017] DES J0408-5354 D LeQ 04 08 21.71 -53 53 58.1           ~ 3 0
4 [ALB2017] DES J0408-5354 G0 G 04 08 21.83 -53 54 05.9           ~ 2 0
5 [ALB2017] DES J0408-5354 A LeQ 04 08 21.92 -53 54 01.0           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2019.11.13-11:47:17

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