2008A&A...488..481V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST14:33:37

2008A&A...488..481V - Astronomy and Astrophysics, volume 488, 481-490 (2008/9-3)

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. VII. Time delays and the Hubble constant from WFI J2033-4723.

VUISSOZ C., COURBIN F., SLUSE D., MEYLAN G., CHANTRY V., EULAERS E., MORGAN C., EYLER M.E., KOCHANEK C.S., COLES J., SAHA P., MAGAIN P. and FALCO E.E.

Abstract (from CDS):

Gravitationally lensed quasars can be used to map the mass distribution in lensing galaxies and to estimate the Hubble constant H0 by measuring the time delays between the quasar images. Here we report the measurement of two independent time delays in the quadruply imaged quasar WFI J2033-4723 (z=1.66). Our data consist of R-band images obtained with the Swiss 1.2m EULER telescope located at La Silla and with the 1.3m SMARTS telescope located at Cerro Tololo. The light curves have 218 independent epochs spanning 3 full years of monitoring between March 2004 and May 2007, with a mean temporal sampling of one observation every 4th day. We measure the time delays using three different techniques, and we obtain ΔtB–A=35.5±1.4 days (3.8%) and ΔtB–C=62.6+4.1–2.3 days (+6.5%–3.7%), where A is a composite of the close, merging image pair. After correcting for the time delays, we find R-band flux ratios of FA/FB=2.88±0.04, FA/FC=3.38±0.06, and FA1/FA2=1.37±0.05 with no evidence for microlensing variability over a time scale of three years. However, these flux ratios do not agree with those measured in the quasar emission lines, suggesting that longer term microlensing is present. Our estimate of H0 agrees with the concordance value: non-parametric modeling of the lensing galaxy predicts H0=67+13–10km/s/Mpc, while the Single Isothermal Sphere model yields H0=63+7–3km/s/Mpc (68% confidence level). More complex lens models using a composite de Vaucouleurs plus NFW galaxy mass profile show twisting of the mass isocontours in the lensing galaxy, as do the non-parametric models. As all models also require a significant external shear, this suggests that the lens is a member of the group of galaxies seen in field of view of WFI J2033-4723.

Abstract Copyright:

Journal keyword(s): gravitational lensing - cosmology: cosmological parameters - quasars: individual: WFI J2033-4723

VizieR on-line data: <Available at CDS (J/A+A/488/481): table4.dat>

CDS comments: Fig.1: the 10 stars (PSF1 to PSF3 and S4 to S10) are identified as 2MASS JHHMMSSss+DDMMSSs stars in SIMBAD.

Simbad objects: 26

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Number of rows : 26

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 QSO J0158-4325 QSO 01 58 41.3988 -43 25 03.798   17.2 17.2     ~ 57 1
2 QSO B1104-181 QSO 11 06 33.39 -18 21 23.8   15.8 15.9 15.7   ~ 301 1
3 QSO J1415+1129 QSO 14 15 46.25 +11 29 43.4   17.63 17.23     ~ 595 1
4 QSO J1650+4251 QSO 16 50 43.4452605717 +42 51 49.356568069   17.78 17.58     ~ 49 1
5 2MASS J20332407-4725262 * 20 33 24.0653216818 -47 25 26.288239912           ~ 1 0
6 2MASS J20332992-4725500 * 20 33 29.9183648161 -47 25 50.186206590           ~ 1 0
7 USNO-B1.0 0426-00961946 * 20 33 30.2596421801 -47 22 23.125924448           ~ 1 0
8 2MASS J20333771-4726124 IR 20 33 37.7297755357 -47 26 12.419916367           ~ 1 0
9 USNO-B1.0 0426-00962002 * 20 33 39.1094662472 -47 22 20.960290789           ~ 1 0
10 UCAC2 11670165 * 20 33 40.7477469379 -47 23 28.948661329           ~ 1 0
11 [VV2006] J203342.1-472343 QSO 20 33 42.12 -47 23 43.9           ~ 84 1
12 USNO-B1.0 0426-00962058 * 20 33 48.2457536428 -47 23 47.035183961           ~ 1 0
13 USNO-B1.0 0426-00962071 PM* 20 33 50.3417844164 -47 21 39.185238016           ~ 1 0
14 2MASS J20335143-4723111 * 20 33 51.4624741544 -47 23 11.053362488           ~ 1 0
15 USNO-B1.0 0425-00967547 * 20 33 57.2370603060 -47 24 42.777406283           ~ 1 0
16 [MCS2004b] WFI J2033-4723 B LeI ~ ~           ~ 20 1
17 [MCS2004b] WFI J2033-4723 C LeI ~ ~           ~ 20 1
18 [MCS2004b] WFI J2033-4723 G1 G ~ ~           ~ 2 0
19 [MCS2004b] WFI J2033-4723 G3 G ~ ~           ~ 2 0
20 [MCS2004b] WFI J2033-4723 G2 G ~ ~           ~ 2 0
21 [MCS2004b] WFI J2033-4723 A1 LeI ~ ~           ~ 10 1
22 [MCS2004b] WFI J2033-4723 G6 G ~ ~           ~ 2 0
23 [MCS2004b] WFI J2033-4723 G4 G ~ ~           ~ 2 0
24 [MCS2004b] WFI J2033-4723 X1 ? ~ ~           ~ 2 0
25 [MCS2004b] WFI J2033-4723 G5 G ~ ~           ~ 2 0
26 [MCS2004b] WFI J2033-4723 A2 LeI ~ ~           ~ 10 1

    Equat.    Gal    SGal    Ecl

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2020.07.02-14:33:37

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