2007A&A...464..845V


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET05:23:58

2007A&A...464..845V - Astronomy and Astrophysics, volume 464, 845-851 (2007/3-4)

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. V. The time delay in SDSS J1650+4251.

VUISSOZ C., COURBIN F., SLUSE D., MEYLAN G., IBRAHIMOV M., ASFANDIYAROV I., STOOPS E., EIGENBROD A., LE GUILLOU L., VAN WINCKEL H. and MAGAIN P.

Abstract (from CDS):

Our aim is to measure the time delay between the two gravitationally lensed images of the zqso=1.547 quasar SDSS J1650+4251, in order to estimate the Hubble constant H0. Our measurement is based on R-band light curves with 57 epochs obtained at Maidanak Observatory, in Uzbekistan, from May 2004 to September 2005. The photometry is performed using simultaneous deconvolution of the data, which provides the individual light curves of the otherwise blended quasar images. The time delay is determined from the light curves using two very different numerical techniques, i.e., polynomial fitting and direct cross-correlation. The time delay is converted into H0 following analytical modeling of the potential well. Our best estimate of the time delay is Δt=49.5±1.9days, i.e., we reach a 3.8% accuracy. The R-band flux ratio between the quasar images, corrected for the time delay and for slow microlensing, is FA/FB=6.2±5%. The accuracy reached on the time delay allows us to discriminate well between families of lens models. As for most other multiply imaged quasars, only models of the lensing galaxy that have a de Vaucouleurs mass profile plus external shear give a Hubble constant compatible with the current most popular value (H0=72±8km/s/Mpc). A more realistic singular isothermal sphere model plus external shear gives H0=51.7+4.0–3.0km/s/Mpc.

Abstract Copyright:

Journal keyword(s): gravitational lensing - galaxies: quasars: individual: J1650+4251 - cosmology: cosmological parameters

CDS comments: Fig. 1 : stars PSF 1, PSF 2, #3, #4, #5 not in SIMBAD.

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 - 2021
#notes
1 QSO B1104-181 QSO 11 06 33.39 -18 21 23.8   15.8 15.9 15.7   ~ 307 1
2 [MSR2003] J1650+4251 B LeI 16 50 43.4448 +42 51 49.221           ~ 3 1
3 [MSR2003] J1650+4251 G G 16 50 43.4448 +42 51 49.221           ~ 8 1
4 [MSR2003] J1650+4251 A LeI 16 50 43.4448 +42 51 49.221           ~ 3 1
5 QSO J1650+4251 QSO 16 50 43.4452605717 +42 51 49.356568069   17.78 17.58     ~ 53 1

    Equat.    Gal    SGal    Ecl

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