2006A&A...451..747E


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.15CEST07:50:18

2006A&A...451..747E - Astronomy and Astrophysics, volume 451, 747-757 (2006/6-1)

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. II. SDSS J0924+0219: the redshift of the lensing galaxy, the quasar spectral variability and the Einstein rings.

EIGENBROD A., COURBIN F., DYE S., MEYLAN G., SLUSE D., VUISSOZ C. and MAGAIN P.

Abstract (from CDS):

To provide the observational constraints required to use the gravitationally lensed quasar SDSS J0924+0219 for the determination of H0 from the time delay method. We measure here the redshift of the lensing galaxy, we show the spectral variability of the source, and we resolve the lensed host galaxy of the source. We present our VLT/FORS1 deep spectroscopic observations of the lensed quasar SDSS J0924+0219, as well as archival HST/NICMOS and ACS images of the same object. The two-epoch spectra, obtained in the Multi Object Spectroscopy (MOS) mode, allow for very accurate flux calibration and spatial deconvolution. This strategy provides spectra for the lensing galaxy and for the quasar images A and B, free of any mutual light contamination. We deconvolve the HST images as well, which reveal a double Einstein ring. The mass distributions in the lens, reconstructed in several ways, are compared. We determine the redshift of the lensing galaxy in SDSS J0924+0219: zlens=0.394±0.001. Only slight spectral variability is seen in the continuum of quasar images A and B, while the C III], Mg II and Fe II emission lines display obvious changes. The flux ratio between the quasar images A and B is the same in the emission lines and in the continuum. One of the Einstein rings found using deconvolution corresponds to the lensed quasar host galaxy at z=1.524 and a second bluer one, is the image either of a star-forming region in the host galaxy, or of another unrelated lower redshift object. A broad range of lens models give a satisfactory fit to the data. However, they predict very different time delays, making SDSS J0924+0219 an object of particular interest for photometric monitoring. In addition, the lens models reconstructed using exclusively the constraints from the Einstein rings, or using exclusively the astrometry of the quasar images, are not compatible. This suggests that multipole-like structures play an important role in SDSS J0924+0219.

Abstract Copyright:

Journal keyword(s): gravitational lensing - cosmology: cosmological parameters - quasars: individual: SDSSJ0924+0219 - dark matter

Nomenclature: Fig.1: [IBB2003] Star a (Nos d-e) added.

Simbad objects: 15

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Number of rows : 15

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 B0047-2808 G 00 49 41.896 -27 52 25.35   21.2   20.1   ~ 37 1
2 [IBB2003] Star c * 09 24 51.6829100029 +02 20 19.898200050           ~ 2 0
3 [IBB2003] Star d * 09 24 52.9790125237 +02 18 22.379217519           ~ 1 0
4 [IBB2003] Star b * 09 24 55.1770406571 +02 20 25.672436456           ~ 2 0
5 [IBB2003] SDSS J0924+0219 C LeI 09 24 55.7659 +02 19 24.691           ~ 14 0
6 [IBB2003] SDSS J0924+0219 gLS 09 24 55.80 +02 19 24.8           ~ 15 0
7 QSO J0924+0219 QSO 09 24 55.8048 +02 19 24.850   18.58 18.36     ~ 109 1
8 [IBB2003] SDSS J0924+0219 G G 09 24 55.8185 +02 19 24.509           ~ 11 1
9 [IBB2003] SDSS J0924+0219 A LeI 09 24 55.8293 +02 19 25.356           ~ 20 0
10 [IBB2003] SDSS J0924+0219 B LeI 09 24 55.8327 +02 19 23.565           ~ 19 0
11 UCAC2 32536800 * 09 24 55.8394812358 +02 21 30.468349482       14.83   ~ 1 0
12 [IBB2003] SDSS J0924+0219 D LeI 09 24 55.8653 +02 19 24.897           ~ 12 0
13 [IBB2003] Star a * 09 24 57.7272462831 +02 18 44.637487817   18.1   16.5   ~ 3 0
14 QSO B1104-181 QSO 11 06 33.39 -18 21 23.8   15.8 15.9 15.7   ~ 301 1
15 BD+25 2534 HS* 12 37 23.5157891619 +25 03 59.871049394 9.117 10.26 10.59 10.642 10.809 sdB1(k) 207 0

    Equat.    Gal    SGal    Ecl

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2020.07.15-07:50:18

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