2007A&A...465...51E


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.21CEST15:59:59

2007A&A...465...51E - Astronomy and Astrophysics, volume 465, 51-56 (2007/4-1)

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. VI. Redshift of the lensing galaxy in seven gravitationally lensed quasars.

EIGENBROD A., COURBIN F. and MEYLAN G.

Abstract (from CDS):

The knowledge of the redshift of a lensing galaxy that produces multiple images of a background quasar is essential to any subsequent modeling, whether related to the determination of the Hubble constant H0 or to the mass profile of the lensing galaxy. We present the results of our ongoing spectroscopic observations of gravitationally lensed quasars in order to measure the redshift of their lensing galaxies. We report on the determination of the lens redshift in seven gravitationally lensed systems. Our deep VLT/FORS1 spectra are spatially deconvolved in order to separate the spectrum of the lensing galaxies from the glare of the much brighter quasar images. Our observing strategy involves observations in Multi-Object-Spectroscopy (MOS) mode which allows the simultaneous observation of the target and of several crucial PSF and flux calibration stars. The advantage of this method over traditional long-slit observations is that it allows a much more reliable extraction and flux calibration of the spectra. We obtain the first reliable spectra of the lensing galaxies in six lensed quasars: FBQ 0951+2635 (zlens=0.260), BRI 0952-0115 (zlens=0.632), HE 2149-2745 (zlens=0.603), Q 0142-100 (zlens=0.491), SDSS J0246-0825 (zlens=0.723), and SDSS J0806+2006 (zlens=0.573). The last three redshifts also correspond to the Mg II doublet seen in absorption in the quasar spectra at the lens redshift. Our spectroscopic redshifts of HE 2149-2745 and FBQ 0951+2635 are higher than previously reported, which means that H0 estimates from these two systems must be revised to higher values. Finally, we reanalyse the blue side of our previously published spectra of Q 1355-2257 and find Mg II in absorption at z=0.702, confirming our previous redshift estimate. The spectra of all lenses are typical of early-type galaxies.

Abstract Copyright:

Journal keyword(s): gravitational lensing - cosmology: cosmological parameters

Simbad objects: 31

goto Full paper

goto View the reference in ADS

Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 CD-34 239 PM* 00 41 30.4742099792 -33 37 32.032402561 13.138 11.969 10.525 9.619 8.741 K9V 94 0
2 [SMS87] 0142-100 G G 01 44 -09.7           ~ 23 1
3 QSO B0142-100 QSO 01 45 16.5955770048 -09 45 17.269954127   17.23 16.95     ~ 218 1
4 QSO B0142-100B LeQ 01 45 17.3 -09 45 12     19.1     ~ 25 1
5 QSO B0142-100A LeQ 01 45 17.3 -09 45 12     16.9     ~ 35 1
6 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 114 0
7 [IBG2005] SDSS J0246-0825 B LeI 02 46 34.05 -08 25 35.7           ~ 5 1
8 [IBG2005] SDSS J0246-0825 G gLe 02 46 34.09 -08 25 35.9           ~ 4 1
9 [VV2006] J024634.1-082536 QSO 02 46 34.1072517858 -08 25 36.201597772   18.42 18.20 17.94   ~ 42 1
10 [IBG2005] SDSS J0246-0825 A LeI 02 46 34.11 -08 25 36.3           ~ 5 1
11 LP 995-86 PM* 03 48 22.6125635562 -39 08 37.013516494   13.61 13.15     F 86 0
12 HD 49798 HXB 06 48 04.7000758397 -44 18 58.432035331 6.758 8.017 8.287 8.391 8.543 sdO6 275 0
13 [IOB2006] SDSS J0806+2006 B LeQ 08 06 23.62 +20 06 31.1           ~ 11 1
14 [IOB2006] SDSS J0806+2006 G G 08 06 23.65 +20 06 31.4           ~ 4 1
15 [VV2006] J080623.6+200622 QSO 08 06 23.6770 +20 06 31.777   19.50 19.16     ~ 29 1
16 [IOB2006] SDSS J0806+2006 A LeQ 08 06 23.70 +20 06 31.9           ~ 11 1
17 [VV98] J095122.6+263513 QSO 09 51 22.5840 +26 35 13.786   17.66 17.31     ~ 91 1
18 [SGB98] J0951+2635 C gLe 09 51 22.59 +26 35 14.1   20.25 20.00     ~ 22 1
19 [SGB98] J0951+2635 A LeQ 09 51 22.629 +26 35 13.98   17.66 17.31     ~ 17 1
20 [SGB98] J0951+2635 B LeQ 09 51 22.695 +26 35 13.32   18.55 18.25     ~ 17 1
21 QSO B0952-0115A QSO 09 55 00 -01 30.1           ~ 6 0
22 QSO B0952-0115 QSO 09 55 00.1037541106 -01 30 06.549307797     18.7     ~ 130 1
23 [MIH92] 0952-0115 G G 09 55 00.11 -01 30 06.2           ~ 11 1
24 GD 108 HS* 10 00 47.2462037648 -07 33 30.777365253 12.406 13.349 13.563 13.662 13.781 sdB 127 1
25 QSO B1352-2242 QSO 13 55 43.4224 -22 57 23.388   18.2 18.2     ~ 24 1
26 QSO J1650+4251 QSO 16 50 43.4452605717 +42 51 49.356568069   17.78 17.58     ~ 46 1
27 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 213 0
28 QSO B2149-2745 QSO 21 52 07.4534 -27 31 49.718   18.70 18.39     ~ 96 2
29 [WKL96] HE 2149-2745 G gLe 21 52 07.48 -27 31 49.3           ~ 23 1
30 QSO B2149-2745A LeQ 21 52 07.53 -21 31 49.9   17.13 16.82     ~ 12 1
31 QSO B2149-2745B LeQ 21 55 -27.4   18.70 18.39     ~ 10 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2007A&A...465...51E and select 'bookmark this link' or equivalent in the popup menu


2019.09.21-15:59:59

© Université de Strasbourg/CNRS

    • Contact