2011A&A...536A..53C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET06:42:05

2011A&A...536A..53C - Astronomy and Astrophysics, volume 536A, 53-53 (2011/12-1)

COSMOGRAIL: the COSmological MOnitoring of GRAvItational lenses. IX. Time delays, lens dynamics and baryonic fraction in He 0435-1223.

COURBIN F., CHANTRY V., REVAZ Y., SLUSE D., FAURE C., TEWES M., EULAERS E., KOLEVA M., ASFANDIYAROV I., DYE S., MAGAIN P., VAN WINCKEL H., COLES J., SAHA P., IBRAHIMOV M. and MEYLAN G.

Abstract (from CDS):

We present accurate time delays for the quadruply imaged quasar HE 0435-1223. The delays were measured from 575 independent photometric points obtained in the R-band between January 2004 and March 2010. With seven years of data, we clearly show that quasar image A is affected by strong microlensing variations and that the time delays are best expressed relative to quasar image B. We measured ΔtBC=7.8±0.8-days, ΔtBD=-6.5±0.7-days and ΔtCD=-14.3±0.8-days. We spacially deconvolved HST NICMOS2 F160W images to derive accurate astrometry of the quasar images and to infer the light profile of the lensing galaxy. We combined these images with a stellar population fitting of a deep VLT spectrum of the lensing galaxy to estimate the baryonic fraction, fb, in the Einstein radius. We measured fb=0.65+0.13–0.10 if the lensing galaxy has a Salpeter IMF and fb=0.45+0.04–0.07 if it has a Kroupa IMF. The spectrum also allowed us to estimate the velocity dispersion of the lensing galaxy, σap=222±34km/s. We used fb and σap to constrain an analytical model of the lensing galaxy composed of an Hernquist plus generalized NFW profile. We solved the Jeans equations numerically for the model and explored the parameter space under the additional requirement that the model must predict the correct astrometry for the quasar images. Given the current error bars on fb and σap, we did not constrain H0 yet with high accuracy, i.e., we found a broad range of models with χ2<1. However, narrowing this range is possible, provided a better velocity dispersion measurement becomes available. In addition, increasing the depth of the current HST imaging data of HE 0435-1223 will allow us to combine our constraints with lens reconstruction techniques that make use of the full Einstein ring that is visible in this object.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/536/A53): fig3.dat>

Simbad objects: 9

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Number of rows : 9

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 [MKP2005] G22 G 04 38 14.724 -12 17 18.20     22.253   21.260 ~ 14 1
2 [WSB2002] 0435-1223 C LeQ 04 38 14.73 -12 17 15.0     19.149   19.631 ~ 34 0
3 [WSB2002] 0435-1223 B LeQ 04 38 14.80 -12 17 13.8     19.082   19.623 ~ 37 0
4 [WSB2002] 0435-1223 D LeQ 04 38 14.84 -12 17 16.0     19.196   19.824 ~ 36 0
5 [VV2006] J043814.8-122314 QSO 04 38 14.88 -12 17 14.6     17.15     ~ 185 2
6 [WSB2002] 0435-1223 G G 04 38 14.88 -12 17 14.6     20.80   19.83 ~ 24 0
7 [WSB2002] 0435-1223 A LeQ 04 38 14.90 -12 17 14.4     18.545   19.106 ~ 35 0
8 QSO B2016+112 QSO 20 19 18.2 +11 27 14     22.5     ~ 192 1

    Equat.    Gal    SGal    Ecl

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2021.03.02-06:42:05

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