Detection of the lensing galaxy in HE 2149-2745
ADS bibcode 1998A&A...339L..13L
astro-ph/9809170
S. Lopez [1], O. Wucknitz [1], L. Wisotzki [1]
- Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
Abstract
We have obtained new BVR-band images of the gravitationally lensed
QSO pair HE 2149-2745 A,B (QSO redshift 2.033; angular
separation 1.705"), under
1" seeing conditions.
Subtraction of a scaled point-spread-function reveals an
extended object of angular size comparable to the image separation
, and R
magnitude of 20.4 lying between and equidistant to the QSOs. The
geometry of the system leads us to interpret this object as the
lensing agent responsible for the double QSO images.
A fit to the galaxy surface brightness profile
indicates an elliptical galaxy, which is further supported by the
absence of Mg II in
absorption. The lensing galaxy is not detected in B and
V. We discuss
possible lens
models for this geometry constrained by our observations and
consequences for the
mass and redshift of the lens.
Key words:
quasars: individual: HE 2149 2745 quasars: general gravitational lensing
A&A 339 (1998) L13 (link to online journal)
ADS bibcode 1998A&A...339L..13L (link to ADS entry)
astro-ph/9809170 (link to e-print archive)
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