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Astron. Astrophys. 357, 115-119 (2000)

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The extinction curve of the lensing galaxy of B1152+199 at z = 0.44 *

S. Toft 1, J. Hjorth 1 and I. Burud 2

1 University of Copenhagen, Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen O, Denmark
2 Universite de Liège, Institut d'Astrophysique et deeGophysique, Avenue de Cointe 5, 4000 Liège, Belgium

Received 8 February 2000 / Accepted 11 February 2000

Abstract

We present [FORMULA] photometry of the gravitational lens candidate CLASS B1152+119 obtained with the Nordic Optical Telescope. The two QSO components are resolved in the B, V, R, I and [FORMULA] bands confirming the lensing nature of the system. The [FORMULA] lens galaxy is clearly detected in B, R, I and [FORMULA] and its position is found to be almost coincident with the faint QSO image which is heavily extincted (relative to the brighter QSO image) by dust in the lens galaxy. The extinction curve of the lens galaxy derived from the relative photometry is well fitted by a Galactic extinction law with [FORMULA] and [FORMULA]. From a simple model of the system we predict a time delay of [FORMULA] 60 days.

Key words: galaxies: quasars: individual: B1152+199 – galaxies: ISM – ISM: dust, extinction – ISM: evolution – cosmology: gravitational lensing

* Nordic Optical Telescope is operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

Send offprint requests to: S. Toft (toft@astro.ku.dk)

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© European Southern Observatory (ESO) 2000

Online publication: May 3, 2000
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