Letter to the Editor
HST confirmation of the lensed quasar J03.13 *
M. Remy 1,
S. Refsdal 2,
B. Pirenne 3,
A. Prieto 4 and
Ch. Vanderriest 5
Received 5 August 1997 / Accepted 29 August 1997
In order to definitely prove the claim by Claeskens et al. (1996) that J03.13 is a doubly imaged quasar, WFPC2 direct imaging and FOS spectroscopy of this compact system have been obtained with HST. These textbook case observations clearly show that J03.13 consists of two point-like images separated by 0.849 0.001 with a magnitude difference of 2.14 0.03 in V and I. We see no trace of a lensing galaxy. From the FOS observations, we find that J03.13 A and B have identical spectra within the measurement uncertainties. The data also show that spectroscopic contamination of B by A is negligible. We do confirm the redshift z = 2.545 for J03.13 A and B (emission-lines due to Ly 1025 and OVI 1031, 1037 are also detected), first derived from an unresolved ground-based spectrum of the two components by Claeskens et al. We also find that the absorption line system at z = 2.344 (CIV and Ly ) is present in the spectra of A and B. On the contrary, the absorption line system at z = 1.085 (MgII) is only present in the spectrum of J03.13 A. If this latter system is associated with the lens, we may expect that image A consists of two radially merging images with a very small angular separation. From the WFPC2 imagery, we can rule out the presence of a third component fainter than A by up to 5.2 mag. with an angular separation 0.13 .
Key words: gravitational lensing quasars: individual: J03.13 Techniques: image processing
* Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
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© European Southern Observatory (ESO) 1997
Online publication: April 6, 1998