Astronomy and Astrophysics, volume 327, L1-4 (1997/11-2)
HST confirmation of the lensed quasar J03.13.
SURDEJ J., CLAESKENS J.-F., REMY M., REFSDAL S., PIRENNE B., PRIETO A. and VANDERRIEST C.
Abstract (from CDS):
In order to definitely prove the claim by Claeskens et al. (1996A&A...305L...9C
) 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-β λ1025 and O VI λλ1031, 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-α) 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 5.2mag. with an angular separation ≥0.13".
- gravitational lensing - quasars: individual: J03.13 (CTS 286) - Techniques: image processing
Quasar J03.13 = CTS J03.13
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