Bibcode
Vanderriest, C.; Prieto, M. A.; Pirenne, B.; Refsdal, S.; Remy, M.; Claeskens, J.-F.; Surdej, J.
Referencia bibliográfica
Astronomy and Astrophysics, v.327, p.L1-L4
Fecha de publicación:
11
1997
Revista
Número de citas
19
Número de citas referidas
18
Descripción
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".