Astron. J., 120, 2868-2878 (2000/December-0)
PMN J1838-3427: a new gravitationally lensed quasar.
WINN J.N., HEWITT J.N., SCHECHTER P.L., DRESSLER A., FALCO E.E., IMPEY C.D., KOCHANEK C.S., LEHAR J., LOVELL J.E.J., McLEOD B.A., MORGAN N.D., MUNOZ J.A., RIX H.-W. and RUIZ M.T.
Abstract (from CDS):
We report the discovery of a new double-image quasar that was found during a search for gravitational lenses in the southern sky. Radio source PMN J1838-3427 is composed of two flat-spectrum components with separation 1".0, flux density ratio 14:1, and matching spectral indices in VLA and VLBA images. Ground-based BRI images show the optical counterpart (total I=18.6) is also double, with the same separation and position angle as the radio components. An HST/WFPC2 image reveals the lens galaxy. The optical flux ratio (27:1) is higher than the radio value, probably because of differential extinction of the components by the lens galaxy. An optical spectrum of the bright component contains quasar emission lines at z=2.78 and several absorption features, including prominent Lyα absorption. The lens galaxy redshift could not be measured, but it is estimated to be z=0.36±0.08. The image configuration is consistent with the simplest plausible models for the lens potential. The flat radio spectrum and observed variability of PMN J1838-3427 suggest that the time delay between flux variations of the components is measurable and could thus provide an independent measurement of H0.
Cosmology: Distance Scale - Cosmology: Gravitational Lensing - quasars: individual (PMN J1838-3427)
Table 4: [WHS2000] PMN J1838-3427A (Nos A-B), [WHS2000] A (Nos G, S), [WHS2000] a (Nos p, q). Table 6: [WHS2000] NN (Nos 1-12).
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