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PMN J1838-3427: A New Gravitationally Lensed Quasar


Winn, JN and Hewitt, JN and Schechter, PL and Dressler, A and Falco, EF and Impey, CD and Kochanek, CS and Lehar, J and Lovell, JEJ and McLeod, BA and Morgan, ND and Munoz, JA and Rix, HW and Ruiz, MT, PMN J1838-3427: A New Gravitationally Lensed Quasar, The Astronomical Journal, 120, (6) pp. 2868-2878. ISSN 0004-6256 (2000) [Refereed Article]

DOI: doi:10.1086/316874


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 I″.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 H 0 .

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:46915
Year Published:2000
Web of Science® Times Cited:33
Deposited By:Physics
Deposited On:2007-09-05
Last Modified:2011-11-28

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