PMN J1838−3427: A New Gravitationally Lensed Quasar | Zendy

Joshua N. Winn | Zendy; Jacqueline N. Hewitt | Zendy; Paul L. Schechter | Zendy; Alan Dressler | Zendy; E. Falco | Zendy; C. D. Impey | Zendy; C. S. Kochanek | Zendy; Joseph Lehár | Zendy; J. E. J. Lovell | Zendy; B. A. McLeod | Zendy; N. D. Morgan | Zendy; J. A. Muñoz | Zendy; HansWalter Rix | Zendy; M. T. Ruíz | Zendy

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PMN J1838−3427: A New Gravitationally Lensed Quasar

Author(s) -

Joshua N. Winn,

Jacqueline N. Hewitt,

Paul L. Schechter,

Alan Dressler,

E. Falco,

C. D. Impey,

C. S. Kochanek,

Joseph Lehár,

J. E. J. Lovell,

B. A. McLeod,

N. D. Morgan,

J. A. Muñoz,

HansWalter Rix,

M. T. Ruíz

Publication year - 2000

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/316874

Subject(s) - physics , quasar , astrophysics , gravitational lens , galaxy , redshift , lens (geology) , flux (metallurgy) , sky , extinction (optical mineralogy) , astronomy , optics , chemistry , organic chemistry

We report the discovery of a new double-image quasar that was found during asearch for gravitational lenses in the southern sky. Radio source PMNJ1838-3427 is composed of two flat-spectrum components with separation 1", fluxdensity 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 alsodouble with the same separation and position angle as the radio components. AnHST/WFPC2 image reveals the lens galaxy. The optical flux ratio (27:1) ishigher than the radio value probably due to differential extinction of thecomponents by the lens galaxy. An optical spectrum of the bright componentcontains quasar emission lines at z=2.78 and several absorption features,including prominent Ly-alpha absorption. The lens galaxy redshift could not bemeasured but is estimated to be z=0.36 +/- 0.08. The image configuration isconsistent with the simplest plausible models for the lens potential. The flatradio spectrum and observed variability of PMN J1838-3427 suggest the timedelay between flux variations of the components is measurable, and could thusprovide an independent measurement of H_0.Comment: 23 pages, incl. 6 figures, to appear in A.J.; replaced with accepted version; minor changes to text, improved figure

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