Open AccessThe Redshift of a Lensing Galaxy in PMN J0134−0931
Author(s) -
Patrick B. Hall,
Gordon T. Richards,
Donald G. York,
Charles R. Keeton,
David V. Bowen,
Donald P. Schneider,
David J. Schlegel,
J. Brinkmann
Publication year - 2002
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/342784
Subject(s) - physics , astrophysics , quasar , redshift , galaxy , sky , astronomy , hubble space telescope , weak gravitational lensing
The Sloan Digital Sky Survey (SDSS) automatically targeted as a quasarcandidate the recently discovered, gravitationally lensed, extremely reddenedz=2.2 quasar PMN J0134-0931. The SDSS spectrum exhibits Ca II absorption atz=0.76451, which we identify as the redshift of a lensing galaxy. Hubble SpaceTelescope imaging shows that components CDE of the system are significantlyredder than components A or B and detects faint galaxy emission between D andA+B. The redshift of the dust responsible for the reddening remainsunconstrained with current data. However, we outline a model wherein lensingand differential reddening by a z=0.76451 galaxy pair can entirely explain thissystem. Detecting mm-wave molecular line absorption from the lensing galaxy orgalaxies may be possible in PMN J0134-0931, just as in the lenses PKS1830-211and B0218+357. Well-constructed optical quasar surveys like the SDSS cancontribute to the detection and study of reddened quasars. (Expanded)
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