The 2dF gravitational lens survey

Daniel J. Mortlock, Darren S. Madgwick, Ofer Lahav, PASA, 18 (2), in press.
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Contents Page: Volume 18, Number 2

The 2dF gravitational lens survey

Daniel J. Mortlock1,2
Darren S. Madgwick1
Ofer Lahav1

1 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, United Kingdom,,

2 Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, United Kingdom


The 2 degree Field (2dF) galaxy redshift survey will involve obtaining spectra of approximately

2.5 x 105 objects which have previously been identified as galaxy candidates on morphological grounds. Included in these spectra should be about ten gravitationally-lensed quasars, all with low-redshift galaxies as deflectors (as the more common lenses with high-redshift deflectors will be rejected from the survey as multiple point-sources). The lenses will appear as superpositions of galaxy and quasar spectra, and either cross-correlation techniques or principal components analysis should be able to identify candidates systematically. With the 2dF survey approximately half-completed it is now viable to begin a methodical search for these spectroscopic lenses, and the first steps of this project are described here.

Keywords: surveys - gravitational lensing - methods: data analysis

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