Searching for Gravitational Lenses using the AT20G Survey VLBI Follow up

Details Searching for Gravitational Lenses using the AT20G Survey VLBI Follow up Searching for Gravitational Lenses using the AT20G Survey VLBI Follow up

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2323c&link_type=abstract

ATNF proposal V319, Semester: April, 2009

Mathematics

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Extragalactic, Lba

Scientific paper

Study of the phenomenon of gravitational lensing is now a mature science with evolving implications in astrophysical study of high redshift objects as well as for deriving cosmological parameters (through modeling of the mass distribution, statistics of red shift distribution of lenses etc.). Study of lenses through systematic blind surveys provides an important and independent way of constraining different cosmological parameters through statistical studies. We have embarked upon such a systematic search in the southern hemisphere through the use of data from the Australian Telescope 20 GHz (AT20G) Survey. Our previous 7mm imaging follow-ups have provided us with 13 sources of interest which we intend to follow up on higher resolution using the VLBI method. On this proposal, we request for time to follow-up on the 13 candidates at higher resolution, first to identify candidates for further follow-up by obtaining visibility function for each source over 24 hours. We also request time, depending upon the result of the visibility function study, to make images of up to 2 possible gravitational lenses.

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