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A VLA/Merlin/VLBA For Intermediate Scale Lenses and the Discovery of a New Lens System?

Published online by Cambridge University Press:  25 May 2016

P. Augusto ,
P.N. Wilkinson  and
I.W.A. Browne
P. Augusto
Affiliation:
Nuffield Radio Astronomy Laboratories, Univ. of Manchester Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, U.K.
P.N. Wilkinson
Affiliation:
Nuffield Radio Astronomy Laboratories, Univ. of Manchester Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, U.K.
I.W.A. Browne
Affiliation:
Nuffield Radio Astronomy Laboratories, Univ. of Manchester Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, U.K.

Extract

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We are searching for small lens systems (50-250 mas or 108–109M⊙) in a sample of ∼ 1800 flat spectrum radio sources. This is the first time a systematic search has been made “between” the VLA and VLBI resolutions. Finding any would indicate the existence of other than the “conventional” spiral/elliptical lenses (only ∼ 0.01% chance - Turner et al. (1984)). For example, faint galaxies are numerous (∼ 106 gal/deg2 - Lilly (1993), Glazebrook et al. 1995), compact (HST Medium Deep Survey (MDS) - Griffiths et al. 1994) and ideally placed for lensing (< z >∼ 0.6 - MDS, Smail et al. (1994); c.f. Turner et al. 1984). Early-type dwarf galaxies (dE,N and cE), if extant at intermediate-z as favored by MDS are also obvious lens candidates. If no lenses are found, a limit 400 times better than the current one (Surdej et al. 1993), ΩL < 0.001, will be placed on the cosmological density of compact objects (e.g. black holes) for the above mass range.

Type
Chapter 11: Lens Surveys
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 399 - 400
Copyright
Copyright © Kluwer 1996 

References

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