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2007MNRAS.374.1427S - Mon. Not. R. Astron. Soc., 374, 1427-1436 (2007/February-1)
The Milky Way Galaxy as a strong gravitational lens.
SHIN E.M. and EVANS N.W.
Abstract (from CDS):
The Milky Way model has a maximum disc (i.e. the halo is not dynamically important in the inner parts). Strong lensing by nearly edge-on disc galaxies breaks the degeneracy between the relative contributions of the disc and halo to the overall rotation curve. If a spiral galaxy has a submaximum disc, then the astroid caustic shrinks dramatically in size, whilst the radial caustic shrinks more modestly. This causes changes in the relative likelihood of the image geometries, specifically (i) core triplets are now ∼9/2 times more likely than disc triplets, (ii) the cross-section for threefold imaging is reduced by a factor of ∼2/3, whilst (iii) the cross-section for fivefold imaging is reduced by ∼1/2. Although multiple imaging is less likely (the cross-sections are smaller), the average total magnification is greater. The time delays are smaller, as the total projected lensing mass is reduced.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): gravitational lensing - Galaxy: bulge - Galaxy: disc - Galaxy: halo - Galaxy: structure
Simbad objects: 9
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