The gravitational lens as an astronomical diagnostic

Saslaw, W. C. ; Narasimha, D. ; Chitre, S. M. (1985) The gravitational lens as an astronomical diagnostic Astrophysical Journal, 292 . pp. 348-356. ISSN 0004-637X

PDF - Publisher Version

Official URL:

Related URL:


How a point gravitational lens images a diffuse background source is examined, and it is shown that under a wide range of circumstances the image contains a 'gravity ring.' The chief criterion for producing this phenomenon is that the angular scale of brightness variation in the source be smaller than the angular radius of the cone of inversion of the image. The observation of gravity rings, which should soon become resolvable with very long baseline radio interferometry, would provide a useful astronomical diagnostic. It would give an independent (or unique) estimate of fundamental quantities such as the mass or distance of the deflector star and the distance of the source. A variety of astronomical examples, such as nebulae and pulsars, where the phenomenon may be especially useful is described.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
Keywords:Gravitational Lenses; Imaging Techniques; Pulsars; Radio Astronomy; very Long Base Interferometry; Angular Distribution; Brightness Distribution; Diffuse Radiation; Isophotes; Point Sources
ID Code:5823
Deposited On:19 Oct 2010 10:49
Last Modified:16 May 2016 16:16

Repository Staff Only: item control page