1998A&A...333L..79D

Query : 1998A&A...333L..79D

1998A&A...333L..79D - Astronomy and Astrophysics, volume 333L79-82 (1998/5-3)

A robust and efficient method for calculating the magnification of extended sources caused by gravitational lenses.

DOMINIK M.

Abstract (from CDS):

To determine the magnification of an extended source caused by gravitational lensing one has to perform a two-dimensional integral over point-source magnifications in general. Since the point-source magnification jumps to an infinite value on caustics, special care is required. For a uniformly bright source, it has been shown earlier that the calculation simplifies if one determines the magnification from the area of the images of the extended source by applying Green's theorem so that one ends up with a one-dimensional integration over the image boundaries. This approach is discussed here in detail, and it is shown that it can be used to yield a robust and efficient method also for limb-darkened sources. It is also shown that the centroid shift can be calculated in a similar way.

Abstract Copyright: ∼

Journal keyword(s): methods: numerical - gravitational lensing - planetary systems - binaries: general - dark matter

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MACHO 97-BLG-28 * 18 00 33.9 -28 01 10     18.1     ~ 31 0

Query : 1998A&A...333L..79D

Basic data :
MACHO 97-BLG-28 -- Star
Other object types: otypes_help 		* (MACHO), Lev (MACHO)
ICRS coord. (ep=J2000) : 		18 00 33.9 -28 01 10 [ ] D ~
FK4 coord. (ep=B1950 eq=1950) : 		17 57 24.6 -28 01 06 [ ]
Gal coord. (ep=J2000) : 		002.4582 -02.3634 [ ]
Fluxes (1) :
V 18.1 [~] E ~
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Identifiers (2) :
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MACHO 97-BLG-28 MACHO 108.18951.593

References (31 between 1850 and 2026) (Total 31)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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MACHO 97-BLG-28 MACHO 108.18951.593

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