2002ApJ...564...65G

Query : 2002ApJ...564...65G

2002ApJ...564...65G - Astrophys. J., 564, 65-72 (2002/January-1)

The galaxy octopole moment as a probe of weak-lensing shear fields.

GOLDBERG D.M. and NATARAJAN P.

Abstract (from CDS):

In this paper, we introduce the octopole moment of the light distribution in galaxies as a probe of the weak-lensing shear field. While traditional ellipticity estimates of the local shear derived from the quadrupole moment are limited by the width of the intrinsic ellipticity distribution of background galaxies, the dispersion in the intrinsic octopole distribution is expected to be much smaller, implying that the signal from this higher order moment is ultimately limited by measurement noise, and not by intrinsic scatter. We present the computation of the octopole moment and show that current observations are at the regime in which the octopole estimates will soon be able to contribute to the overall accuracy of the estimates of local shear fields. Therefore, the prospects for this estimator from future data sets such as the Advanced Camera for Survey and the Next Generation Space Telescope are very promising.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Dark Matter - Cosmology: Gravitational Lensing

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	ACO S 1077	ClG	22 58 52.34	-34 46 54.6						~	198	0

Query : 2002ApJ...564...65G

Basic data :

ACO S 1077 -- Cluster of Galaxies
Other object types:	`ClG (2019A&A,ACO,...)`, `C?G (2014A&A)`, `gLe (2001ApJ)`
ICRS coord. (ep=J2000) :	`22 58 52.34 -34 46 54.6 [ ] E 2002MNRAS.329...87D`
FK4 coord. (ep=B1950 eq=1950) :	`22 56 06.00 -35 03 00.0 [ ]`
Gal coord. (ep=J2000) :	`008.31974 -64.78026 [ ]`
Radial velocity / Redshift / cz :	`V(km/s) 79466 [~] / z(~) 0.312000 [~] / cz 93535.25 [~] D 1989ApJS...70....1A`

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`ACO S 1077`	`BAX 344.7181-34.7818`	`PSZ2 G008.31-64.74`
`ACCG 114`	`PSZ1 G008.33-64.74`	`PSZRX G008.33-64.76`

References (198 between 1850 and 2026) (Total 198)
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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ACO S 1077

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