2004ApJ...600L.159P

Query : 2004ApJ...600L.159P

2004ApJ...600L.159P - Astrophys. J., 600, L159-L162 (2004/January-2)

Optimal galaxy shape measurements for weak lensing applications using the Hubble Space Telescope Advanced Camera for Surveys.

PARK Y., CASERTANO S. and FERGUSON H.C.

Abstract (from CDS):

We present three-epoch multiband (V606, i775, and z850) measurements of galaxy shapes using the ``polar shapelet'' or Laguerre expansions method with the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) data, obtained as part of the Great Observatories Origin Deep Survey (GOODS). We take advantage of the unique features of the GOODS/ACS fields to test the reliability of this relatively new method of galaxy shape measurement for weak lensing analysis and to quantify the impact of the ACS point-spread function (PSF) on HST/ACS data. We estimate the bias introduced by the sharp PSF of the ACS on shape measurement. We show that the bias in the tangential shear due to galaxy-galaxy lensing can be safely neglected provided that only well-resolved galaxies are used, while it would be comparable to the signal level (1%-3%) for cosmic shear measurements. These results should be of general utility in planning and analyzing weak lensing measurements with HST/ACS data.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Dark Matter - Galaxies: Halos - Cosmology: Gravitational Lensing - Cosmology: Large-Scale Structure of Universe - Methods: Data Analysis

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 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1

Query : 2004ApJ...600L.159P

Basic data :
NAME Chandra Deep Field-South -- Region defined in the Sky
Other object types: otypes_help 		reg ()
ICRS coord. (ep=J2000) : 		03 32 28.0 -27 48 30 [ ] D 2001ApJ...551..624G
FK4 coord. (ep=B1950 eq=1950) : 		03 30 22.4 -27 58 35 [ ]
Gal coord. (ep=J2000) : 		223.5732 -54.4374 [ ]
Angular size (arcmin): 		15.84 15.84 ~ (~) D ~
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Identifiers (4) :
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NAME Chandra Deep Field-South NAME CDFS NAME CDF-S NAME Chandra Deep Field South

References (2282 between 1850 and 2026) (Total 2282)
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