2003A&A...409..387R


Query : 2003A&A...409..387R

2003A&A...409..387R - Astronomy and Astrophysics, volume 409, 387-394 (2003/10-1)

Reduction of ringing effects by an improved deconvolution algorithm. Application to A370 CFHT image of gravitational arcs.

ROCHE M., BRACCO C., AIME C., LANTERI H. and MELLIER Y.

Abstract (from CDS):

We develop a self-consistent automatic procedure to restore information from astronomical observations. It relies on both a new deconvolution algorithm called LBCA (Lower Bound Constraint Algorithm) and the use of the Wiener filter. In order to explore its scientific potential for strong and weak gravitational lensing, we process a CFHT image of the galaxy cluster Abell 370 which exhibits spectacular strong gravitational lensing effects. A high quality restoration is here of particular interest to map the dark matter within the cluster. We show that the LBCA is especially efficient to reduce ringing effects introduced by classical deconvolution algorithms in images with a high background. The method allows us to make a blind detection of the radial arc and to recover morphological properties similar to those observed from HST data. We also show that the Wiener filter is suitable to stop the iterative process before noise amplification, using only the unrestored data.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: cluster Abell 370 - cosmology: gravitational lensing - cosmology: dark matter - methods: data analysis - techniques: image processing

CDS comments: In reflist, Mellier A&A.199 : 1998 is a misprint for 1988.

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 683 0
2 [PV91] ACO 370 90 BiC 02 39 52.732 -01 34 18.90   20.40       ~ 23 0
3 SDSS J023953.12-013455.9 GiC 02 39 53.126 -01 34 55.98   20.93       ~ 24 0
4 BOW ACO 370 CC049 GiC 02 39 53.7 -01 35 03   21.51       ~ 8 0
5 SMFC 62 GiC ~ ~           ~ 4 0
6 [SDK96] A370 R LeI ~ ~           ~ 7 0

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2022.05.21-13:36:10

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