2013A&A...549A..80F


Query : 2013A&A...549A..80F

2013A&A...549A..80F - Astronomy and Astrophysics, volume 549A, 80-80 (2013/1-1)

A simple prescription for simulating and characterizing gravitational arcs.

FURLANETTO C., SANTIAGO B.X., MAKLER M., DE BOM C., BRANDT C.H., NETO A.F., FERREIRA P.C., DA COSTA L.N. and MAIA M.A.G.

Abstract (from CDS):

Simple models of gravitational arcs are crucial for simulating large samples of these objects with full control of the input parameters. These models also provide approximate and automated estimates of the shape and structure of the arcs, which are necessary for detecting and characterizing these objects on massive wide-area imaging surveys. We here present and explore the ArcEllipse, a simple prescription for creating objects with a shape similar to gravitational arcs. We also present PaintArcs, which is a code that couples this geometrical form with a brightness distribution and adds the resulting object to images. Finally, we introduce ArcFitting, which is a tool that fits ArcEllipses to images of real gravitational arcs. We validate this fitting technique using simulated arcs and apply it to CFHTLS and HST images of tangential arcs around clusters of galaxies. Our simple ArcEllipse model for the arc, associated to a Sersic profile for the source, recovers the total signal in real images typically within 10%-30%. The ArcEllipse+Sersic models also automatically recover visual estimates of length-to-width ratios of real arcs. Residual maps between data and model images reveal the incidence of arc substructure. They may thus be used as a diagnostic for arcs formed by the merging of multiple images. The incidence of these substructures is the main factor that prevents ArcEllipse models from accurately describing real lensed systems.

Abstract Copyright:

Journal keyword(s): gravitational lensing: strong - methods: analytical

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 68 ClG 00 37 06.2 +09 09 33           ~ 168 0
2 SL2S J021416-050315 gLe 02 14 16.579 -05 03 15.51           ~ 3 0
3 SL2S J021807-051536 G 02 18 07.290 -05 15 36.16           ~ 6 0
4 ACO 383 ClG 02 48 06.9 -03 29 32           ~ 314 0
5 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1403 0
6 GAMA 3882191 G 08 54 46.550 -01 21 37.08           ~ 16 0
7 ACO 963 ClG 10 17 09.6 +39 01 00           ~ 365 0
8 SL2S J141912+532612 G 14 19 12.170 +53 26 11.44           ~ 6 0
9 SL2S J142258+512440 gLe 14 22 58.340 +51 24 39.50           ~ 3 0
10 [LCG2009] SL2S Group J14300+5546 GrG 14 30 00.660 +55 46 47.87           ~ 7 0
11 [LCG2009] SL2S Group J14314+5533 GrG 14 31 39.744 +55 33 22.71           ~ 6 0
12 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 785 1
13 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 331 0

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2021.10.24-02:34:10

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