2010A&A...517A..25S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST11:26:59

2010A&A...517A..25S - Astronomy and Astrophysics, volume 517, A25-25 (2010/7-1)

A search for edge-on galaxy lenses in the CFHT legacy survey.

SYGNET J.F., TU H., FORT B. and GAVAZZI R.

Abstract (from CDS):

The new generation of wide-field optical imaging as the Canada France Hawaii Telescope Legacy Survey (CFHTLS) enables discoveries of all types of gravitational lenses present in the sky. The Strong Lensing Legacy Survey (SL2S) project has started an inventory of clusters or groups of galaxies lenses and of Einstein rings around distant massive ellipticals. Here we attempt to extend this inventory by finding lensing events produced by massive edge-on disk galaxies that remain a poorly documented class of lenses. We implemented and tested an automated search procedure of edge-on galaxy lenses in the CFHTLS Wide fields with magnitude 18<i<21, inclination angle lower than 25°, and a photometric redshift determination. This procedure estimated the lensing convergence of each galaxy from the Tully-Fisher law and selected only those few candidates that exhibit a possibly nearby arc configuration at a radius compatible with this convergence (rarc≲2rE). The efficiency of the procedure was tested after a visual examination of the whole initial sample of 30444 individual edge-on disks. After calculating the surface density of edge-on lenses possibly detected in a survey for a given seeing, we deduce that this theoretical number is about 10 for the CFHTLS Wide, a number in broad agreement with the 2 good candidates detected here. We show that the Tully-Fisher selection method is very efficient at finding valuable candidates, though its accuracy depends on the quality of the photometric redshift of the lenses. Finally, we argue that future surveys will detect at least a hundred of such lens candidates.

Abstract Copyright:

Journal keyword(s): gravitational lensing: strong - dark matter - galaxies: spiral - galaxies: halos

Nomenclature: Fig. 4, Table 1: SL2S JHHMMSS+DDMMSS N=16 added.

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0045-3337 * 00 47 41.90 -33 20 55.0     17.80     ~ 5 1
2 SL2S J020933-054012 gLe 02 09 33.633 -05 40 12.99           ~ 1 0
3 SL2S J021243-055203 gLe 02 12 43.801 -05 52 03.23           ~ 1 0
4 SL2S J021523-043932 G 02 15 23.815 -04 39 32.26           ~ 2 0
5 SL2S J021711-042542 G 02 17 11.843 -04 25 42.00           ~ 2 0
6 SL2S J021817-061442 gLe 02 18 17.050 -06 14 42.59           ~ 1 0
7 SL2S J022533-042414 gLe 02 25 33.129 -04 24 14.99           ~ 1 0
8 SL2S J022608-091714 gLe 02 26 08.138 -09 17 14.87           ~ 1 0
9 SL2S J085014-030156 gLe 08 50 14.572 -03 01 56.08           ~ 1 0
10 SL2S J085111-025954 gLe 08 51 11.743 -02 59 54.21           ~ 1 0
11 SL2S J095907+020450 G 09 59 07.77 +02 04 50.2 23.232 22.67 22.16 22.10 21.901 ~ 3 0
12 OACDF J122332.7-123940 G 12 23 32.652 -12 39 40.47           ~ 4 0
13 SL2S J140123+512211 gLe 14 01 23.392 +51 22 11.00           ~ 1 0
14 SL2S J140454+544552 gLe 14 04 54.217 +54 45 52.49           ~ 1 0
15 SL2S J141200+531939 gLe 14 12 00.934 +53 19 39.83           ~ 1 0
16 SL2S J141336+562849 gLe 14 13 36.001 +56 28 49.25           ~ 1 0
17 SL2S J141423+522237 gLe 14 14 23.150 +52 22 37.46           ~ 1 0
18 SL2S J141632+523455 gLe 14 16 32.336 +52 34 55.14           ~ 1 0
19 QSO B1600+4344 QSO 16 01 40.4818 +43 16 47.394   22.12 21.92     ~ 176 1
20 PMN J2004-1349 QSO 20 04 07.09 -13 49 31.1           ~ 22 1
21 [VV2006] J220132.9-320143 QSO 22 01 32.9 -32 01 43     21.93   19.94 ~ 14 1
22 QSO J2240+0321 QSO 22 40 30.234 +03 21 30.63           ~ 638 0
23 Z 378-15 G 22 40 30.23447 +03 21 30.6290           ~ 629 0

    Equat.    Gal    SGal    Ecl

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2020.07.11-11:26:59

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