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The SOAR Gravitational Arc Survey - I: Survey overview and photometric catalogs | | Cristina Furlanetto
; Basilio X. Santiago
; Martin Makler
; Eduardo S. Cypriano
; Gabriel B. Caminha
; Maria Elidaiana da Silva Pereira
; Angelo Fausti Neto
; Juan Estrada
; Huan Lin
; Jiangang Hao
; Timothy A. McKay
; Luiz Nicolaci da Costa
; Marcio A. G. Maia
; | | Date: |
15 Oct 2012 | | Abstract: | We present the first results of the SOAR Gravitational Arc Survey (SOGRAS).
The survey imaged 51 clusters in two narrow redshift intervals centered at
$z=0.27$ and $z=0.55$, targeting the richest clusters in each interval. Images
were obtained in the $g’$, $r’$, and $i’$ bands using the SOAR Optical Imager
(SOI), with a median seeing of 0.82", 0.74", and 0.69", respectively, in these
filters. Most of the survey clusters are located within the Sloan Digital Sky
Survey (SDSS) Stripe 82 region and all of them are in the SDSS footprint.
Photometric calibration was therefore performed using SDSS stars located in our
SOI fields. We reached for galaxies in all fields the detection limits of $g
sim 23$, $r sim 22.5$, and $i sim 22$ for $S/N=3$. As a by-product of the
image processing, we generated a source catalog with 21280 entries, the vast
majority of which are galaxies, where we list their positions, magnitudes, and
shape parameters. We compared our galaxy shape measurements to those of local
galaxies and concluded that they were not strongly affected by seeing. From the
catalog data, we are able to identify a red sequence of galaxies in most
clusters in the lower $z$ range. We found 16 gravitational arc candidates
around 8 clusters in our sample. They tend to be bluer than the central
galaxies in the lensing cluster. A preliminary analysis indicates that $sim
10%$ of the clusters have arcs around them, with a possible indication of a
larger efficiency associated to the high-$z$ systems when compared to the
low-$z$ ones. Deeper follow-up images with Gemini strengthen the case for the
strong lensing nature of the candidates found in this survey. | | Source: | arXiv, 1210.4136 | | Services: | Forum | Review | PDF | Favorites | |
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