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Title: The SOAR Gravitational Arc Survey – I. Survey overview and photometric catalogues

Abstract

We present the first results of the SOAR (Southern Astrophysical Research) Gravitational Arc Survey (SOGRAS). The survey imaged 47 clusters in two 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 0.83, 0.76 and 0.71 arcsec, 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 $$g \sim 23.5$$, $$r \sim 23$$ and $$i \sim 22.5$$ for a signal-to-noise ratio (S/N) = 3. As a by-product of the image processing, we generated a source catalogue with 19760 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 catalogue data, we are able to identify a red sequence of galaxies inmore » 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.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1406504
Report Number(s):
arXiv:1210.4136; FERMILAB-PUB-13-247-AE-CD-PPD
Journal ID: ISSN 0035-8711; 1190644
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 432; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Furlanetto, Cristina, Santiago, Basílio X., Makler, Martín, Cypriano, Eduardo S., Caminha, Gabriel B., Pereira, Maria E. S., Neto, Angelo Fausti, Estrada, Juan, Lin, Huan, Hao, Jiangang, McKay, Timothy A., da Costa, Luiz N., and Maia, Marcio A. G. The SOAR Gravitational Arc Survey – I. Survey overview and photometric catalogues. United States: N. p., 2013. Web. doi:10.1093/mnras/stt380.
Furlanetto, Cristina, Santiago, Basílio X., Makler, Martín, Cypriano, Eduardo S., Caminha, Gabriel B., Pereira, Maria E. S., Neto, Angelo Fausti, Estrada, Juan, Lin, Huan, Hao, Jiangang, McKay, Timothy A., da Costa, Luiz N., & Maia, Marcio A. G. The SOAR Gravitational Arc Survey – I. Survey overview and photometric catalogues. United States. https://doi.org/10.1093/mnras/stt380
Furlanetto, Cristina, Santiago, Basílio X., Makler, Martín, Cypriano, Eduardo S., Caminha, Gabriel B., Pereira, Maria E. S., Neto, Angelo Fausti, Estrada, Juan, Lin, Huan, Hao, Jiangang, McKay, Timothy A., da Costa, Luiz N., and Maia, Marcio A. G. Thu . "The SOAR Gravitational Arc Survey – I. Survey overview and photometric catalogues". United States. https://doi.org/10.1093/mnras/stt380. https://www.osti.gov/servlets/purl/1406504.
@article{osti_1406504,
title = {The SOAR Gravitational Arc Survey – I. Survey overview and photometric catalogues},
author = {Furlanetto, Cristina and Santiago, Basílio X. and Makler, Martín and Cypriano, Eduardo S. and Caminha, Gabriel B. and Pereira, Maria E. S. and Neto, Angelo Fausti and Estrada, Juan and Lin, Huan and Hao, Jiangang and McKay, Timothy A. and da Costa, Luiz N. and Maia, Marcio A. G.},
abstractNote = {We present the first results of the SOAR (Southern Astrophysical Research) Gravitational Arc Survey (SOGRAS). The survey imaged 47 clusters in two 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 0.83, 0.76 and 0.71 arcsec, 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 $g \sim 23.5$, $r \sim 23$ and $i \sim 22.5$ for a signal-to-noise ratio (S/N) = 3. As a by-product of the image processing, we generated a source catalogue with 19760 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 catalogue 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.},
doi = {10.1093/mnras/stt380},
url = {https://www.osti.gov/biblio/1406504}, journal = {Monthly Notices of the Royal Astronomical Society},
issn = {0035-8711},
number = 1,
volume = 432,
place = {United States},
year = {2013},
month = {4}
}