J/ApJS/232/15 Candidate strong lens systems from DES obs. (Diehl+, 2017)
The DES Bright Arcs Survey: hundreds of candidate strongly lensed galaxy systems from the Dark Energy Survey Science Verification and Year 1 observations. Diehl H.T., Buckley-Geer E.J., Lindgren K.A., Nord B., Gaitsch H., Gaitsch S., Lin H., Allam S., Collett T.E., Furlanetto C., Gill M.S.S., More A., Nightingale J., Odden C., Pellico A., Tucker D.L., da Costa L.N., Neto A.F., Kuropatkin N., Soares-Santos M., Welch B., Zhang Y., Frieman J.A., Abdalla F.B., Annis J., Benoit-Levy A., Bertin E., Brooks D., Burke D.L., Rosell A.C., Kind M.C., Carretero J., Cunha C.E., D'Andrea C.B., Desai S., Dietrich J.P., Drlica-Wagner A., Evrard A.E., Finley D.A., Flaugher B., Garcia-Bellido J., Gerdes D.W., Goldstein D.A., Gruen D., Gruendl R.A., Gschwend J., Gutierrez G., James D.J., Kuehn K., Kuhlmann S., Lahav O., Li T.S., Lima M., Maia M.A.G., Marshall J.L., Menanteau F., Miquel R., Nichol R.C., Nugent P., Ogando R.L.C., Plazas A.A., Reil K., Romer A.K., Sako M., Sanchez E., Santiago B., Scarpine V., Schindler R., Schubnell M., Sevilla-Noarbe I., Sheldon E., Smith M., Sobreira F., Suchyta E., Swanson M.E.C., Tarle G., Thomas D., Walker A.R., (the DES Collaboration) <Astrophys. J. Suppl. Ser., 232, 15-15 (2017)> =2017ApJS..232...15D (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Galaxies, photometry ; Redshifts ; Surveys Keywords: galaxies: high-redshift; gravitational lensing: strong Abstract: We report the results of searches for strong gravitational lens systems in the Dark Energy Survey (DES) Science Verification and Year1 observations. The Science Verification data span approximately 250°2 with a median i-band limiting magnitude for extended objects (10σ) of 23.0. The Year 1 data span approximately 2000°2 and have an i-band limiting magnitude for extended objects (10σ) of 22.9. As these data sets are both wide and deep, they are particularly useful for identifying strong gravitational lens candidates. Potential strong gravitational lens candidate systems were initially identified based on a color and magnitude selection in the DES object catalogs or because the system is at the location of a previously identified galaxy cluster. Cutout images of potential candidates were then visually scanned using an object viewer and numerically ranked according to whether or not we judged them to be likely strong gravitational lens systems. Having scanned nearly 400000 cutouts, we present 374 candidate strong lens systems, of which 348 are identified for the first time. We provide the R.A. and decl., the magnitudes and photometric properties of the lens and source objects, and the distance (radius) of the source(s) from the lens center for each system. Description: The Dark Energy Survey (DES) is in the midst of imaging 5000°2 of the southern galactic cap using the Dark Energy Camera (DECam), which is operated on the 4m Victor M. Blanco Telescope at Cerro Tololo Interamerican Observatory (CTIO) near La Serena, Chile. Science verification (SV) spanned 79 nights or half-nights from 2012 November 1, to 2013 February 22. The main SV wide-field (WF) survey areas amounted to ∼250°2 at non-uniform depth and data quality. The first full observing season, Year 1 (Y1), spanned 119 nights or half-nights from 2013 August 31 to 2014 February 9. The Y1 wide-field (WF) survey observations were concentrated in two areas: one of about 150°2 near the celestial equator that included a part of SDSS Stripe 82 (Annis+ 2014ApJ...794..120A), and a much larger region of roughly 1800°2 from -60° to -40° decl. that overlapped the area mapped in microwaves by the South Pole Telescope (SPT). Generally, we observed those fields four times in each of the five filters: the g, r, i, z, and Y-bands. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 89 376 Properties of candidate lensing systems table3.dat 104 1091 *Names, positions, photometry, and photometric redshifts of objects for each candidate lensing system
Note on table3.dat: The data were processed by the Dark Energy Survey Data Management (DESDM) system (Mohr+ 2012SPIE.8451E..0DM ; R. Gruendl+ 2017, in preparation) in three pipelined stages: single-epoch "detrending", photometric calibration, and coaddition. See section 2 for further explanations.
See also: J/ApJS/176/19 : COSMOS: strong lens systems (Faure+, 2008) J/ApJS/191/340 : Southern Cosmology Survey. II. (Menanteau+, 2010) J/ApJS/193/8 : Spectroscopy of 26 lensing cluster cores (Bayliss+, 2011) J/ApJ/742/48 : Blanco survey of the lens BCS J2352-5452 (Buckley-Geer+, 2011) J/ApJ/749/38 : CFHTLS-SL2S-ARCS strong lens candidates (More+, 2012) J/ApJ/761/22 : NIR galaxy cluster candidates in the SPT survey (Song+, 2012) J/ApJ/763/127 : Galaxy clusters discovered in SPT survey (Reichardt+, 2013) J/ApJ/785/144 : SL2S galaxy-scale sample of lens candidates (Gavazzi+, 2014) J/ApJS/216/27 : Galaxy clusters discovered in the SPT-SZ survey (Bleem+, 2015) J/A+A/592/A75 : New lens candidates in CFHTLS (Paraficz+, 2016) J/ApJ/816/98 : Galaxies in X-ray clusters with DES. I. (Zhang+, 2016) http://admin.masterlens.org/index.php : Master Lens Database Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [DES] 4- 13 A10 --- DES System identifier (JHHMM+DDMM) ordered by increasing RA 15- 37 A23 --- Al Algorithm(s) that detected the system (1) 39- 40 I2 --- Rank [3/10]? Visual inspection rank (3=lowest to 10=definite strong lens system) 42- 46 F5.2 arcsec Rad [1.3/35] Average radius 48- 51 F4.2 arcsec e_Rad [0.2/9] Uncertainty in Rad 53- 56 A4 --- Mult Source objects that are multiply imaged 58- 81 A24 --- OName Reference to detections in other paper(s) (2) 83- 89 A7 --- r_OName Reference(s) for other detection (3)
Note (1): Algorithm as follows: BNA = "Blue Near Anything" (BNA) 2+ (section 3.2); 1K = "Blue Near Anything" (BNA) 1K (section 3.2); RedM = redMaPPer clusters and redMaGiC galaxies (section 3.3); SPT = South Pole Telescope (SPT) clusters (section 3.1; see Bleem+, 2015, J/ApJS/216/27); RNA = Red Near Anything (section 3.4). Note (2): The names match those which label the system images in the panels in Fig. 6 to Fig. 16. Note (3): Reference as follows: a = Bleem et al. (2015, J/ApJS/216/27), b = Nord et al. (2017, in preparation), c = Menanteau et al. (2012ApJ...748....7M), d = Zitrin et al. (2013ApJ...770L..15Z), e = Stark et al. (2013MNRAS.436.1040S), f = Moustakas & Brownstein (2017, in preparation), g = Menanteau et al. (2010ApJ...723.1523M), h = Nord et al. (2016ApJ...827...51N), i = Lin et al. (2017ApJ...838L..15L), j = Staniszewski et al. (2009ApJ...701...32S), k = Mehlert et al. (2001A&A...379...96M), l = Song et al. (2012, J/ApJ/761/22), m = Collett et al. (2017ApJ...843..148C), n = Bayliss et al. (2011, J/ApJS/193/8), o = Hennawi et al. (2008AJ....135..664H), p = More et al. (2012MNRAS.455.1191M), q = Sonnenfeld et al. (2017arXiv170401585S), r = Gomez et al. (2012AJ....144...79G), s = Greve et al. (2012ApJ...756..101G), t = Aravena et al. (2013MNRAS.433..498A), u = Menanteau et al. (2010ApJS..191..349M), v = Buckley-Geer et al. (2011, J/ApJ/742/48).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [DES] 4- 13 A10 --- DES System identifier (JHHMM+DDMM) (1) 15 A1 --- --- [(] 16 A1 --- m_DES Lens (if letter) or source (if number) within the respective cutouts 17 A1 --- --- [)] 19- 28 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 30- 39 F10.6 deg DEdeg Declination in decimal degrees (J2000) 41- 45 F5.2 mag gmag [16.5/27.1]? DESDM database g band magnitude 47- 50 F4.2 mag e_gmag [0/1]? Uncertainty in gmag 52- 56 F5.2 mag rmag [15.6/24.4]? DESDM database r band magnitude 58- 61 F4.2 mag e_rmag [0/0.4]? Uncertainty in rmag 63- 67 F5.2 mag imag [15.2/24.2]? DESDM database i band magnitude 69- 72 F4.2 mag e_imag [0/0.4]? Uncertainty in imag 74- 78 F5.2 mag zmag [14.9/24]? DESDM database z band magnitude 80- 83 F4.2 mag e_zmag [0/0.9]? Uncertainty in zmag 85- 89 F5.2 mag Ymag [14.9/27]? DESDM database Y band magnitude (2) 91- 94 F4.2 mag e_Ymag [0/1]? Uncertainty in Ymag 96- 99 F4.2 --- zphot [0.06/2]? Photometric redshift 101-104 F4.2 --- e_zphot [0.02/0.3]? Uncertainty in zphot (3)
Note (1): System Name refers to the arc or lensed source image as shown in Table 2 and in Figs. 6 to 16. Note (2): Y-band photometry is provided where available: supernova fields were only observed in Y-band for those fields that overlap with the wide-field survey. Note (3): The redshift uncertainties have been multiplied by 1.5 times the original estimate, according to the results of Sanchez+ (2014MNRAS.445.1482S) for estimating uncertainties calculated using DES photometric redshift measurement codes.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Oct-2017
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