2015MNRAS.454.1260A

Query : 2015MNRAS.454.1260A

2015MNRAS.454.1260A - Mon. Not. R. Astron. Soc., 454, 1260-1265 (2015/December-1)

Discovery of two gravitationally lensed quasars in the Dark Energy Survey.

AGNELLO A., TREU T., OSTROVSKI F., SCHECHTER P.L., BUCKLEY-GEER E.J., LIN H., AUGER M.W., COURBIN F., FASSNACHT C.D., FRIEMAN J., KUROPATKIN N., MARSHALL P.J., McMAHON R.G., MEYLAN G., MORE A., SUYU S.H., RUSU C.E., FINLEY D., ABBOTT T., ABDALLA F.B., ALLAM S., ANNIS J., BANERJI M., BENOIT-LEVY A., BERTIN E., BROOKS D., BURKE D.L., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CUNHA C.E., D'ANDREA C.B., DA COSTA L.N., DESAI S., DIEHL H.T., DIETRICH J.P., DOEL P., EIFLER T.F., ESTRADA J., NETO A.F., FLAUGHER B., FOSALBA P., GERDES D.W., GRUEN D., GUTIERREZ G., HONSCHEID K., JAMES D.J., KUEHN K., LAHAV O., LIMA M., MAIA M.A.G., MARCH M., MARSHALL J.L., MARTINI P., MELCHIOR P., MILLER C.J., MIQUEL R., NICHOL R.C., OGANDO R., PLAZAS A.A., REIL K., ROMER A.K., ROODMAN A., SAKO M., SANCHEZ E., SANTIAGO B., SCARPINE V., SCHUBNELL M., SEVILLA-NOARBE I., SMITH R.C., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., THALER J., TUCKER D., WALKER A.R., WECHSLER R.H. and ZHANG Y.

Abstract (from CDS):

We present spectroscopic confirmation of two new gravitationally lensed quasars, discovered in the Dark Energy Survey (DES) and Wide-field Infrared Survey Explorer (WISE) based on their multiband photometry and extended morphology in DES images. Images of DES J0115-5244 show a red galaxy with two blue point sources at either side, which are images of the same quasar at zs = 1.64 as obtained by our long-slit spectroscopic data. The Einstein radius estimated from the DES images is 0.51arcsec. DES J2146-0047 is in the area of overlap between DES and the Sloan Digital Sky Survey (SDSS). Two blue components are visible in the DES and SDSS images. The SDSS fibre spectrum shows a quasar component at zs = 2.38 and absorption by Mg II and Fe II at zl = 0.799, which we tentatively associate with the foreground lens galaxy. Our long-slit spectra show that the blue components are resolved images of the same quasar. The Einstein radius is 0.68arcsec, corresponding to an enclosed mass of 1.6x1011M☉. Three other candidates were observed and rejected, two being low-redshift pairs of starburst galaxies, and one being a quasar behind a blue star. These first confirmation results provide an important empirical validation of the data mining and model-based selection that is being applied to the entire DES data set.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): gravitational lensing: strong - methods: observational - methods: statistical - quasars: emission lines

Nomenclature: Fig. 1, Table 1: [ATO2015] DES JHHMM+DDMM N=2, [ATO2015] DES JHHMM+DDMM source N=2, [ATO2015] DES JHHMM+DDMM A N=3+3. Paragr. 3.3: [ATO2015] JHHMMSS.s+DDMMSS N=2.

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 - 2026 		#notes
1 [ATO2015] DES J0115-5244 source QSO 01 15 57.320 -52 44 23.20           ~ 1 0
2 [ATO2015] DES J0115-5244 gLS 01 15 57.320 -52 44 23.20           ~ 2 0
3 [ATO2015] DES J0115-5244 A LeQ 01 15 57.320 -52 44 23.20           ~ 1 0
4 [ATO2015] DES J0115-5244 B LeQ 01 15 57.360 -52 44 22.23           ~ 1 0
5 [ATO2015] DES J0115-5244 G G 01 15 57.400 -52 44 22.98           ~ 1 0
6 [ATO2015] J205356.5-560936 PaG 20 53 56.5 -56 09 36           ~ 1 0
7 [ATO2015] DES J2146-0047 B LeQ 21 46 46.03 -00 47 45.7           ~ 1 0
8 [ATO2015] DES J2146-0047 gLS 21 46 46.04 -00 47 44.3           ~ 2 0
9 [ATO2015] DES J2146-0047 A LeQ 21 46 46.04 -00 47 44.3           ~ 1 0
10 SDSS J214646.04-004744.2 QSO 21 46 46.0419309408 -00 47 44.293495056           ~ 5 0
11 [ATO2015] DES J2146-0047 G G 21 46 46.05 -00 47 45.0           ~ 1 0
12 SDSS J220024.09+011037.5 QSO 22 00 24.0963897336 +01 10 37.512297120           ~ 1 1
13 [ATO2015] J221752.5-535715 PaG 22 17 52.5 -53 57 15           ~ 1 0

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