2020MNRAS.498.3241B

Query : 2020MNRAS.498.3241B

2020MNRAS.498.3241B - Mon. Not. R. Astron. Soc., 498, 3241-3274 (2020/November-1)

STRIDES: Spectroscopic and photometric characterization of the environment and effects of mass along the line of sight to the gravitational lenses DES J0408-5354 and WGD 2038-4008.

BUCKLEY-GEER E.J., LIN H., RUSU C.E., POH J., PALMESE A., AGNELLO A., CHRISTENSEN L., FRIEMAN J., SHAJIB A.J., TREU T., COLLETT T., BIRRER S., ANGUITA T., FASSNACHT C.D., MEYLAN G., MUKHERJEE S., WONG K.C., AGUENA M., ALLAM S., AVILA S., BERTIN E., BHARGAVA S., BROOKS D., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CASTANDER F.J., COSTANZI M., DA COSTA L.N., DE VICENTE J., DESAI S., DIEHL H.T., DOEL P., EIFLER T.F., EVERETT S., FLAUGHER B., FOSALBA P., GARCIA-BELLIDO J., GAZTANAGA E., GRUEN D., GRUENDL R.A., GSCHWEND J., GUTIERREZ G., HINTON S.R., HONSCHEID K., JAMES D.J., KUEHN K., KUROPATKIN N., MAIA M.A.G., MARSHALL J.L., MELCHIOR P., MENANTEAU F., MIQUEL R., OGANDO R.L.C., PAZ-CHINCHON F., PLAZAS A.A., SANCHEZ E., SCARPINE V., SCHUBNELL M., SERRANO S., SEVILLA-NOARBE I., SMITH M., SOARES-SANTOS M., SUCHYTA E., SWANSON M.E.C., TARLE G., TUCKER D.L., VARGA T.N. (The DES Collaboration)

Abstract (from CDS):

In time-delay cosmography, three of the key ingredients are (1) determining the velocity dispersion of the lensing galaxy, (2) identifying galaxies and groups along the line of sight with sufficient proximity and mass to be included in the mass model, and (3) estimating the external convergence κext from less massive structures that are not included in the mass model. We present results on all three of these ingredients for two time-delay lensed quad quasar systems, DES J0408-5354 and WGD 2038-4008 . We use the Gemini, Magellan, and VLT telescopes to obtain spectra to both measure the stellar velocity dispersions of the main lensing galaxies and to identify the line-of-sight galaxies in these systems. Next, we identify 10 groups in DES J0408-5354 and two groups in WGD 2038-4008 using a group-finding algorithm. We then identify the most significant galaxy and galaxy-group perturbers using the 'flexion shift' criterion. We determine the probability distribution function of the external convergence κext for both of these systems based on our spectroscopy and on the DES-only multiband wide-field observations. Using weighted galaxy counts, calibrated based on the Millennium Simulation, we find that DES J0408-5354 is located in a significantly underdense environment, leading to a tight (width ∼3 per cent), negative-value κext distribution. On the other hand, WGD 2038-4008 is located in an environment of close to unit density, and its low source redshift results in a much tighter κext of ∼1 per cent, as long as no external shear constraints are imposed.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): gravitational lensing: strong - galaxies: groups: general - quasars: individual: (DES J0408-5354 , WGD 2038-4008 )

VizieR on-line data: <Available at CDS (J/MNRAS/498/3241): table1.dat- table4.dat tablea1.dat-tablea3.dat>

Status at CDS : Examining the need for a new acronym. // All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [ALB2017] DES J0408-5354 gLS 04 08 21.70 -53 53 59.6           ~ 32 0
2 [VV2006] J043814.8-122314 QSO 04 38 14.88 -12 17 14.6     17.15     ~ 222 2
3 QSO B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 684 2
4 [VV2006] J203342.1-472343 QSO 20 33 42.12 -47 23 43.9           ~ 124 1
5 [ALK2018] WGD J2038-4008 gLS 20 38 02.707 -40 08 13.59           ~ 17 0

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