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
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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.; Rosell, A. Carnero; Kind, M. Carrasco; 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.; DES Collaboration.
In: Monthly Notices of the Royal Astronomical Society, Vol. 498, No. 3, 29.08.2020, p. 3241-3274.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - STRIDES
T2 - 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
AU - Buckley-Geer, E. J.
AU - Lin, H.
AU - Rusu, C. E.
AU - Poh, J.
AU - Palmese, A.
AU - Agnello, A.
AU - Christensen, L.
AU - Frieman, J.
AU - Shajib, A. J.
AU - Treu, T.
AU - Collett, T.
AU - Birrer, S.
AU - Anguita, T.
AU - Fassnacht, C. D.
AU - Meylan, G.
AU - Mukherjee, S.
AU - Wong, K. C.
AU - Aguena, M.
AU - Allam, S.
AU - Avila, S.
AU - Bertin, E.
AU - Bhargava, S.
AU - Brooks, D.
AU - Rosell, A. Carnero
AU - Kind, M. Carrasco
AU - Carretero, J.
AU - Castander, F. J.
AU - Costanzi, M.
AU - da Costa, L. N.
AU - De Vicente, J.
AU - Desai, S.
AU - Diehl, H. T.
AU - Doel, P.
AU - Eifler, T. F.
AU - Everett, S.
AU - Flaugher, B.
AU - Fosalba, P.
AU - Garcia-Bellido, J.
AU - Gaztanaga, E.
AU - Gruen, D.
AU - Gruendl, R. A.
AU - Gschwend, J.
AU - Gutierrez, G.
AU - Hinton, S. R.
AU - Honscheid, K.
AU - James, D. J.
AU - Kuehn, K.
AU - Kuropatkin, N.
AU - Maia, M. A. G.
AU - Marshall, J. L.
AU - DES Collaboration
PY - 2020/8/29
Y1 - 2020/8/29
N2 - 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 kappa(ext) 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 kappa(ext) 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 similar to 3 per cent), negative-value kappa(ext) 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 kappa(ext) of similar to 1 per cent, as long as no external shear constraints are imposed.
AB - 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 kappa(ext) 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 kappa(ext) 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 similar to 3 per cent), negative-value kappa(ext) 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 kappa(ext) of similar to 1 per cent, as long as no external shear constraints are imposed.
KW - gravitational lensing: strong
KW - galaxies: groups: general
KW - quasars: individual: DES J0408-5354, WGD 2038-4008
KW - STELLAR POPULATION SYNTHESIS
KW - GALAXY-GROUP IDENTIFICATION
KW - ANGULAR MASKS
KW - EVOLUTION
KW - I.
KW - RESOLUTION
KW - REDSHIFTS
KW - CLUSTERS
KW - H-0
U2 - 10.1093/mnras/staa2563
DO - 10.1093/mnras/staa2563
M3 - Journal article
VL - 498
SP - 3241
EP - 3274
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 252292544