The DES Science Verification weak lensing shear catalogues

We present weak lensing shear catalogues for 139 square degrees of data taken during the Science Verification (SV) time for the new Dark Energy Camera (DECam) being used for the Dark Energy Survey (DES). We describe our object selection, point spread function estimation and shear measurement procedu...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2016-08, Vol.460 (2), p.2245-2281
Main Authors: Jarvis, M., Sheldon, E., Zuntz, J., Kacprzak, T., Bridle, S. L., Amara, A., Armstrong, R., Becker, M. R., Bernstein, G. M., Bonnett, C., Chang, C., Das, R., Dietrich, J. P., Drlica-Wagner, A., Eifler, T. F., Gangkofner, C., Gruen, D., Hirsch, M., Huff, E. M., Jain, B., Kent, S., Kirk, D., MacCrann, N., Melchior, P., Plazas, A. A., Refregier, A., Rowe, B., Rykoff, E. S., Samuroff, S., Sánchez, C., Suchyta, E., Troxel, M. A., Vikram, V., Abbott, T., Abdalla, F. B., Allam, S., Annis, J., Benoit-Lévy, A., Bertin, E., Brooks, D., Buckley-Geer, E., Burke, D. L., Capozzi, D., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Castander, F. J., Clampitt, J., Crocce, M., Cunha, C. E., D'Andrea, C. B., da Costa, L. N., DePoy, D. L., Desai, S., Diehl, H. T., Doel, P., Fausti Neto, A., Flaugher, B., Fosalba, P., Frieman, J., Gaztanaga, E., Gerdes, D. W., Gruendl, R. A., Gutierrez, G., Honscheid, K., James, D. J., Kuehn, K., Kuropatkin, N., Lahav, O., Li, T. S., Lima, M., March, M., Martini, P., Miquel, R., Mohr, J. J., Neilsen, E., Nord, B., Ogando, R., Reil, K., Romer, A. K., Roodman, A., Sako, M., Sanchez, E., Scarpine, V., Schubnell, M., Sevilla-Noarbe, I., Smith, R. C., Soares-Santos, M., Sobreira, F., Swanson, M. E. C., Tarle, G., Thaler, J., Thomas, D., Walker, A. R., Wechsler, R. H.
Format: Article
Language:English
Subjects:
Algorithms
Astronomy
ASTRONOMY AND ASTROPHYSICS
Astrophysics
Cameras
Catalogues
cosmology: observations
Dark energy
Galaxies
gravitational lensing: weak
Measurement
methods: data analysis
Pipelines
Point spread functions
Sciences of the Universe
Shear
Shear stress
surveys
Systematic errors
techniques: image processing
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Summary:We present weak lensing shear catalogues for 139 square degrees of data taken during the Science Verification (SV) time for the new Dark Energy Camera (DECam) being used for the Dark Energy Survey (DES). We describe our object selection, point spread function estimation and shear measurement procedures using two independent shear pipelines, im3shape and ngmix, which produce catalogues of 2.12 million and 3.44 million galaxies, respectively. We detail a set of null tests for the shear measurements and find that they pass the requirements for systematic errors at the level necessary for weak lensing science applications using the SV data. We also discuss some of the planned algorithmic improvements that will be necessary to produce sufficiently accurate shear catalogues for the full 5-yr DES, which is expected to cover 5000 square degrees.
ISSN:0035-8711
1365-2966
1365-2966
DOI:10.1093/mnras/stw990