Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map

C. Chang , A. Pujol (1, 2) , B. Mawdsley , D. Bacon , J. Elvin-Poole , P. Melchior , A. Kovács , B. Jain , B. Leistedt , T. Giannantonio , A. Alarcon , E. Baxter , K. Bechtol , M.R. Becker , A. Benoit-Lévy (3) , G.M. Bernstein , C. Bonnett , M.T. Busha , A. Carnero Rosell , F.J. Castander , R. Cawthon , L.N. da Costa , C. Davis , J. de Vicente , J. Derose , A. Drlica-Wagner , P. Fosalba , M. Gatti , E. Gaztanaga , D. Gruen , J. Gschwend , W.G. Hartley , B. Hoyle , E.M. Huff , M. Jarvis , N. Jeffrey , T. Kacprzak , H. Lin , N. Maccrann , M.A.G. Maia , R.L.C. Ogando , J. Prat , M.M. Rau , R.P. Rollins , A. Roodman , E. Rozo , E.S. Rykoff , S. Samuroff , C. Sánchez , I. Sevilla-Noarbe , E. Sheldon , M.A. Troxel , T.N. Varga , P. Vielzeuf , V. Vikram , R.H. Wechsler , J. Zuntz , T.M.C. Abbott , F.B. Abdalla , S. Allam , J. Annis , E. Bertin (3) , D. Brooks , E. Buckley-Geer , D.L. Burke , M. Carrasco Kind , J. Carretero , M. Crocce , C.E. Cunha , C.B. d'Andrea , S. Desai , H.T. Diehl , J.P. Dietrich , P. Doel , J. Estrada , A. Fausti Neto , E. Fernandez , B. Flaugher , J. Frieman , J. García-Bellido , R.A. Gruendl , G. Gutierrez , K. Honscheid , D.J. James , T. Jeltema , M.W.G. Johnson , M.D. Johnson , S. Kent , D. Kirk , E. Krause , K. Kuehn , S. Kuhlmann , O. Lahav , T.S. Li , M. Lima , M. March , P. Martini , F. Menanteau , R. Miquel , J.J. Mohr , E. Neilsen , R.C. Nichol , D. Petravick , A.A. Plazas , A.K. Romer , M. Sako , E. Sanchez , V. Scarpine , M. Schubnell , M. Smith , R.C. Smith , M. Soares-Santos , F. Sobreira , E. Suchyta , G. Tarle , D. Thomas , D.L. Tucker , A.R. Walker , W. Wester , Y. Zhang

1 DAP - Département d'Astrophysique (ex SAP)
2 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
3 IAP - Institut d'Astrophysique de Paris

We construct the largest curved-sky galaxy weak lensing mass map to date from the DES first-year (DES Y1) data. The map, about 10 times larger than the previous work, is constructed over a contiguous ≈1500 deg^2, covering a comoving volume of ≈10 Gpc^3. The effects of masking, sampling, and noise are tested using simulations. We generate weak lensing maps from two DES Y1 shear catalogues, MetaCalibration and Im3shape, with sources at redshift 0.2 < z < 1.3, and in each of four bins in this range. In the highest signal-to-noise map, the ratio between the mean signal to noise in the E-mode map and the B-mode map is ∼1.5 (∼2) when smoothed with a Gaussian filter of σ_G = 30 (80) arcmin. The second and third moments of the convergence κ in the maps are in agreement with simulations. We also find no significant correlation of κ with maps of potential systematic contaminants. Finally, we demonstrate two applications of the mass maps: (1) cross-correlation

Mots clés: gravitational lensing: weak; surveys; dark matter

Domaines: Astrophysique [astro-ph]

C. Chang, A. Pujol, B. Mawdsley, D. Bacon, J. Elvin-Poole, et al.. Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map. Monthly Notices of the Royal Astronomical Society, 2018, 475 (3), pp.3165-3190. ⟨10.1093/mnras/stx3363⟩. ⟨hal-01768143⟩