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

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arxiv 1708.01535 v2 pith:4NQCBK3X submitted 2017-08-04 astro-ph.CO

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

C. Chang , A. Pujol , B. Mawdsley , D. Bacon , J. Elvin-Poole , P. Melchior , A. Kov\'acs , B. Jain
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B. Leistedt T. Giannantonio A. Alarcon E. Baxter K. Bechtol M. R. Becker A. Benoit-L\'evy 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. S\'anchez 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 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. Garc\'ia-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 (DES Collaboration)
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keywords mapsmasslensingweakcurved-skykappalargestsignal-to-noise
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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 previous work, is constructed over a contiguous $\approx1,500 $deg$^2$, covering a comoving volume of $\approx10 $Gpc$^3$. The effects of masking, sampling, and noise are tested using simulations. We generate weak lensing maps from two DES Y1 shear catalogs, 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 and the B-mode map is $\sim$1.5 ($\sim$2) when smoothed with a Gaussian filter of $\sigma_{G}=30$ (80) arcminutes. The second and third moments of the convergence $\kappa$ in the maps are in agreement with simulations. We also find no significant correlation of $\kappa$ with maps of potential systematic contaminants. Finally, we demonstrate two applications of the mass maps: (1) cross-correlation with different foreground tracers of mass and (2) exploration of the largest peaks and voids in the maps.

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Cited by 2 Pith papers

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  2. The first AKRA mass map reconstruction from HSC Y1 data

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    AKRA produces the first unbiased kappa maps from HSC Y1 shear catalogs, with simulation tests confirming no bias in power spectrum, variance, skewness, and PDF statistics.