Takayuki Tamura Library: 2015

2015/08/20

Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis

http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1504.03002

http://www.nature.com/news/dark-matter-mapped-at-cosmic-scale-1.17311

Weak gravitational lensing allows one to reconstruct the spatial distribution of the projected mass density across the sky. These "mass maps" provide a powerful tool for studying cosmology as they probe both luminous and dark matter. In this paper, we present a weak lensing mass map reconstructed from shear measurements in a 139 deg² area from the Dark Energy Survey (DES) science verification data. We compare the distribution of mass with that of the foreground distribution of galaxies and clusters. The overdensities in the reconstructed map correlate well with the distribution of optically detected clusters. We demonstrate that candidate superclusters and voids along the line of sight can be identified, exploiting the tight scatter of the cluster photometric redshifts. We cross-correlate the mass map with a foreground magnitude-limited galaxy sample from the same data. Our measurement gives results consistent with mock catalogs from N -body simulations that include the primary sources of statistical uncertainties in the galaxy, lensing, and photo-z catalogs. The statistical significance of the cross-correlation is at the 6.8 σ level with 20 arcminute smoothing. We find that the contribution of systematics to the lensing mass maps is generally within measurement uncertainties. In this work, we analyze less than 3% of the final area that will be mapped by the DES; the tools and analysis techniques developed in this paper can be applied to forthcoming larger data sets from the survey.

Takayuki Tamura Library

2015/12/08

Black Hole Blowback

2015/10/29

APPROXIMATELY A THOUSAND ULTRA-DIFFUSE GALAXIES IN THE COMA CLUSTER

2015/10/23

Flows of X-ray gas reveal the disruption of a star by a massive black hole

2015/10/20

Dark matter maps reveal cosmic scaffolding

2015/09/11

A Hidden World of Complex Dark Matter Could Be Uncovered

2015/09/07

NASA spies Earth-sized exoplanet

2015/08/27

X線鉄輝線共鳴散乱を用いた銀河団内高温プラズマでの乱流の大きさの制限

発展し続ける一般相対論―時空論の起承転"望"―

2015/08/20

Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis

2015/08/05

アインシュタインからの宿題：重力波の検出

2015/07/09

宇宙におけるプラズマ現象と長距離相互作用

Search for gas bulk motions in eight nearby clusters with Suzaku

2015/06/24

Formation rate of gravitational structures and the cosmic X-ray background radiation

2015/06/11

A century of general relativity: Astrophysics and cosmology

2015/06/10

The dark side of cosmology: Dark matter and dark energy

2015/04/16

Kitayama 2014, review of SZ

Cosmological and Astrophysical Implications of the Sunyaev-Zel'dovich Effect

2015/04/13

Wideband Very Large Array Observations of A2256. I. Continuum, Rotation Measure, and Spectral Imaging

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