Cosmology from cosmic shear with Dark Energy Survey science verification data
Cosmology from cosmic shear with Dark Energy Survey science verification data
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DOI：
10.1103/physrevd.94.022001
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发表时间：
2015-07
影响因子：
5
通讯作者：
The Dark Energy Survey Collaboration;T. Abbott;F. Abdalla;S. Allam;A. Amara;J. Annis;R. Armstrong;D. Bacon;M. Banerji;A. Bauer;E. Baxter;M. Becker;A. Benoit-Lévy;R. Bernstein;G. Bernstein;E. Bertin;J. Blazek;C. Bonnett;S. Bridle;D. Brooks;C. Bruderer;E. Buckley-Geer;D. Burke;M. Busha;D. Capozzi;A. Rosell;M. Kind;J. Carretero;F. Castander;C. Chang;J. Clampitt;M. Crocce;C. Cunha;C. D'Andrea;L. Costa;R. Das;D. Depoy;S. Desai;H. Diehl;J. Dietrich;S. Dodelson;P. Doel;A. Drlica-Wagner;G. Efstathiou;T. Eifler;B. Erickson;J. Estrada;A. Evrard;A. F. Neto;E. Fernandez;D. Finley;B. Flaugher;P. Fosalba;O. Friedrich;J. Frieman;C. Gangkofner;J. García-Bellido;E. Gaztañaga;D. Gerdes;D. Gruen;R. Gruendl;G. Gutiérrez;W. Hartley;M. Hirsch;K. Honscheid;E. Huff;B. Jain;D. James;M. Jarvis;T. Kacprzak;S. Kent;D. Kirk;E. Krause;A. Kravtsov;K. Kuehn;N. Kuropatkin;J. Kwan;O. Lahav;B. Leistedt;T. Li;M. Lima;H. Lin;N. MacCrann;M. March;J. Marshall;P. Martini;R. McMahon;Peter Melchior;C. Miller;R. Miquel;J. Mohr;E. Neilsen;R. Nichol;A. Nicola;B. Nord;R. Ogando;A. Palmese;H. Peiris;A. Plazas;A. Réfrégier;N. Roe;A. Romer;A. Roodman;B. Rowe;E. Rykoff;C. Sabiu;I. Sadeh;M. Sako;S. Samuroff;C. S'anchez;E. Sánchez;H. Seo;I. Sevilla-Noarbe;E. Sheldon;R. C. Smith;M. Soares-Santos;F. Sobreira;E. Suchyta;M. Swanson;G. Tarlé;J. Thaler;D. Thomas;M. Troxel;V. Vikram;A. Walker;R. Wechsler;J. Weller;Y. Zhang;J. Zuntz
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文献类型：
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作者：
The Dark Energy Survey Collaboration;T. Abbott;F. Abdalla;S. Allam;A. Amara;J. Annis;R. Armstrong;D. Bacon;M. Banerji;A. Bauer;E. Baxter;M. Becker;A. Benoit-Lévy;R. Bernstein;G. Bernstein;E. Bertin;J. Blazek;C. Bonnett;S. Bridle;D. Brooks;C. Bruderer;E. Buckley-Geer;D. Burke;M. Busha;D. Capozzi;A. Rosell;M. Kind;J. Carretero;F. Castander;C. Chang;J. Clampitt;M. Crocce;C. Cunha;C. D'Andrea;L. Costa;R. Das;D. Depoy;S. Desai;H. Diehl;J. Dietrich;S. Dodelson;P. Doel;A. Drlica-Wagner;G. Efstathiou;T. Eifler;B. Erickson;J. Estrada;A. Evrard;A. F. Neto;E. Fernandez;D. Finley;B. Flaugher;P. Fosalba;O. Friedrich;J. Frieman;C. Gangkofner;J. García-Bellido;E. Gaztañaga;D. Gerdes;D. Gruen;R. Gruendl;G. Gutiérrez;W. Hartley;M. Hirsch;K. Honscheid;E. Huff;B. Jain;D. James;M. Jarvis;T. Kacprzak;S. Kent;D. Kirk;E. Krause;A. Kravtsov;K. Kuehn;N. Kuropatkin;J. Kwan;O. Lahav;B. Leistedt;T. Li;M. Lima;H. Lin;N. MacCrann;M. March;J. Marshall;P. Martini;R. McMahon;Peter Melchior;C. Miller;R. Miquel;J. Mohr;E. Neilsen;R. Nichol;A. Nicola;B. Nord;R. Ogando;A. Palmese;H. Peiris;A. Plazas;A. Réfrégier;N. Roe;A. Romer;A. Roodman;B. Rowe;E. Rykoff;C. Sabiu;I. Sadeh;M. Sako;S. Samuroff;C. S'anchez;E. Sánchez;H. Seo;I. Sevilla-Noarbe;E. Sheldon;R. C. Smith;M. Soares-Santos;F. Sobreira;E. Suchyta;M. Swanson;G. Tarlé;J. Thaler;D. Thomas;M. Troxel;V. Vikram;A. Walker;R. Wechsler;J. Weller;Y. Zhang;J. Zuntz
我们使用来自初步科学验证（SV）数据的弱透镜测量，提出了暗能量调查（DES）对宇宙学的第一个约束。我们使用了139平方度的SV数据，不到整个DES调查区域的3%。在对7个系统参数和3个其他宇宙学参数进行边缘化后，通过对3个红移箱进行宇宙剪切2点测量，我们发现sigma8(Omegam/0.3)0.5=0.81±0.06（68%置信度）。我们检查了我们的结果对数据向量和系统假设的选择的稳健性，并发现它们是稳定的。大约20%的误差条来自于剪切和光度红移校准不确定性的边缘化。CFHTLenS目前最先进的宇宙剪切测量结果与普朗克CMB数据的宇宙学约束略有差异；我们的结果与两组数据一致。当我们对两个数据集进行比较分析时，我们的不确定性比CFHTLenS的不确定性大约30%，这主要归因于我们剪切目录的数字密度较低。我们研究了暗能量的约束，并发现，在整个调查的一小部分，DES SV约束对普朗克约束的影响可以忽略不计。CFHTLenS与普朗克值sigma8(Omegam/0.3)0.5之间存在适度分歧，无论w的值如何。
We present the first constraints on cosmology from the Dark Energy Survey (DES), using weak lensing measurements from the preliminary Science Verification (SV) data. We use 139 square degrees of SV data, which is less than 3% of the full DES survey area. Using cosmic shear 2-point measurements over three redshift bins we find sigma8(Omegam/0.3 )0.5=0.81 ±0.06 (68% confidence), after marginalizing over 7 systematics parameters and 3 other cosmological parameters. We examine the robustness of our results to the choice of data vector and systematics assumed, and find them to be stable. About 20% of our error bar comes from marginalizing over shear and photometric redshift calibration uncertainties. The current state-of-the-art cosmic shear measurements from CFHTLenS are mildly discrepant with the cosmological constraints from Planck CMB data; our results are consistent with both data sets. Our uncertainties are ˜30 % larger than those from CFHTLenS when we carry out a comparable analysis of the two data sets, which we attribute largely to the lower number density of our shear catalogue. We investigate constraints on dark energy and find that, with this small fraction of the full survey, the DES SV constraints make negligible impact on the Planck constraints. The moderate disagreement between the CFHTLenS and Planck values of sigma8(Omegam/0.3 )0.5 is present regardless of the value of w .