Measurement of cosmic shear with the space telescope imaging spectrograph

被引:47
作者
Rhodes, J
Refregier, A
Collins, NR
Gardner, JP
Groth, EJ
Hill, RS
机构
[1] NASA, Goddard Space Flight Ctr, Astron & Solar Phys Lab, Greenbelt, MD 20771 USA
[2] CALTECH, Pasadena, CA 91125 USA
[3] CEA Saclay, Serv Astrophys, F-91191 Gif Sur Yvette, France
[4] Inst Astron, Cambridge CB3 OHA, England
[5] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[6] Sci Syst & Applicat Inc, Greenbelt, MD USA
关键词
cosmology : observations; dark matter; gravitational lensing;
D O I
10.1086/382181
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Weak lensing by large-scale structure allows a direct measure of the dark matter distribution. We have used parallel images taken with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope to measure weak lensing, or cosmic shear. We measure the shapes of 26,036 galaxies in 1292 STIS fields and measure the shear variance at a scale of 0.'51. The charge transfer efficiency (CTE) of STIS has degraded over time and introduces a spurious ellipticity into galaxy shapes during the readout process. We correct for this effect as a function of signal-to-noise ratio and CCD position. We further show that the detected cosmic shear signal is nearly constant in time over the approximately 4 yr of observation. We detect cosmic shear at the 5.1 sigma level, and our measurement of the shear variance is consistent with theoretical predictions in a LambdaCDM universe. This provides a measure of the normalization of the mass power spectrum sigma(8) = (1.02 +/- 0.16)(0.3/Omega(m)) (0.46)(0.21/Gamma)(0.18). The 1 sigma error includes noise, cosmic variance, systematics, and the redshift uncertainty of the source galaxies. This is consistent with previous cosmic shear measurements, but tends to favor those with a high value of sigma(8). It is also consistent with the recent determination of sigma(8) from the Wilkinson Microwave Anisotropy Probe (WMAP) experiment.
引用
收藏
页码:29 / 36
页数:8
相关论文
共 35 条
[1]   Detection of weak gravitational lensing by large-scale structure [J].
Bacon, DJ ;
Refregier, AR ;
Ellis, RS .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2000, 318 (02) :625-640
[2]   Joint cosmic shear measurements with the Keck and William Herschel telescopes [J].
Bacon, DJ ;
Massey, RJ ;
Refregier, AR ;
Ellis, RS .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 344 (03) :673-685
[3]  
BAUM S, 1996, STIS INSTRUMENT HDB
[4]   Shapes and shears, stars and smears: Optimal measurements for weak lensing [J].
Bernstein, GM ;
Jarvis, M .
ASTRONOMICAL JOURNAL, 2002, 123 (02) :583-618
[5]   SExtractor: Software for source extraction [J].
Bertin, E ;
Arnouts, S .
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1996, 117 (02) :393-404
[6]   The shear power spectrum from the COMBO-17 survey [J].
Brown, ML ;
Taylor, AN ;
Bacon, DJ ;
Gray, ME ;
Dye, S ;
Meisenheimer, K ;
Wolf, C .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 341 (01) :100-118
[7]  
Brown R, 2001, IMECHE CONF TRANS, V2001, P3
[8]   The STIS parallel survey: Introduction and first results [J].
Gardner, JP ;
Hill, RS ;
Baum, SA ;
Collins, NR ;
Ferguson, HC ;
Fosbury, RAE ;
Gilliland, RL ;
Green, RF ;
Gull, TR ;
Heap, SR ;
Lindler, DJ ;
Malumuth, EM ;
Micol, A ;
Pirzkal, N ;
Sandoval, JL ;
Tolstoy, E ;
Walsh, JR ;
Woodgate, BE .
ASTROPHYSICAL JOURNAL, 1998, 492 (02) :L99-L102
[9]  
Goudfrooij P., 2002, 2002 HST CAL WORKSH, P105
[10]   Cosmic shear statistics in the Suprime-Cam 2.1 square degree field:: Constraints on Ωm and σ8 [J].
Hamana, T ;
Miyazaki, S ;
Shimasaku, K ;
Furusawa, H ;
Doi, M ;
Hamabe, M ;
Imi, K ;
Kimura, M ;
Komiyama, Y ;
Nakata, F ;
Okada, N ;
Okamura, S ;
Ouchi, M ;
Sekiguchi, M ;
Yagi, M ;
Yasuda, N .
ASTROPHYSICAL JOURNAL, 2003, 597 (01) :98-110