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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 198316.0, MPI für Astronomie / Publikationen_mpia
The shear power spectrum from the COMBO-17 survey
Authors:Brown, M. L.; Taylor, A. N.; Bacon, D. J.; Gray, M. E.; Dye, S.; Meisenheimer, K.; Wolf, C.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Start Page:100
End Page:118
Review Status:not specified
Audience:Not Specified
Abstract / Description:We perform a statistical weak lensing or
`cosmic shear' analysis of the COMBO-17 survey -
a unique data set with shear quality R-band
imaging and accurate photometric redshift
estimates ( sigma;z= 0.05) for ~90
per cent of galaxies to mR lt;= 24.0.
We undertake a full maximum likelihood analysis
to measure directly from the data the weak
lensing power spectra,
C kappa; kappa;l,
C beta; beta;l and
C kappa; beta;l in five
band powers from l= 400 to l= 104,
where kappa; is the usual lens convergence and
beta; is an odd-parity `curl' component of the
shear signal. We find a strong measurement of
the convergence power over five fields. The
non-gravitational beta;-field has a much lower
significance, indicating our data are free of
major systematics, while the cross-correlation of
kappa; and beta; is consistent with zero. We
have also calculated the shear correlation
functions and variance over a range of scales
between 0.5 and 20 arcmin. Our measurements of
minimal star-galaxy correlations and
cross-correlations between galaxy components
provide further evidence that any systematics
are negligible.
Free Keywords:gravitational lensing; cosmology:
; observations; large-scale structure of Universe
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Edinburgh, Blackford Hill, Edinburgh EH9 3HJ),
AB(Institute for Astronomy, University of
Edinburgh, Blackford Hill, Edinburgh EH9 3HJ),
AC(Institute for Astronomy, University of
Edinburgh, Blackford Hill, Edinburgh EH9 3HJ),
AD(Institute for Astronomy, University of
Edinburgh, Blackford Hill, Edinburgh EH9 3HJ),
AE(Astrophysics Group, Blackett Laboratory,
Imperial College, Prince Consort Road, London SW7
2BW), AF(Max-Planck-Institut f uuml;r
Astronomie, K ouml;nigstuhl 17, D-69117
Heidelberg, Germany), AG(Department of Physics,
University of Oxford, Keble Road, Oxford OX1 3RH)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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