2001A&A...368..766M


Query : 2001A&A...368..766M

2001A&A...368..766M - Astronomy and Astrophysics, volume 368, 766-775 (2001/3-4)

Cosmic shear analysis in 50 uncorrelated VLT fields. Implications for Ω0, σ8.

MAOLI R., VAN WAERBEKE L., MELLIER Y., SCHNEIDER P., JAIN B., BERNARDEAU F., ERBEN T. and FORT B.

Abstract (from CDS):

We observed with the camera FORS1 on the VLT (UT1, ANTU) 50 randomly selected fields and analyzed the cosmic shear inside circular apertures with diameter ranging from 0.5 to 5.0 arcmin. The images were obtained in optimal conditions using the Service Observing proposed by ESO on the VLT, which enabled us to a well-defined and homogeneous set of data. The 50 fields cover a 0.64 square-degrees area spread over more than 1000 square-degrees obtain which provides a sample ideal for minimizing the cosmic variance. Using the same techniques as in Van Waerbeke et al. (2000A&A...358...30V), we measured the cosmic shear signal and investigated the systematics of the VLT sample. We find a significant excess of correlations between galaxy ellipticities on those angular scales. The amplitude and the shape of the correlation as function of angular scale are remarkably similar to those reported so far. Using our combined VLT and CFHT data and adding the results published by other teams we put the first joint constraints on Ω0 and σ8 using cosmic shear surveys. From a deduced average of the redshift of the sources the combined data are consistent with σ8≃0.59+0.03–0.03 Ω0–0.47 (for a CDM power spectrum and Γ=0.21), in excellent agreement with the cosmological constraints obtained from the local cluster abundance. This is consistent with theoretical expectations if the density field grew from initial Gaussian conditions.

Abstract Copyright:

Journal keyword(s): cosmology: theory - cosmology: dark matter - cosmology: gravitational lenses - cosmology: large-scale structure of the Universe

CDS comments: p.768: PG 1313-086 misprint for 1323-086, PG 0131-051 not identified

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SA 92- reg 00 55 03.80 +00 47 13.2           ~ 98 0
2 SA 95- reg 03 53 21.0 -00 01 10           ~ 83 0
3 SA 101- reg 09 57 28.2 -00 19 39           ~ 74 0
4 PG 1323-086 HS* 13 25 39.4670509324 -08 49 19.068159971 12.660 13.341 13.481 13.529 13.608 sdB3IHe8 137 1
5 PG 1633+099 HS* 16 35 24.0242205151 +09 47 49.892841991 13.215 14.205 14.396 14.481 14.609 sdB 105 0
6 SA 109- reg 17 45.1 -00 13           ~ 11 0
7 SA 110- reg 18 45 +00.6           ~ 95 0
8 [L92b] Mark A HS* 20 43 59.2255386146 -10 47 41.693629843 11.854 13.010 13.256 13.370 13.494 sdO 68 1
9 PG 2213-006 HS* 22 16 28.3762668612 -00 21 13.502700359 12.747 13.93 14.14 14.54 14.348 sdOB 74 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-13:43:31

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