The cosmic shear STIS parallel program - First results

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dc.creatorHaemmerle, H.
dc.creatorMiralles, J. -M.
dc.creatorSchneider, P.
dc.creatorErben, T.
dc.creatorFosbury, R. A. E.
dc.creatorFreudling, W.
dc.creatorPirzkal, N.
dc.creatorWhite, S. D. M.
dc.date2001-09-21
dc.date2001-10-09
dc.date.accessioned2026-07-07T02:00:10Z
dc.date.available2026-07-07T02:00:10Z
dc.descriptionSince the Universe is inhomogeneous on scales well below the Hubble radius, light bundles from distant galaxies are deflected and distorted by the tidal gravitational field of the large-scale matter distribution as they propagate through the Universe. Two-point statistical measures of the observed ellipticities, like the dispersion within a finite aperture or the ellipticity cross-correlation, can be related to the power spectrum of the large-scale structure. The measurement of cosmic shear (especially on small angular scales) can thus be used to constrain cosmological parameters and to test cosmological structure formation in the non-linear regime, without any assumptions about the relation between luminous and dark matter. In this paper we will present preliminary cosmic shear measurements on sub-arcminute scales, obtained from archival STIS parallel data. The high angular resolution of HST, together with the sensitivity and PSF-stability of STIS, allows us to measure cosmic shear along many independent lines-of-sight. Ongoing STIS parallel observations, currently being carried out in the frame of a big GO program (8562+9248), will greatly increase the number of available useful fields and will enable us to measure cosmic shear with higher accuracy on sub-arcminute scales.
dc.description5 pages, 4 figures, to be published in "Where's the Matter? Tracing Dark and Bright Matter with the New Generation of Large Scale Surveys", June 2001, Treyer & Tresse Eds., Frontier Group, added acknowledgements
dc.identifierhttps://arxiv.org/abs/astro-ph/0109376
dc.identifierhttp://arxiv.org/abs/astro-ph/0109376
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3368
dc.subjectAstrophysics
dc.titleThe cosmic shear STIS parallel program - First results
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