Cosmic shear from STIS pure parallels I. Data

Following the second HST servicing mission in 1997 when the STIS instrument was installed and the capability for parallel observations was enhanced, a substantial archive of non-proprietary parallel data has been accumulating. In this paper, we discuss the use of unfiltered STIS imaging data for a p...

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Published inAstronomy and astrophysics (Berlin) Vol. 375; no. 1; pp. 351 - 358
Main Authors Pirzkal, N., Collodel, L., Erben, T., Fosbury, R. A. E., Freudling, W., Hämmerle, H., Jain, B., Micol, A., Miralles, J.-M., Schneider, P., Seitz, S., White, S. D. M.
Format Journal Article
LanguageEnglish
Published EDP Sciences 01.08.2001
Subjects
Sciences of the Universe
Astrophysics
COSMOLOGY: OBSERVATIONS
TECHNIQUES: IMAGE PROCESSING
GRAVITATIONAL LENSING
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Summary:Following the second HST servicing mission in 1997 when the STIS instrument was installed and the capability for parallel observations was enhanced, a substantial archive of non-proprietary parallel data has been accumulating. In this paper, we discuss the use of unfiltered STIS imaging data for a project that requires deep observations along as many independent lines-of-sight as possible. We have developed a technique to determine which datasets in the archive can safely be co-added together and have developed an iterative co-addition technique which enabled us to produce 498 high-quality, deep images. The principal motivation for this work is to measure the Cosmic Shear on small angular scales and a value derived from these data will be presented in a subsequent paper. A valuable by-product of this work is a set of high quality combined fields which can be used for other projects. The data are publicly available at www.stecf.org/projects/shear/
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361:20010836