Cosmic shear from STIS Pure Parallels: I Data

Details Cosmic shear from STIS Pure Parallels: I Data Cosmic shear from STIS Pure Parallels: I Data

2001-02-20

arxiv.org/abs/astro-ph/0102330v3

Astronomy and Astrophysics

Astrophysics

8 pages, 7 figures. accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20010836

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 http://www.stecf.org/projects/shear/

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