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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448183.0, MPI für Astronomie / Publikationen_mpia
The slitless spectroscopy data extraction software
Authors:Kümmel, M.; Walsh, J. R.; Pirzkal, N.; Kuntschner, H.; Pasquali, A.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Publications of the Astronomical Society of the Pacific
Journal Abbrev.:PASP
Start Page:59
End Page:72
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The methods and techniques for the slitless spectroscopy software aXe, which was designed to reduce data from the various slitless spectroscopy modes of Hubble Space Telescope instruments, are described. aXe can treat slitless spectra from different instruments such as ACS, NICMOS, and WFC3 through the use of a configuration file that contains all the instrument-dependent parameters. The basis of the spectral extraction within aXe are the position, morphology, and photometry of the objects on a companion direct image. Several aspects of slitless spectroscopy, such as the overlap of spectra, an extraction dependent on object shape, and the provision of flat-field cubes, motivate a dedicated software package, and the solutions offered within aXe are discussed in detail. The effect of the mutual contamination of spectra can be quantitatively assessed in aXe, using spectral and morphological information from the companion direct image(s). A new method named ``aXedrizzle'' for 2D rebinning and co-adding spectral data, taken with small shifts or dithers, is described. The extraction of slitless spectra with optimal weighting is outlined, and the correction of spectra for detector fringing for the ACS CCDs is presented. Auxiliary software for simulating slitless data and for visualizing the results of an aXe extraction is outlined.
Free Keywords:Data Analysis and Techniques
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009PASP..121...59K [ID No:1]
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