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CUBISM, the CUbe Builder for IRS Spectral Mapping, is a package which supports the analysis and reduction of spectral maps created with the IRS Spectrograph aboard the Spitzer Space Telescope. It is written in the Interactive Data Language (IDL). CUBISM is designed to allow sets of basic calibrated data (‘BCDs’) from IRS mapping observations to be combined into single 3D spectral cubes, with two spatial and one spectral dimension. From these cubes, spectra can be extracted over differing apertures, and arbitrary maps can be made in spectral features (e.g. a continuum-subtracted line image).
CUBISM was developed at the University of Arizona by the Spitzer Infrared Nearby Galaxies Survey (SINGS) team(1), in partial fulfillment of its Spitzer Legacy commitments. It is distributed and supported by the Spitzer Science Center at Caltech, Pasadena.
CUBISM consists of three main components, which together form the core of its analysis and reduction capabilities:
CUBISM Project | Manage ‘BCD’ data, and track all the various information required to build cubes, including calibration data, background information, bad pixels, aperture information, etc. |
CubeView | General purpose viewer with a variety of tools for interacting with 2D spectral images, full spectral cubes, and visualization overlay FITS images. |
CubeSpec | View and manipulate extracted spectra, and create maps from spectral cubes. |
CUBISM is not a general purpose spectral analysis tool. The tools it offers are oriented directly towards the task of creating, validating, and analyzing spectral cubes. Since individual spectra, spectral maps, and full spectral cubes can be output from a single cube project, other tools can easily be used for higher order analysis of these outputs (e.g. multiple Gaussian fitting, etc.).
This manual is organized as follows. After discussing the installation and requirements of CUBISM in Installation, we give a quick start guide to building a spectral cube from an example mapping data set in Quick Start Guide. We then cover in detail the menu options and capabilities of the three main tools which comprise CUBISM (see section The Tools). Then we discuss in greater depth the steps required to build a cube in Cube Assembly, explain methods of analyzing the cube (see section Cube Analysis), and finish with common tips and troubleshooting (see section Tips and Troubleshooting).
Note that this manual does not include information on planning IRS spectral mapping observations; see the IRS Spectral Map HOWTO for information on observation planning.
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