ASPECT (which stands for Area SPECTrograph) is a software package which coordinates the acquisition of IPCS spectral data with telescope scanning to produce spectra of rectangular regions of the sky. The 3D data arrays it produces (`data cubes') have one wavelength dimension and (normally) two spatial dimensions, along and perpendicular to the spectrograph slit.
While Taurus produces data cubes for emission-line objects, ASPECT can be used for both absorption and emission-line work. The choice between the two depends on the size of the data cube required; generally Taurus is more efficient over a small spectral range at high resolution, while ASPECT is used when a wide wavelength coverage is needed.
ASPECT has several advantages over traditional methods of long-slit spectroscopy for extended objects, for example:
ASPECT can also be used in a high-speed mode, without scanning the telescope, to take spectra of a rapidly varying object with high time resolution and no little or no dead time between scans.
Full details of the ASPECT package are given in AAO UM 15: ASPECT: Area spectroscopy using IPCS with AAT scanning.
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