Representations of spectral coordinates in FITS

Preprint

12 July 2005

preprint
Published by arXiv in arXiv

Abstract

Greisen & Calabretta describe a generalized method for specifying the coordinates of FITS data samples. Following that general method, Calabretta & Greisen describe detailed conventions for defining celestial coordinates as they are projected onto a two-dimensional plane. The present paper extends the discussion to the spectral coordinates of wavelength, frequency, and velocity. World coordinate functions are defined for spectral axes sampled linearly in wavelength, frequency, or velocity, linearly in the logarithm of wavelength or frequency, as projected by ideal dispersing elements, and as specified by a lookup table.

Keywords

SPECTRAL COORDINATES
CALABRETTA DESCRIBE
COORDINATES OF FITS
DEFINING CELESTIAL
FITS GREISEN
DATA SAMPLES
WAVELENGTH
GREISEN

All Related Versions

Version 1, 2005-07-12, ArXiv
Version 2, 2005-10-06, ArXiv
Version 3, 2005-10-07, ArXiv
Published version: Astronomy & Astrophysics, 446 (2), 747.

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