A spectral energy distribution (SED) is a plot of flux, brightness, or flux density versus frequency or wavelength of light. It is used in many branches of astronomy to characterize astronomical sources. For example, in
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Spectral Energy Distribution — A curve illustrating the variation or spectral irradiance with wavelength … Energy terms
Spectral power distribution — In color science, a spectral power distribution describes the power per unit area per unit wavelength of an illumination (radiant exitance), or more generally, the per wavelength contribution to any radiometric quantity (radiant energy, radiant… … Wikipedia
Spectral line — Continuous spectrum Emission line … Wikipedia
Spectral density — In statistical signal processing and physics, the spectral density, power spectral density (PSD), or energy spectral density (ESD), is a positive real function of a frequency variable associated with a stationary stochastic process, or a… … Wikipedia
Spectral asymmetry — In mathematics and physics, the spectral asymmetry is the asymmetry in the distribution of the spectrum of eigenvalues of an operator. In mathematics, the spectral asymmetry arises in the study of elliptic operators on compact manifolds, and is… … Wikipedia
Spectral slope — In astrophysics and planetary science, spectral slope is a measure of dependence of the reflectance on the wavelength.In digital signal processing, it is a measure of how quickly the spectrum of an audio sound tails off towards the high… … Wikipedia
Energy spectrum — An energy spectrum is a distribution of energy among a large assemblage of particles. It is a statistical representation of the wave energy as a function of the wave frequency, and an empirical estimator of the spectral function. For any given… … Wikipedia
Atomic spectral line — In physics, atomic spectral lines are of two types: * An emission line is formed when an electron makes a transition from a particular discrete energy level of an atom, to a lower energy state, emitting a photon of a particular energy and… … Wikipedia
The Dark Energy Survey — DES logo The Dark Energy Survey (DES) is a survey that aims to probe the dynamics of the expansion of the universe and the growth of large scale structure. The collaboration is composed of research institutes and universities from United… … Wikipedia
Least-squares spectral analysis — (LSSA) is a method of estimating a frequency spectrum, based on a least squares fit of sinusoids to data samples, similar to Fourier analysis. [cite book | title = Variable Stars As Essential Astrophysical Tools | author = Cafer Ibanoglu |… … Wikipedia
