In the field of physics and astronomy, red shift refers to the phenomenon that the electromagnetic radiation of an object has a wavelength increase due to some reason. In the visible light band, the spectral line of the spectrum moves to a red end, that is, the wavelength becomes longer and the frequency decreases. At present, the phenomenon of red shift is mostly used to predict the movement of celestial bodies and their laws.
Redshift in the field of physics and astronomy refers to the
There are three types of redshift:
The development of this theme began with the exploration of wave dynamics in the 19th century and was therefore linked to
There can be several different redshift mechanisms for a photon to propagate in a vacuum. Each mechanism can produce a phenomenon similar to the Doppler redshift, which means that z is independent of wavelength. These mechanisms are compared among reference frames using Galileo, Lorentz, or relativistic transformations, respectively.
Redshift
Transformed architecture
Metric
Doppler redshift
Galileo conversion
Euclidean metric
Doppler of Relativity
Lorentz transformation
Minkovsky metric
Cosmological redshift
General relativity transformation
FRW metric
Gravity redshift
General relativity transformation
Redshift can be measured via the spectrum of a single light source. If there are some characteristics in the spectrum, it can be
Redshift can be measured in astronomical observations because
The topics of radiation conversion and physical optics will summarize the possible phenomena and interactions of wavelength and frequency conversion in electromagnetic radiation
2MASS Redshift Survey
Use the result that caused the displacement. In these cases displacements and physically corresponding energies are transferred to matter or other photons, rather than due to transitions between reference coordinate systems. These transfers can be attributed to agglomeration (see Wolff effect) or charged from elementary particles, particulate matter, or from undulating dielectric media, resulting in scattering of electromagnetic radiation. When these phenomena correspond to the phenomenon of "red shift" or "blue shift", it is the phenomenon of the interaction of physical electromagnetic radiation field itself or the matter of intervention (intervention) from the reference coordinate system effect. In astrophysics, the result of the mass-light interaction is usually reddening rather than redshifting in the energy transfer of the radiation field, and this item is usually reserved for the effects discussed earlier.
In many cases, scattering causes reddening of the radiation, because entropy will cause the photons to reach the lowest energy and reduce high-energy photons (total energy conservation). Except in the case of careful control, scattering does not span the entire spectrum in the same change. In other words, the calculated z at any one wavelength is only a function of the wavelength, and random scattering from the medium may usually occur at At any angle, z is a function of the scattering angle. If multiple scatterings occur, or the scattered particles are in relative motion, then usually the spectral lines will be distorted.
In interstellar astronomy, interstellar reddening occurs in the visible spectrum due to the scattering process through interstellar mattersimilar to the reddish sunlight and blue Rayleigh scattering in the sky caused by the atmosphere at sunrise or sunset. This apparent shift to red is due to the fact that the red part of the spectral line has not been shifted to other wavelengths, and the combination of additional dimming and distortion, these phenomena cause photons to appear or disappear in sight.
