| 释义 |
red shift, n. Chiefly Astr.
Also red-shift, redshift.
[f. red a. and n. + shift n.]
Displacement of spectral lines towards the red end of the spectrum; increase in the wavelength of electromagnetic radiation. Also fig.
1923A. S. Eddington Math. Theory Relativity v. 164 The red shift in the spiral nebulae. 1936Five Halley Lectures 17 This telescope should penetrate to distances where the effects of red-shifts are so great that the requisite data will lie well above the threshold. 1958Listener 11 Dec. 971/2 When we look at these distant regions we find that the light is reddened, indicating that the galaxies are receding from us. As far as we can see, the red shift of the most distant nebulae is still increasing linearly with distance. 1967Daily Tel. 30 Jan. 10/4 The gigantic red-shift of quasars is therefore considered proof by some astronomers that they may be as much as six to eight thousand million light years away from our earth. 1971Sci. Amer. May 56/3 Red shifts are commonly expressed as a fraction or percentage obtained by dividing the measured displacement of a line by the wavelength of the undisplaced line. 1973A. Garner Red Shift 155 Next time it'll be all right, every time, and it isn't. Next time will make up for him—and me. Never... Galactic. Red shift. The further they go, the faster they leave. The sky's emptying. God, this wind's cold. 1976Pract. Electronics Oct. 793/3 During 1975 two teams of astronomers in the United States recorded a red-shift of z = 0·5240 in the optical spectrum of a quasar. 1979Nature 11 Oct. 498/1 Hyperpolarisation of the membrane causes a blueshift of the spectrum when probe is applied to the inside and a redshift for probe bound to the outer surface.
Hence red-shifted a., exhibiting a red shift; also transf.; (as a back-formation) red-shift v. trans.
1963Nature 16 Mar. 1041/1 Some broad lines..may be red-shifted hydrogen lines. 1964Listener 20 Aug. 266/2 Matthews and Greenstein were able to identify the lines of 3C 48, which they found to be red shifted by 37 per cent. 1973Nature 3 Aug. 264/1 As the 3 cm radiation propagates through an expanding Universe it will be redshifted. Ibid. 21/28 Dec. 517/1 The report..seems to provide a rare parallel to the visual pigments of the freshwater Osteichthyes, and to raise the question whether its pigment is a porphyropsin or a redshifted rhodopsin. 1976Pract. Electronics Oct. 793/3 They set up their apparatus to scan for the 21 cm line at what could be its redshifted wavelength. 1979Nature 5 July 20/1 The apparent colours of the faint galaxy identifications (presumably at redshifts of about 0·5) are considerably bluer than expected from redshifting the spectrum of nearby giant ellipticals such as M87. |