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The article analyzes Doppler shifts in different physical contexts, such as mirrors, lenses, and gravity. Two curious effects related to gravitational lenses are described. The relationship between emission frequency and detected frequency in the Doppler effect is mentioned. The redshift in the reflection of light in mirrors and in Einstein rings is also discussed. The Doppler effect in non-homogeneous media and gravitational lenses is explained. However, it is concluded that the differences in redshifts in gravitational lenses cannot be detected with current precision. [Extracted from the article]

The simultaneous identification of the high ionization forbidden lines [Fe VII] λ6087 and [Ne V] λ3426 in spectra of quasars is the main interest of this paper. In order to obtain information of these lines we examined a sample of 1423 spectra of quasars obtained from the Sloan Digital Sky Servey (SDSS) utilizing a selection criteria for the redshift (0.14 ≤ z ≤ 01.12). We only detect 18 objects with the two lines of interest. With the fluxes of coronal lines and other forbidden lines we constructed a diagnostic diagram which allowed us to superimpose photoionization models carried out in CLOUDY in order to determine suitable physical conditions of the emission zone. [ABSTRACT FROM AUTHOR]

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Have been chosen 14 spectra of nearby galaxies of a group of 99 given by Daniela Calzetti, Anne L. Kinney, Thaisa Storchi-Bergmann of the Space Telescope Science Institute. With 14 spectra reduced and extracted we has proceeded to identify the lines Hβ, Hα, [OIII], [NII], and to determining the redshift of every spectrum and the respective correction for redshift. We determine the flows corresponding to the lines [OIII] and using an equivalent relation of balance of energy we determining the temperature using Newton Rapson's method with the intention of discussing and analyzing a possible functionality between the temperature and the Star Formation Rate SFR. [ABSTRACT FROM AUTHOR]

14 spectra of near galaxies of a group of 99 have been chosen provided by Daniela Calzetti, Anne L. Kinney, Thaisa Storchi-Bergmann of the Space Telescope Science Institute. With the 14 spectra already reduced and extracted it has been come to identify the lines Hα, Hβ, OIII, NII, and to determine the landslide to red of each spectra and its respective correction by Redshift. The flows corresponding to each line of emission are determined. And later computers on line of the Extragalactic Data Base of the NASA are used to obtain a set of parameters astrophysicists who allow to determine the luminosity of the Hα line. The results are discussed in a conceptual context derived from recent extragalactic observations. [ABSTRACT FROM AUTHOR]