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- Photometric_redshift abstract "A photometric redshift is an estimate for the distance of an astronomical object, such as a galaxy or quasar, without measuring its spectrum. The technique uses photometry (that is, the brightness of the object viewed through various standard filters, each of which lets through a relatively broad passband of colours, such as red light, green light, or blue light) to determine the redshift, and hence, through Hubble's law, the distance, of the observed object. The technique relies upon the spectrum of radiation being emitted by the object having strong features that can be detected by the relatively crude filters.The technique was developed in the 1960s, but was largely replaced in the 1970s and 1980s by spectroscopic redshifts, using spectroscopy to observe the frequency (or wavelength) of characteristic spectral lines, and measure the shift of these lines from their laboratory positions. The photometric redshift technique has come back into mainstream use since 2000, as a result of large sky surveys conducted in the late 1990s and 2000s which have detected a large number of faint high-redshift objects, and telescope time limitations mean that only a small fraction of these can be observed by spectroscopy. Photometric redshifts were originally determined by calculating the expected observed data from a known emission spectrum at a range of redshifts. In recent years, Bayesian statistical methods and artificial neural networks have been used to estimate redshifts from photometric data.As photometric filters are sensitive to a range of wavelengths, and the technique relies on making many assumptions about the nature of the spectrum at the light-source, errors for these sorts of measurements can range up to δz = 0.5, and are much less reliable than spectroscopic determinations. In the absence of sufficient telescope time to determine a spectroscopic redshift for each object, the technique of photometric redshifts provides a method to determine an at least qualitative characterization of a redshift.For example, if a Sun-like spectrum had a redshift of z = 1, it would be brightest in the infrared rather than at the yellow-green color associated with the peak of its blackbody spectrum, and the light intensity will be reduced in the filter by a factor of two (i.e. 1+z) (see K correction for more details on the photometric consequences of redshift).".
- Photometric_redshift wikiPageExternalLink node2.html.
- Photometric_redshift wikiPageID "7934734".
- Photometric_redshift wikiPageLength "3349".
- Photometric_redshift wikiPageOutDegree "20".
- Photometric_redshift wikiPageRevisionID "675039805".
- Photometric_redshift wikiPageWikiLink Artificial_neural_network.
- Photometric_redshift wikiPageWikiLink Bayesian_inference.
- Photometric_redshift wikiPageWikiLink Bayesian_method.
- Photometric_redshift wikiPageWikiLink Black_body.
- Photometric_redshift wikiPageWikiLink Blackbody_spectrum.
- Photometric_redshift wikiPageWikiLink Category:Doppler_effects.
- Photometric_redshift wikiPageWikiLink Filter_(optics).
- Photometric_redshift wikiPageWikiLink Frequency.
- Photometric_redshift wikiPageWikiLink Galaxy.
- Photometric_redshift wikiPageWikiLink Hubbles_law.
- Photometric_redshift wikiPageWikiLink Infrared.
- Photometric_redshift wikiPageWikiLink K_correction.
- Photometric_redshift wikiPageWikiLink Observational_error.
- Photometric_redshift wikiPageWikiLink Optical_filter.
- Photometric_redshift wikiPageWikiLink Passband.
- Photometric_redshift wikiPageWikiLink Photometry_(astronomy).
- Photometric_redshift wikiPageWikiLink Quasar.
- Photometric_redshift wikiPageWikiLink Redshift.
- Photometric_redshift wikiPageWikiLink Spectral_line.
- Photometric_redshift wikiPageWikiLink Spectroscopic_redshift.
- Photometric_redshift wikiPageWikiLink Spectroscopy.
- Photometric_redshift wikiPageWikiLink Telescope_time.
- Photometric_redshift wikiPageWikiLink Wavelength.
- Photometric_redshift wikiPageWikiLinkText "Photometric redshift".
- Photometric_redshift wikiPageWikiLinkText "estimated using photometry".
- Photometric_redshift wikiPageWikiLinkText "photometric redshift".
- Photometric_redshift wikiPageWikiLinkText "photometric redshifts".
- Photometric_redshift hasPhotoCollection Photometric_redshift.
- Photometric_redshift wikiPageUsesTemplate Template:Astronomy-stub.
- Photometric_redshift wikiPageUsesTemplate Template:Reflist.
- Photometric_redshift subject Category:Doppler_effects.
- Photometric_redshift hypernym Estimate.
- Photometric_redshift type Astrophysic.
- Photometric_redshift type Effect.
- Photometric_redshift type Mechanic.
- Photometric_redshift comment "A photometric redshift is an estimate for the distance of an astronomical object, such as a galaxy or quasar, without measuring its spectrum. The technique uses photometry (that is, the brightness of the object viewed through various standard filters, each of which lets through a relatively broad passband of colours, such as red light, green light, or blue light) to determine the redshift, and hence, through Hubble's law, the distance, of the observed object.".
- Photometric_redshift label "Photometric redshift".
- Photometric_redshift sameAs Décalage_vers_le_rouge_photométrique.
- Photometric_redshift sameAs Spostamento_fotometrico_verso_il_rosso.
- Photometric_redshift sameAs m.026kn4d.
- Photometric_redshift sameAs Q3967221.
- Photometric_redshift sameAs Q3967221.
- Photometric_redshift wasDerivedFrom Photometric_redshift?oldid=675039805.
- Photometric_redshift isPrimaryTopicOf Photometric_redshift.