Multicolour observations, inhomogeneity and evolution

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dc.contributor.authorHellaby, Charles
dc.date.accessioned2021-10-08T11:00:59Z
dc.date.available2021-10-08T11:00:59Z
dc.date.issued2001
dc.description.abstractWe propose a method of testing source evolution theories that is independent of the effects of inhomogeneity, and thus complementary to other studies of evolution. It is suitable for large scale sky surveys, and the new generation of large telescopes. In an earlier paper it was shown that basic cosmological observations -luminosity versus redshift, area distance versus redshift and number counts versus redshift -cannot separate the effects of cosmic inhomogeneity, cosmic evolution and source evolution. We here investigate multicolour observations, and show that by comparing luminosity versus redshift in two or more colours, contraints can be placed on source evolution even if unknown source evolution is present, providing an important test of evolution theories that is complementary to present methods. However, number counts in different colours versus redshift are not useful in separating the effects of source evolution and inhomogeneity.
dc.identifier.apacitationHellaby, C. (2001). Multicolour observations, inhomogeneity and evolution. <i>Astronomy and Astrophysics</i>, 372(2), 357 - 363. http://hdl.handle.net/11427/35060en_ZA
dc.identifier.chicagocitationHellaby, Charles "Multicolour observations, inhomogeneity and evolution." <i>Astronomy and Astrophysics</i> 372, 2. (2001): 357 - 363. http://hdl.handle.net/11427/35060en_ZA
dc.identifier.citationHellaby, C. 2001. Multicolour observations, inhomogeneity and evolution. <i>Astronomy and Astrophysics.</i> 372(2):357 - 363. http://hdl.handle.net/11427/35060en_ZA
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.ris TY - Journal Article AU - Hellaby, Charles AB - We propose a method of testing source evolution theories that is independent of the effects of inhomogeneity, and thus complementary to other studies of evolution. It is suitable for large scale sky surveys, and the new generation of large telescopes. In an earlier paper it was shown that basic cosmological observations -luminosity versus redshift, area distance versus redshift and number counts versus redshift -cannot separate the effects of cosmic inhomogeneity, cosmic evolution and source evolution. We here investigate multicolour observations, and show that by comparing luminosity versus redshift in two or more colours, contraints can be placed on source evolution even if unknown source evolution is present, providing an important test of evolution theories that is complementary to present methods. However, number counts in different colours versus redshift are not useful in separating the effects of source evolution and inhomogeneity. DA - 2001 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - Astronomy and Astrophysics LK - https://open.uct.ac.za PY - 2001 SM - 0004-6361 SM - 1432-0746 T1 - Multicolour observations, inhomogeneity and evolution TI - Multicolour observations, inhomogeneity and evolution UR - http://hdl.handle.net/11427/35060 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/35060
dc.identifier.vancouvercitationHellaby C. Multicolour observations, inhomogeneity and evolution. Astronomy and Astrophysics. 2001;372(2):357 - 363. http://hdl.handle.net/11427/35060.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematics
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics
dc.source.journalissue2
dc.source.journalvolume372
dc.source.pagination357 - 363
dc.source.urihttps://dx.doi.org/10.1051/0004-6361:20010172
dc.subject.otherAstrophysics
dc.subject.otherGeneral Relativity and Quantum Cosmology
dc.titleMulticolour observations, inhomogeneity and evolution
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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