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- Unidentified_infrared_emission abstract "The unidentified infrared emission (UIR or UIE) bands are infrared discrete emissions from circumstellar regions, interstellar media, star-forming regions and extragalactic objects for which the identity of the emitting materials is unknown. The main infrared features occur around 3.3, 6.2, 7.7, 8.6, 11.2, and 12.7 μm, although there are many other weak emission features within the ~ 5–18 μm spectral range. In the 1980s, astronomers discovered that the origin of the UIR emission bands is inherent in compounds made of aromatic C–H and C=C chemical bonds, and hypothesized that the materials responsible should be polycyclic aromatic hydrocarbon (PAH) molecules. Nevertheless, recent studies employing data recorded with the ESA Infrared Space Observatory and NASA's Spitzer Space Telescope have suggested that the UIR emission bands arise from compounds that are far more complex in composition and structure than PAH molecules. Moreover, it was established that the UIR bands follow a clear evolutionary spectral trend that is linked to the lifespan of the astronomical source; from the time the UIR bands first appear around evolved stars in the protoplanetary nebula stage to evolved stages such as the planetary nebula phase.The UIR emission phenomenon has been studied for approximately 30 years.".
- Unidentified_infrared_emission wikiPageExternalLink 1987ApJ...314..422B.
- Unidentified_infrared_emission wikiPageExternalLink 1989IAUS..135..141D.
- Unidentified_infrared_emission wikiPageExternalLink 1990ApJ...354..247C.
- Unidentified_infrared_emission wikiPageID "33549502".
- Unidentified_infrared_emission wikiPageLength "2628".
- Unidentified_infrared_emission wikiPageOutDegree "8".
- Unidentified_infrared_emission wikiPageRevisionID "648834051".
- Unidentified_infrared_emission wikiPageWikiLink Category:Infrared.
- Unidentified_infrared_emission wikiPageWikiLink Category:Unsolved_problems_in_astronomy.
- Unidentified_infrared_emission wikiPageWikiLink Infrared.
- Unidentified_infrared_emission wikiPageWikiLink Infrared_Space_Observatory.
- Unidentified_infrared_emission wikiPageWikiLink Planetary_nebula.
- Unidentified_infrared_emission wikiPageWikiLink Polycyclic_aromatic_hydrocarbon.
- Unidentified_infrared_emission wikiPageWikiLink Protoplanetary_nebula.
- Unidentified_infrared_emission wikiPageWikiLink Spitzer_Space_Telescope.
- Unidentified_infrared_emission wikiPageWikiLinkText "Unidentified infrared emission".
- Unidentified_infrared_emission hasPhotoCollection Unidentified_infrared_emission.
- Unidentified_infrared_emission wikiPageUsesTemplate Template:Reflist.
- Unidentified_infrared_emission subject Category:Infrared.
- Unidentified_infrared_emission subject Category:Unsolved_problems_in_astronomy.
- Unidentified_infrared_emission hypernym Emissions.
- Unidentified_infrared_emission comment "The unidentified infrared emission (UIR or UIE) bands are infrared discrete emissions from circumstellar regions, interstellar media, star-forming regions and extragalactic objects for which the identity of the emitting materials is unknown. The main infrared features occur around 3.3, 6.2, 7.7, 8.6, 11.2, and 12.7 μm, although there are many other weak emission features within the ~ 5–18 μm spectral range.".
- Unidentified_infrared_emission label "Unidentified infrared emission".
- Unidentified_infrared_emission sameAs m.0hgl9_0.
- Unidentified_infrared_emission sameAs Q7884841.
- Unidentified_infrared_emission sameAs Q7884841.
- Unidentified_infrared_emission wasDerivedFrom Unidentified_infrared_emission?oldid=648834051.
- Unidentified_infrared_emission isPrimaryTopicOf Unidentified_infrared_emission.