Green valley galaxies
The “green valley” is a wide region separating the blue and the red peaks in the ultraviolet-optical color magnitude diagram, first revealed using GALEX UV photometry. The term was coined by Christopher Martin (Caltech), in 2005. Green valley highlights the discriminating power of UV to ver...
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| Format: | Article |
| Language: | English |
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Astronomical Observatory, Department of Astronomy, Belgrade
2014-01-01
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| Series: | Serbian Astronomical Journal |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1489001S.pdf |
| _version_ | 1818401907080691712 |
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| author | Salim S. |
| author_facet | Salim S. |
| author_sort | Salim S. |
| collection | DOAJ |
| description | The “green valley” is a wide region separating the blue and the red peaks in
the ultraviolet-optical color magnitude diagram, first revealed using GALEX
UV photometry. The term was coined by Christopher Martin (Caltech), in 2005.
Green valley highlights the discriminating power of UV to very low relative
levels of ongoing star formation, to which the optical colors, including u−r,
are insensitive. It corresponds to massive galaxies below the star-forming,
“main” sequence, and therefore represents a critical tool for the study of
the quenching of star formation and its possible resurgence in otherwise
quiescent galaxies. This article reviews the results pertaining to
(predominantly disk) morphology, structure, environment, dust content and gas
properties of green valley galaxies in the local universe. Their relationship
to AGN is also discussed. Attention is given to biases emerging from defining
the “green valley” using optical colors. We review various evolutionary
scenarios and we present evidence for a new one, the quasi-static view of the
green valley, in which the majority (but not all) of galaxies currently in
the green valley were only partially quenched in the distant past and now
participate in a slow cosmic decline of star formation, which also drives
down the activity on the main sequence, presumably as a result of the
dwindling accretion/cooling onto galaxy disks. This emerging synthetic
picture is based on the findings from Fang et al. (2012), Salim et al. (2012)
and Martin et al. (2007), as well as other results. |
| first_indexed | 2024-12-14T07:59:55Z |
| format | Article |
| id | doaj.art-f83a2f8712614f8794061ed687d6aab3 |
| institution | Directory Open Access Journal |
| issn | 1450-698X 1820-9289 |
| language | English |
| last_indexed | 2024-12-14T07:59:55Z |
| publishDate | 2014-01-01 |
| publisher | Astronomical Observatory, Department of Astronomy, Belgrade |
| record_format | Article |
| series | Serbian Astronomical Journal |
| spelling | doaj.art-f83a2f8712614f8794061ed687d6aab32022-12-21T23:10:27ZengAstronomical Observatory, Department of Astronomy, BelgradeSerbian Astronomical Journal1450-698X1820-92892014-01-01201418911410.2298/SAJ1489001S1450-698X1489001SGreen valley galaxiesSalim S.0Indiana University, Department of Astronomy, Bloomington, USAThe “green valley” is a wide region separating the blue and the red peaks in the ultraviolet-optical color magnitude diagram, first revealed using GALEX UV photometry. The term was coined by Christopher Martin (Caltech), in 2005. Green valley highlights the discriminating power of UV to very low relative levels of ongoing star formation, to which the optical colors, including u−r, are insensitive. It corresponds to massive galaxies below the star-forming, “main” sequence, and therefore represents a critical tool for the study of the quenching of star formation and its possible resurgence in otherwise quiescent galaxies. This article reviews the results pertaining to (predominantly disk) morphology, structure, environment, dust content and gas properties of green valley galaxies in the local universe. Their relationship to AGN is also discussed. Attention is given to biases emerging from defining the “green valley” using optical colors. We review various evolutionary scenarios and we present evidence for a new one, the quasi-static view of the green valley, in which the majority (but not all) of galaxies currently in the green valley were only partially quenched in the distant past and now participate in a slow cosmic decline of star formation, which also drives down the activity on the main sequence, presumably as a result of the dwindling accretion/cooling onto galaxy disks. This emerging synthetic picture is based on the findings from Fang et al. (2012), Salim et al. (2012) and Martin et al. (2007), as well as other results.http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1489001S.pdfgalaxies: evolutionultraviolet: galaxies |
| spellingShingle | Salim S. Green valley galaxies Serbian Astronomical Journal galaxies: evolution ultraviolet: galaxies |
| title | Green valley galaxies |
| title_full | Green valley galaxies |
| title_fullStr | Green valley galaxies |
| title_full_unstemmed | Green valley galaxies |
| title_short | Green valley galaxies |
| title_sort | green valley galaxies |
| topic | galaxies: evolution ultraviolet: galaxies |
| url | http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1489001S.pdf |
| work_keys_str_mv | AT salims greenvalleygalaxies |