2019
DOI: 10.1093/mnrasl/slz106
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Exploring a new definition of the green valley and its implications

Abstract: ABSTRACT The distribution of galaxies on a colour–magnitude diagram reveals a bimodality, featuring a passively evolving red sequence and a star-forming blue cloud. The region between these two, the green valley (GV), represents a fundamental transition where quenching processes operate. We exploit an alternative definition of the GV using the 4000 Å break strength, an indicator that is more resilient than colour to dust attenuation. We compare and contrast our G… Show more

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Cited by 32 publications
(26 citation statements)
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“…The older objects in our sample show instead a lower limit to their instantaneous SFR, derived from their Lyα luminosity, that suggests they are undergoing a second burst of star formation, while the light of the galaxy is dominated by an older population of stars. This rejuvenation effect has also recently been observed in low-redshift objects by Angthopo et al (2019) and Cooke et al (2019).…”
Section: Discussionsupporting
confidence: 76%
“…The older objects in our sample show instead a lower limit to their instantaneous SFR, derived from their Lyα luminosity, that suggests they are undergoing a second burst of star formation, while the light of the galaxy is dominated by an older population of stars. This rejuvenation effect has also recently been observed in low-redshift objects by Angthopo et al (2019) and Cooke et al (2019).…”
Section: Discussionsupporting
confidence: 76%
“…From these bluer galaxies, the source density drops as their colours become greener. This is referred to as the green valley (Salim 2014;Angthopo et al 2019), which contains galaxies where star-formation has been quenched. Galaxies then become redder in the left of the structure which contains old passive galaxies (termed red sequence galaxies).…”
Section: Unsupervised Clustering With Umapmentioning
confidence: 99%
“…It is also crucial that these results and galaxy properties be interpreted in light of the current theory on galaxy evolution: the galaxy sequence. Through methods provided by Angthopo et al (2019) and complete optical data, it is possible to map each group's member galaxies onto the galaxy sequence, revealing their evolutionary location in the blue cloud, green valley, or red sequence. Identifying a galaxy's location in the green valley, where star formation is halted through some unknown process, is imperative, as this process marks a galaxy undergoing drastic change in its properties.…”
Section: Discussionmentioning
confidence: 99%
“…1-22 contain the same axes and color bar scaling to allow for intergroup comparison. The g-r scale used in the color bar is comparable to that in the Angthopo et al (2019) for uncorrected g-r color.…”
Section: 5mentioning
confidence: 99%