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- W2744674270 abstract "There are multiple ways in which to select post-starburst galaxies in the literature. In this work, we present a study into how two well-used selection techniques have consequences on observable post-starburst galaxy parameters, such as colour, morphology and environment, and how this affects interpretations of their role in the galaxy duty cycle. We identify a master sample of H δ strong (EWH δ > 3Å) post-starburst galaxies from the value-added catalogue in the seventh data release of the Sloan Digital Sky Survey (SDSS DR7) over a redshift range 0.01 < z < 0.1. From this sample we select two E+A subsets, both having a very little [O ii] emission (EW|$_{[rm O,{scriptscriptstyle II}]}$| > −2.5 Å) but one having an additional cut on EWHα (>−3 Å). We examine the differences in observables and AGN fractions to see what effect the H α cut has on the properties of post-starburst galaxies and what these differing samples can tell us about the duty cycle of post-starburst galaxies. We find that H δ strong galaxies peak in the ‘blue cloud’, E+As in the ‘green valley’ and pure E+As in the ‘red sequence’. We also find that pure E+As have a more early-type morphology and a higher fraction in denser environments compared with the H δ strong and E+A galaxies. These results suggest that there is an evolutionary sequence in the post-starburst phase from blue discy galaxies with residual star formation to passive red early-types." @default.
- W2744674270 created "2017-08-17" @default.
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- W2744674270 date "2017-08-12" @default.
- W2744674270 modified "2023-10-18" @default.
- W2744674270 title "The evolutionary sequence of post-starburst galaxies" @default.
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- W2744674270 doi "https://doi.org/10.1093/mnras/stx2034" @default.
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