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Quenching star formation: insights from the local main sequence
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The so-called star-forming main sequence of galaxies is the apparent tight relationship between the star formation rate and stellar mass of a galaxy. Previous studies exclude galaxies which are not strictly 'star forming' from the main sequence, because they do not lie on the same tight relation. Using local galaxies in the Sloan Digital Sky Survey we have classified galaxies according to their emission line ratios, and studied their location on the star formation rate - stellar mass plane. We find that galaxies form a sequence from the `blue cloud' galaxies which are actively forming stars, through a combination of composite, Seyfert, and LINER (Low-ionization nuclear emission-line region) galaxies, ending as 'red-and-dead' galaxies. The sequence supports an evolutionary pathway for galaxies in which star formation quenching by active galactic nuclei (AGN) plays a key role.
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Ageing and Quenching: Influence of Galaxy Environment and Nuclear Activity in Transition Stage
In SDSS galaxies at the transition stage, slow ageing is environment-dependent and sensitive to nuclear activity, while fast quenching shows no significant environmental dependence.
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