Galaxy And Mass Assembly (GAMA): Properties and evolution of red spiral galaxies

Abstract

We use multi-wavelength data from the Galaxy and Mass Assembly (GAMA) survey to explore the cause of red optical colours in nearby (0.002<z<0.06) spiral galaxies. We show that the colours of red spiral galaxies are a direct consequence of some environment-related mechanism(s) which has removed dust and gas, leading to a lower star formation rate. We conclude that this process acts on long timescales (several Gyr) due to a lack of morphological transformation associated with the transition in optical colour. The sSFR and dust-to-stellar mass ratio of red spiral galaxies is found to be statistically lower than blue spiral galaxies. On the other hand, red spirals are on average $0.9$ dex more massive, and reside in environments 2.6 times denser than their blue counterparts. We find no evidence of excessive nuclear activity, or higher inclination angles to support these as the major causes for the red optical colours seen in >= 47% of all spirals in our sample. Furthermore, for a small subsample of our spiral galaxies which are detected in HI, we find that the SFR of gas-rich red spiral galaxies is lower by ~1 dex than their blue counterparts.

Accepted for publication in the MNRAS; 11 pages; 12 figures

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• Massive Red Spiral Galaxies in SDSS-IV MaNGA Survey
• AGN and Star-Formation Properties of Inside-out Assembled Galaxy Candidates at z<0.1
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• A giant central red disk galaxy at redshift $z=0.76$: challenge to theories of galaxy formation
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