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

Research output: Contribution to journalArticle

Original languageEnglish
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
DOIs
DateAccepted/In press - 21 Oct 2019

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.

    Research areas

  • galaxies: evolution, galaxies: fundamental parameters, galaxies: structure, fundamental parameters, galaxies: star formation, galaxies: stellar content

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  • Full-text PDF (author’s accepted manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Oxford University Press at https://doi.org/10.1093/mnras/stz2993 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 2 MB, PDF document

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