A photometrically and spectroscopically confirmed population of passive spiral galaxies

Amelia Fraser-McKelvie*, Michael J. I. Brown, Kevin A. Pimbblet, Tim Dolley, Jacob P. Crossett, Nicolas J. Bonne

*Corresponding author for this work

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Abstract

We have identified a population of passive spiral galaxies from photometry and integral field spectroscopy.We selectedz<0.035 spiral galaxies that have WISE colours consistent with little mid-infrared emission from warm dust. Matched aperture photometry of 51 spiral galaxies in ultraviolet, optical and mid-infrared show these galaxies have colours consistent with passive galaxies. Six galaxies form a spectroscopic pilot study and were observed using theWide-Field Spectrograph to check for signs of nebular emission from star formation.We see no evidence of substantial nebular emission found in previous red spiral samples. These six galaxies possess absorption-line spectra with 4000Å breaks consistent with an average luminosity-weighted age of 2.3 Gyr. Our photometric and integral field spectroscopic observations confirm the existence of a population of local passive spiral galaxies, implying that transformation into early-type morphologies is not required for the quenching of star formation.

Original languageEnglish
Pages (from-to)L11-L15
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume462
Issue number1
Early online date15 Jun 2016
DOIs
Publication statusPublished - 11 Oct 2016

Keywords

  • evolution - galaxies
  • galaxies
  • general - galaxies
  • spiral - galaxies
  • stellar content

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