A photometrically and spectroscopically confirmed population of passive spiral galaxies
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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.
|Journal||Monthly Notices of the Royal Astronomical Society: Letters|
|Early online date||15 Jun 2016|
|Publication status||Published - 11 Oct 2016|
- A photometrically and spectroscopically confirmed population of passive spiral galaxies
Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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