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A photometrically and spectroscopically confirmed population of passive spiral galaxies

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

Authors

Amelia Fraser-McKelvie

Michael J. I. Brown

Tim Dolley

Jacob P. Crossett

Nicolas J. Bonne

Abstract

We have identified a population of passive spiral galaxies from photometry and integral field spectroscopy. We selected z < 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 the Wide-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 4000 Å 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 Article Type Article
Publication Date Oct 11, 2016
Journal Monthly notices of the Royal Astronomical Society: Letters
Print ISSN 1745-3933
Electronic ISSN 1745-3925
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 462
Issue 1
Pages L11-L15
DOI https://doi.org/10.1093/mnrasl/slw117
Keywords Galaxies : evolution; Galaxies : general; Galaxies : stellar content; Galaxies : spiral
Publisher URL http://mnrasl.oxfordjournals.org/content/462/1/L11.abstract
Additional Information 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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Copyright Statement
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society



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