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Reference: Bureau, M, Nyland, K, Young, LM et al., (2016). Star formation in nearby early-type galaxies: The radio continuum perspective. Monthly Notices of the Royal Astronomical Society, 464 (1), 1029-1064.Citable link to this page:


Star formation in nearby early-type galaxies: The radio continuum perspective

Abstract: We present a 1.4 GHz Karl G. Jansky Very Large Array (VLA) study of a sample of early-type galaxies (ETGs) from the volume- and magnitude-limited ATLAS3D survey. The radio morphologies of these ETGs at a resolution of θFWHM ≈ 5'' are diverse and include sources that are compact on sub-kpc scales, resolved structures similar to those seen in star-forming spiral galaxies, and kpc-scale radio jets/lobes associated with active nuclei. We compare the 1.4 GHz, molecular gas, and infrared (IR) properties of these ETGs. The most CO-rich ATLAS3D ETGs have radio luminosities consistent with extrapolations from H2 mass-derived star formation rates from studies of late-type galaxies. These ETGs also follow the radio-IR correlation. However, ETGs with lower molecular gas masses tend to have less radio emission relative to their CO and IR emission compared to spirals. The fraction of galaxies in our sample with high IR-radio ratios is much higher than in previous studies, and cannot be explained by a systematic underestimation of the radio luminosity due to the presence extended, low-surface-brightness emission that was resolved-out in our VLA observations. In addition, we find that the high IR-radio ratios tend to occur at low IR luminosities, but are not associated with low dynamical mass or metallicity. Thus, we have identified a population of ETGs that have a genuine shortfall of radio emission relative to both their IR and molecular gas emission. A number of mechanisms may conspire to cause this radio deficiency, including a bottom-heavy stellar initial mass function,weak magnetic fields, a higher prevalence of environmental effects compared to spirals and enhanced cosmic ray losses

Publication status:PublishedPeer Review status:Peer reviewedVersion:Accepted manuscriptDate of acceptance:2016-09-16 Funder: National Science Foundation   Funder: Seventh Framework Programme   Funder: National Aeronautics and Space Administration   Notes:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Bibliographic Details

Publisher: Oxford University Press

Publisher Website:

Journal: Monthly Notices of the Royal Astronomical Societysee more from them

Publication Website:

Volume: 464

Issue: 1

Extent: 1029-1064

Issue Date: 2016-09


Issn: 1365-2966

Uuid: uuid:5afa1e6b-7cde-4301-98a6-f02b79460f7c

Urn: uri:5afa1e6b-7cde-4301-98a6-f02b79460f7c

Pubs-id: pubs:656093

Doi: Item Description

Type: journal-article;

Version: Accepted manuscriptKeywords: galaxies: elliptical and lenticular radio continuum: galaxies galaxies: star formation


Author: Bureau, M - Oxford, MPLS, Physics, Astrophysics - - - Nyland, K - - - Young, LM - - - Wrobel, JM - - - Davis, TA - - - Alatalo, K



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