Herschel-atlas/Gama: a difference between star formation rates in strong-line and weak-line radio galaxies

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dc.contributor.authorHardcastle, M.J.
dc.contributor.authorChing, J.H.Y.
dc.contributor.authorJarvis, Matt
dc.date.accessioned2016-10-29T10:19:45Z
dc.date.available2016-10-29T10:19:45Z
dc.date.issued2013
dc.description.abstractWe have constructed a sample of radio-loud objects with optical spectroscopy from the Galaxy and Mass Assembly (GAMA) project over the Herschel Astrophysical Terahertz Large Area Survey (Herschel-ATLAS) Phase 1 fields. Classifying the radio sources in terms of their optical spectra, we find that strong-emission-line sources (‘high-excitation radio galaxies’) have, on average, a factor of ∼4 higher 250-μm Herschel luminosity than weak-line (‘lowexcitation’) radio galaxies and are also more luminous than magnitude-matched radio-quiet galaxies at the same redshift. Using all five H-ATLAS bands, we show that this difference in luminosity between the emission-line classes arises mostly from a difference in the average dust temperature; strong-emission-line sources tend to have comparable dust masses to, but higher dust temperatures than, radio galaxies with weak emission lines. We interpret this as showing that radio galaxies with strong nuclear emission lines are much more likely to be associated with star formation in their host galaxy, although there is certainly not a one-to-one relationship between star formation and strong-line active galactic nuclei (AGN) activity. The strong-line sources are estimated to have star formation rates at least a factor of 3–4 higher than those in the weak-line objects. Our conclusion is consistent with earlier work, generally carried out using much smaller samples, and reinforces the general picture of high-excitation radio galaxies as being located in lower-mass, less evolved host galaxies than their low-excitation counterparts.
dc.description.accreditationWeb of Science
dc.identifier.citationHardcastle, M.J. et al. (2013). Herschel-atlas/Gama: a difference between star formation rates in strong-line and weak-line radio galaxies. Monthly Notices of the Royal Astronomical Society, 429: 2407–2424en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/2463
dc.identifier.urihttp://dx.doi.org/10.1093/mnras/sts510
dc.language.isoenen_US
dc.publisherOUPen_US
dc.rightsCopyright, The Authors
dc.source.urihttp://dx.doi.org/10.1093/mnras/sts510
dc.subjectAstronomy
dc.subjectGalaxies
dc.subjectRadio continuum
dc.subjectGalaxy and Mass Assembly (GAMA)
dc.subjectHerschel Astrophysical Terahertz Large Area Survey (Herschel-ATLAS)
dc.titleHerschel-atlas/Gama: a difference between star formation rates in strong-line and weak-line radio galaxiesen_US
dc.typeArticleen_US

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