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dc.contributor.authorRawlings, J.
dc.contributor.authorSeymour, Nick
dc.contributor.authorPage, M.
dc.contributor.authorDe Breuck, C.
dc.contributor.authorStern, D.
dc.contributor.authorSymeonidis, M.
dc.contributor.authorAppleton, P.
dc.contributor.authorDey, A.
dc.contributor.authorDickinson, M.
dc.contributor.authorHuynh, M.
dc.contributor.authorLe Floc'h, E.
dc.contributor.authorLehnert, M.
dc.contributor.authorMullaney, J.
dc.contributor.authorNesvadba, N.
dc.contributor.authorOgle, P.
dc.contributor.authorSajina, A.
dc.contributor.authorVernet, J.
dc.contributor.authorZirm, A.
dc.date.accessioned2017-01-30T12:59:10Z
dc.date.available2017-01-30T12:59:10Z
dc.date.created2016-01-18T20:00:48Z
dc.date.issued2013
dc.date.submitted2016-01-19
dc.identifier.citationRawlings, J. and Seymour, N. and Page, M. and De Breuck, C. and Stern, D. and Symeonidis, M. and Appleton, P. et al. 2013. Polycyclic aromatic hydrocarbon emission in powerful high-redshift radio galaxies. Monthly Notices of the Royal Astronomical Society. 429 (1): pp. 744-756.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/27457
dc.identifier.doi10.1093/mnras/sts368
dc.description.abstract

We present the mid-infrared (IR) spectra of seven of the most powerful radio-galaxies known to exist at 1.5 < z < 2.6. The radio emission of these sources is dominated by the AGN with 500 MHz luminosities in the range 1027.8–1029.1 W Hz−1. The AGN signature is clearly evident in the mid-IR spectra; however, we also detect polycyclic aromatic hydrocarbon emission, indicative of prodigious star formation at a rate of up to ∼1000 M⊙ yr−1. Interestingly, we observe no significant correlation between AGN power and star formation in the host galaxy. We also find most of these radio galaxies to have weak 9.7 μm silicate absorption features (τ9.7 μm < 0.8) which implies that their mid-IR obscuration is predominantly due to the dusty torus that surrounds the central engine, rather than the host galaxy. The tori are likely to have an inhomogeneous distribution with the obscuring structure consisting of individual clouds. We estimate that these radio galaxies have already formed the bulk of their stellar mass and appear to lie at a stage in their evolution where the obscured AGN dominates the energy output of the system but star formation is also prevalent.

dc.titlePolycyclic aromatic hydrocarbon emission in powerful high-redshift radio galaxies
dc.typeJournal Article
dcterms.dateSubmitted2016-01-19
dcterms.source.volume429
dcterms.source.number1
dcterms.source.startPage744
dcterms.source.endPage756
dcterms.source.issn0035-8711
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.digitool.pid236228
curtin.note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

curtin.pubStatusPublished
curtin.refereedTRUE
curtin.departmentDepartment of Physics and Astronomy
curtin.identifier.scriptidPUB-VC-ORD-SA-28863
curtin.identifier.elementsidELEMENTS-116421
curtin.accessStatusOpen access


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