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Wide-field LOFAR imaging of the field around the double-double radio galaxy B1834+620 A fresh view on a restarted AGN and doubeltjes

Orrù, E; van Velzen, S; Pizzo, R; Yatawatta, S; Paladino, R.A.; Iacobelli, M; Murgia, M; Falcke, H; Morganti, Raffaella; de Bruyn, A.G.; Butcher, Harvey; Bonafede, A; Bernardi, G; Breitling, F; Ciardi, Benedetta; Engels, Dieter; Hoeft, M; Intema, Huib T; Miley, George; Reich, W; Shulevski, Alexander; Vocks, Christian; Brüggen, M; Mann, Gottfried

Description

Context. The existence of double-double radio galaxies (DDRGs) is evidence for recurrent jet activity in active galactic nuclei (AGN), as expected from standard accretion models. A detailed study of these rare sources provides new perspectives for investigating the AGN duty cycle, AGN-galaxy feedback, and accretion mechanisms. Large catalogues of radio sources, on the other hand, provide statistical information about the evolution of the radio-loud AGN population out to high redshifts. Aims....[Show more]

dc.contributor.authorOrrù, E
dc.contributor.authorvan Velzen, S
dc.contributor.authorPizzo, R
dc.contributor.authorYatawatta, S
dc.contributor.authorPaladino, R.A.
dc.contributor.authorIacobelli, M
dc.contributor.authorMurgia, M
dc.contributor.authorFalcke, H
dc.contributor.authorMorganti, Raffaella
dc.contributor.authorde Bruyn, A.G.
dc.contributor.authorButcher, Harvey
dc.contributor.authorBonafede, A
dc.contributor.authorBernardi, G
dc.contributor.authorBreitling, F
dc.contributor.authorCiardi, Benedetta
dc.contributor.authorEngels, Dieter
dc.contributor.authorHoeft, M
dc.contributor.authorIntema, Huib T
dc.contributor.authorMiley, George
dc.contributor.authorReich, W
dc.contributor.authorShulevski, Alexander
dc.contributor.authorVocks, Christian
dc.contributor.authorBrüggen, M
dc.contributor.authorMann, Gottfried
dc.date.accessioned2018-11-29T22:52:07Z
dc.date.available2018-11-29T22:52:07Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/152083
dc.description.abstractContext. The existence of double-double radio galaxies (DDRGs) is evidence for recurrent jet activity in active galactic nuclei (AGN), as expected from standard accretion models. A detailed study of these rare sources provides new perspectives for investigating the AGN duty cycle, AGN-galaxy feedback, and accretion mechanisms. Large catalogues of radio sources, on the other hand, provide statistical information about the evolution of the radio-loud AGN population out to high redshifts. Aims. Using wide-field imaging with the LOFAR telescope, we study both a well-known DDRG as well as a large number of radio sources in the field of view. Methods. We present a high resolution image of the DDRG B1834+620 obtained at 144 MHz using LOFAR commissioning data. Our image covers about 100 square degrees and contains over 1000 sources. Results. The four components of the DDRG B1834+620 have been resolved for the first time at 144 MHz. Inner lobes were found to point towards the direction of the outer lobes, unlike standard FR II sources. Polarized emission was detected at +60 rad m-2 in the northern outer lobe. The high spatial resolution allows the identification of a large number of small double-lobed radio sources; roughly 10% of all sources in the field are doubles with a separation smaller than 1′. Conclusions. The spectral fit of the four components is consistent with a scenario in which the outer lobes are still active or the jets recently switched off, while emission of the inner lobes is the result of a mix-up of new and old jet activity. From the presence of the newly extended features in the inner lobes of the DDRG, we can infer that the mechanism responsible for their formation is the bow shock that is driven by the newly launched jet. We find that the density of the small doubles exceeds the density of FR II sources with similar properties at 1.4 GHz, but this difference becomes smaller for low flux densities. Finally, we show that the significant challenges of wide-field imaging (e.g., time and frequency variation of the beam, directional dependent calibration errors) can be solved using LOFAR commissioning data, thus demonstrating the potential of the full LOFAR telescope to discover millions of powerful AGN at redshift z ~ 1.
dc.format.mimetypeapplication/pdf
dc.publisherSpringer
dc.sourceAstronomy and Astrophysics
dc.titleWide-field LOFAR imaging of the field around the double-double radio galaxy B1834+620 A fresh view on a restarted AGN and doubeltjes
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume584
dc.date.issued2015
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationU3488905xPUB8400
local.type.statusPublished Version
local.contributor.affiliationOrrù, E, Netherlands Institute for Radio Astronomy
local.contributor.affiliationvan Velzen, S, Radboud University Nijmegen
local.contributor.affiliationPizzo, R, Netherlands Institute for Radio Astronomy (ASTRON)
local.contributor.affiliationYatawatta, S, Netherlands Institute for Radio Astronomy (ASTRON)
local.contributor.affiliationPaladino, R.A., University of Bologna
local.contributor.affiliationIacobelli, M, Netherlands Institute for Radio Astronomy
local.contributor.affiliationMurgia, M, Obsservatorio Astronomico di Cagliari
local.contributor.affiliationFalcke, H, ASTRON Dwingeloo
local.contributor.affiliationMorganti, Raffaella, Netherlands Foundation for Research in Astronomy
local.contributor.affiliationde Bruyn, A.G., Kapteyn Astronomical Institute
local.contributor.affiliationButcher, Harvey, College of Science, ANU
local.contributor.affiliationBonafede, A, University of Hamburg
local.contributor.affiliationBernardi, G, Harvard-Smithsonian Center for Astrophysics
local.contributor.affiliationBreitling, F, Leibniz-Institut für Astrophysik Potsdam (AIP)
local.contributor.affiliationCiardi, Benedetta, Max-Planck-Institute for Astrophysics
local.contributor.affiliationEngels, Dieter, Hamburger Sternwarte
local.contributor.affiliationHoeft, M, Thuringer Landessternwarte
local.contributor.affiliationIntema, Huib T, National Radio Astronomy Observatory
local.contributor.affiliationMiley, George, Leiden University
local.contributor.affiliationReich, W, Max-Planck-Institut für Radioastronomie
local.contributor.affiliationShulevski, Alexander, Kapteyn Astronomical Institute
local.contributor.affiliationVocks, Christian, Leibniz-Institut fur Astrophysik Potsdam (AIP)
local.contributor.affiliationBrüggen, M, Universtat Hamburg
local.contributor.affiliationMann, Gottfried, Leibniz-Institut fur Astrophysik Potsdam (AIP)
local.bibliographicCitation.startpageA112/1
local.bibliographicCitation.lastpage12
local.identifier.doi10.1051/0004-6361/201526501
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2018-11-29T07:43:44Z
local.identifier.scopusID2-s2.0-84948954608
local.identifier.thomsonID000366936800112
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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