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AGN duty cycle estimates for the ultra-steep spectrum radio relic VLSS J1431.8+1331

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AGN duty cycle estimates for the ultra-steep spectrum radio relic VLSS J1431.8+1331

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dc.contributor.author Shulevski, A. pl
dc.contributor.author Morganti, R. pl
dc.contributor.author Barthel, P. D. pl
dc.contributor.author Harwood, J. J. pl
dc.contributor.author Brunetti, G. pl
dc.contributor.author van Weeren, R. J. pl
dc.contributor.author Röttgering, H. J. A. pl
dc.contributor.author White, G. J. pl
dc.contributor.author Horellou, C. pl
dc.contributor.author Kunert-Bajraszewska, M. pl
dc.contributor.author Jamrozy, Marek [SAP11016371] pl
dc.contributor.author Chyży, Krzysztof [SAP11011785] pl
dc.contributor.author Mahony, E. pl
dc.contributor.author Miley, G. pl
dc.contributor.author Brienza, M. pl
dc.contributor.author Bîrzan, L. pl
dc.contributor.author Rafferty, D. A. pl
dc.contributor.author Brüggen, M. pl
dc.contributor.author Wise, M. W. pl
dc.contributor.author Conway, J. pl
dc.contributor.author de Gasperin, F. pl
dc.contributor.author Vilchez, N. pl
dc.date.accessioned 2015-11-20T10:18:07Z
dc.date.available 2015-11-20T10:18:07Z
dc.date.issued 2015 pl
dc.identifier.issn 0004-6361 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/16969
dc.language eng pl
dc.rights Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa *
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/pl/legalcode *
dc.title AGN duty cycle estimates for the ultra-steep spectrum radio relic VLSS J1431.8+1331 pl
dc.type JournalArticle pl
dc.description.additional Reproduced with permission from Astronomy & Astrophysics, © ESO pl
dc.abstract.en Context. Steep spectrum radio sources associated with active galactic nuclei (AGN) may contain remnants of past AGN activity episodes. Studying these sources gives us insight into the AGN activity history. Novel instruments like the LOw Frequency ARray (LOFAR) are enabling studies of these fascinating structures to be made at tens to hundreds of MHz with sufficient resolution to analyse their complex morphology. Aims: Our goal is to characterize the integrated and resolved spectral properties of VLSS J1431+1331 and estimate source ages based on synchrotron radio emission models, thus putting constraints on the AGN duty cycle. Methods: Using a broad spectral coverage, we have derived spectral and curvature maps, and used synchrotron ageing models to determine the time elapsed from the last time the source plasma was energized. We used LOFAR, Giant Metrewave Radio Telescope (GMRT) and Jansky Very Large Array (VLA) data. Results: We confirm the morphology and the spectral index values found in previous studies of this object. Based on our ageing analysis, we infer that the AGN that created this source currently has very low levels of activity or that it is switched off. The derived ages for the larger source component range from around 60 to 130 Myr, hinting that the AGN activity decreased or stopped around 60 Myr ago. We observe that the area around the faint radio core located in the larger source component is the youngest, while the overall age of the smaller source component shows it to be the oldest part of the source. Conclusions: Our analysis suggests that VLSS J1431.8+1331 is an intriguing, two-component source. The larger component seems to host a faint radio core, suggesting that the source may be an AGN radio relic. The spectral index we observe from the smaller component is distinctly flatter at lower frequencies than the spectral index of the larger component, suggesting the possibility that the smaller component may be a shocked plasma bubble. From the integrated source spectrum, we deduce that its shape and slope can be used as tracers of the activity history of this type of steep spectrum radio source. We discuss the implications this conclusion has for future studies of radio sources having similar characteristics. pl
dc.subject.en galaxies: active pl
dc.subject.en galaxies: individual: VLSS J1431.8+1331 pl
dc.subject.en radio continuum: galaxies pl
dc.description.volume 583 pl
dc.identifier.doi 10.1051/0004-6361/201525632 pl
dc.identifier.eissn 1432-0746 pl
dc.title.journal Astronomy & Astrophysics pl
dc.language.container eng pl
dc.affiliation Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne pl
dc.subtype Article pl
dc.identifier.articleid A89 pl
dc.rights.original OTHER; otwarte czasopismo; ostateczna wersja wydawcy; po opublikowaniu; 12 pl
dc.identifier.project ROD UJ / P pl
.pointsMNiSW [2015 A]: 35


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Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa Except where otherwise noted, this item's license is described as Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa