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37 GHz observations of narrow-line Seyfert 1 galaxies

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Lähteenmäki, A.
dc.contributor.author Järvelä, E.
dc.contributor.author Hovatta, T.
dc.contributor.author Tornikoski, M.
dc.contributor.author Harrison, D.L.
dc.contributor.author López-Caniego, M.
dc.contributor.author Max-Moerbeck, W.
dc.contributor.author Mingaliev, M.
dc.contributor.author Pearson, T. J.
dc.contributor.author Ramakrishnan, V.
dc.contributor.author Readhead, A.C.S.
dc.contributor.author Reeves, Rodrigo A.
dc.contributor.author Richards, J. L.
dc.contributor.author Sotnikova, Y.
dc.contributor.author Tammi, J.
dc.date.accessioned 2017-10-13T10:32:35Z
dc.date.available 2017-10-13T10:32:35Z
dc.date.issued 2017-07-01
dc.identifier.citation Lähteenmäki , A , Järvelä , E , Hovatta , T , Tornikoski , M , Harrison , D L , López-Caniego , M , Max-Moerbeck , W , Mingaliev , M , Pearson , T J , Ramakrishnan , V , Readhead , A C S , Reeves , R A , Richards , J L , Sotnikova , Y & Tammi , J 2017 , ' 37 GHz observations of narrow-line Seyfert 1 galaxies ' , Astronomy and Astrophysics , vol. 603 , A100 . https://doi.org/10.1051/0004-6361/201630257 en
dc.identifier.issn 0004-6361
dc.identifier.issn 1432-0746
dc.identifier.other PURE UUID: 2f7699d9-e51a-44d7-9f6d-1934d43e829c
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/2f7699d9-e51a-44d7-9f6d-1934d43e829c
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85024406359&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/14451047/37_GHz_observations_of_narrow_line_Seyfert_1_galaxies_aa30257_16.log
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/28143
dc.description.abstract Observations performed at Metsähovi Radio Observatory at 37 GHz are presented for a sample of 78 radio-loud and radio-quiet narrow-line Seyfert 1 (NLS1) galaxies, together with additional lower and higher frequency radio data from RATAN-600, Owens Valley Radio Observatory, and the Planck satellite. Most of the data have been gathered between February 2012 and April 2015 but for some sources even longer light curves exist. The detection rate at 37 GHz is around 19%, which is comparable to other populations of active galactic nuclei presumed to be faint at radio frequencies, such as BL Lac objects. Variability and spectral indices are determined for sources with enough detections. Based on the radio data, many NLS1 galaxies show a blazar-like radio spectra exhibiting significant variability. The spectra at a given time are often inverted or convex. The source of the high-frequency radio emission in NLS1 galaxies, detected at 37 GHz, is most probably a relativistic jet rather than star formation. Jets in NLS1 galaxies are therefore expected to be a much more common phenomenon than earlier assumed. en
dc.format.extent 26
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Astronomy and Astrophysics en
dc.relation.ispartofseries Volume 603 en
dc.rights openAccess en
dc.title 37 GHz observations of narrow-line Seyfert 1 galaxies en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Electronics and Nanoengineering
dc.contributor.department Metsähovi Radio Observatory
dc.contributor.department University of Cambridge
dc.contributor.department European Space Astronomy Centre
dc.contributor.department Max Planck Institute for Radio Astronomy
dc.contributor.department Special Astrophysical Observatory of the Russian Academy of Sciences
dc.contributor.department California Institute of Technology
dc.contributor.department Universidad de Concepción
dc.contributor.department Kazan Federal University
dc.subject.keyword Galaxies: active
dc.subject.keyword Galaxies: Seyfert
dc.identifier.urn URN:NBN:fi:aalto-201710137004
dc.identifier.doi 10.1051/0004-6361/201630257
dc.type.version publishedVersion

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