Far-infrared photometry of OJ 287 with the Herschel Space Observatory

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Kidger, Mark
dc.contributor.author Zola, Staszek
dc.contributor.author Valtonen, Mauri
dc.contributor.author Lähteenmäki, Anne
dc.contributor.author Järvelä, Emilia
dc.contributor.author Tornikoski, Merja
dc.contributor.author Tammi, Joni
dc.contributor.author Liakos, Alexis
dc.contributor.author Poyner, Gary
dc.date.accessioned 2018-04-04T09:37:27Z
dc.date.available 2018-04-04T09:37:27Z
dc.date.issued 2018-02-01
dc.identifier.citation Kidger , M , Zola , S , Valtonen , M , Lähteenmäki , A , Järvelä , E , Tornikoski , M , Tammi , J , Liakos , A & Poyner , G 2018 , ' Far-infrared photometry of OJ 287 with the Herschel Space Observatory ' Astronomy and Astrophysics , vol 610 , A74 . DOI: 10.1051/0004-6361/201732142 en
dc.identifier.issn 0004-6361
dc.identifier.issn 1432-0746
dc.identifier.other PURE UUID: 688fdd8a-43e4-48e6-a1d0-cb43864b42f6
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/farinfrared-photometry-of-oj-287-with-the-herschel-space-observatory(688fdd8a-43e4-48e6-a1d0-cb43864b42f6).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85043301874&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/18434604/kidger_et_al_aa32142_17.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/30580
dc.description.abstract Context. The blazar OJ 287 has shown a ≈ 12 year quasi-periodicity over more than a century, in addition to the common properties of violent variability in all frequency ranges. It is the strongest known candidate to have a binary singularity in its central engine. Aim. We aim to better understand the different emission components by searching for correlated variability in the flux over four decades of frequency measurements. Methods. We combined data at frequencies from the millimetric to the visible to characterise the multifrequency light curve in April and May 2010. This includes the only photometric observations of OJ 287 made with the Herschel Space Observatory: five epochs of data obtained over 33 days at 250, 350, and 500 μm with Herschel-SPIRE. Results. Although we find that the variability at 37 GHz on timescales of a few weeks correlates with the visible to near-IR spectral energy distribution, there is a small degree of reddening in the continuum at lower flux levels that is revealed by the decreasing rate of decline in the light curve at lower frequencies. However, we see no clear evidence that a rapid flare detected in the light curve during our monitoring in the visible to near-IR light curve is seen either in the Herschel data or at 37 GHz, suggesting a low-frequency cut-off in the spectrum of such flares. Conclusions. We see only marginal evidence of variability in the observations with Herschel over a month, although this may be principally due to the poor sampling. The spectral energy distribution between 37 GHz and the visible can be characterised by two components of approximately constant spectral index: a visible to far-IR component of spectral index α = -0.95, and a far-IR to millimetric spectral index of α = -0.43. There is no evidence of an excess of emission that would be consistent with the 60 μmdust bump found in many active galactic nuclei. en
dc.format.extent 7
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Astronomy and Astrophysics en
dc.relation.ispartofseries Volume 610 en
dc.rights openAccess en
dc.subject.other Astronomy and Astrophysics en
dc.subject.other Space and Planetary Science en
dc.subject.other 115 Astronomy and space science en
dc.title Far-infrared photometry of OJ 287 with the Herschel Space Observatory en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department European Space Astronomy Centre
dc.contributor.department Jagiellonian University in Kraków
dc.contributor.department University of Turku
dc.contributor.department Metsähovi Radio Observatory
dc.contributor.department National Observatory of Athens
dc.contributor.department British Astronomical Association
dc.contributor.department Department of Electronics and Nanoengineering en
dc.subject.keyword BL Lacertae objects
dc.subject.keyword Galaxies
dc.subject.keyword Individual
dc.subject.keyword OJ 287
dc.subject.keyword Astronomy and Astrophysics
dc.subject.keyword Space and Planetary Science
dc.subject.keyword 115 Astronomy and space science
dc.identifier.urn URN:NBN:fi:aalto-201804042043
dc.identifier.doi 10.1051/0004-6361/201732142
dc.type.version publishedVersion

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