J/A+A/610/A74ivo://CDS.VizieR/J/A+A/610/A74doi:10.26093/cds/vizier.36100074CDSKidger M.Zola S.Valtonen M.Laehteenmaeki A.Jaervelae E.,Tornikoski M.Tammi J.Liakos A.Poyner G.2018-03-15T09:23:35Z2018-03-05T06:39:12ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomyWide-band photometrymillimeter-astronomyphotometrysubmillimeter-astronomyThe 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. We aim to better understand the different emission components by searching for correlated variability in the flux over four decades of frequency measurements. 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 500um with Herschel-SPIRE. Although we find that the variability at 37GHz on timescales of a few weeks correlates with the visible to near-IR spectral energy distribution (SED), 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 37GHz, suggesting a low-frequency cut-off in the spectrum of such flares. 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 {alpha}=-0.95, and a far-IR to millimetric spectral index of {alpha}=0.43. There is no evidence of an excess of emission that would be consistent with the 60um dust bump found in many active galactic nuclei.2018A&A...610A..74Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/610/A74CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/129/569 : BVRI photometry of OJ 287 (Jia Guibin+ 1998)J/AJ/132/1256 : eim BATC photometry of OJ 287 (Wu+, 2006)J/MNRAS/385/823 : UBVRI light curves of OJ 287 (Zheng+, 2008)J/MNRAS/402/2087 : Optical polarization of OJ 287 in 2005-09 (Villforth+, 2010)J/AJ/141/65 : BATC ceimo light curves of OJ 287 (Dai+, 2011)J/ApJ/764/5 : BR photometry of 2012 precursor flare in OJ287J/ApJ/835/275 : OJ 287 flux + polarization during 2016 outburstJ/A+A/597/A80 : GMVA 86GHz images of OJ 287 (Hodgson+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/610/A74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/610/A74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/610/A74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/610/A74https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/610/A74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/610/A74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.4516457410139638e-23 4.920466254354166e-19OpticalInfraredRadiodefaultJ/A+A/610/A74/photomPhotometry of blazar OJ287recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD-37[55303.2/55356.3]? Observation MJD for 37GHzdtime.epochdoublenullableF37GHz? Metsahovi 37GHz fluxJyphot.flux.density;em.mm.30-50GHzfloatnullablee_F37GHz? rms uncertainty on F37GHzJystat.errorfloatnullableObs-37Observatory from which 37GHz data where obtainedmeta.id;instr.obstycharMJD-500[55307.2/55340.1]? Observation MJD for 500, 350 and 250umdtime.epochdoublenullableF500um? Herschel 500um fluxJyphot.flux.density;em.mm.400-750GHzfloatnullablee_F500um? rms uncertainty on F500umJystat.errorfloatnullableF350um? Herschel 350um fluxJyphot.flux.density;em.mm.750-1500GHzfloatnullablee_F350um? rms uncertainty on F350umJystat.errorfloatnullableF250um? Herschel 250um fluxJyphot.flux.density;em.mm.750-1500GHzfloatnullablee_F250um? rms uncertainty on F250umJystat.errorfloatnullableObs-500Observatory from which 250-500um data where obtainedmeta.id;instr.obstycharMJD-K[55282.6/55348.5]? Observation MJD for K-banddtime.epochdoublenullableKmag? SMARTS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.KfloatnullableObs-KObservatory from which K-band data where obtainedmeta.id;instr.obstycharMJD-J[55282.6/55348.5]? Observation MJD for J-banddtime.epochdoublenullableJmag? SMARTS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableObs-JObservatory from which J-band data where obtainedmeta.id;instr.obstycharMJD-R[55288.2/55349.5] Observation MJD for R-banddtime.epochdoubleRmag[14.014/15.094] R magnitudemagphot.mag;em.opt.Rfloate_Rmagrms uncertainty on Rmagmagstat.error;phot.mag;em.opt.RfloatObs-RObservatory from which R-band data where obtainedmeta.id;instr.obstycharMJD-V[55282.6/55348.5]? Observation MJD for V-bandtime.epochdoublenullableVmag? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatnullableObs-VObservatory from which V-band data where obtainedmeta.id;instr.obstycharMJD-B[55282.6/55348.5]? Observation MJD for B-banddtime.epochdoublenullableBmag? SMARTS B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? rms uncertainty on Bmagmagstat.error;phot.mag;em.opt.BfloatnullableObs-BObservatory from which B-band data where obtainedmeta.id;instr.obstychar