J/A+A/371/79ivo://CDS.VizieR/J/A+A/371/79doi:10.26093/cds/vizier.33710079CDSDietrich M.Bender C.F.Bergmann D.J.Bills T.E.Bochkarev N.G.,Burenkov A.N.Gaskell C.M.Gutzmer D.D.Grove R.Hiller M.E.,Huchra J.P.Klimek E.S.Lund C.Merkulova N.I.Pebley S.Poulsen M.A.,Pronik V.I.Sergeev S.G.Sergeev E.A.Shapovalova A.I.Vlasyuk V.V.,Wilkes B.2017-06-22T14:28:32Z2001-05-19T16:08:48ZCDS support team

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

cds-question@unistra.frseyfert-galaxiesinfrared-photometryvisible-astronomybroad-band-photometryspectroscopyResults of a ground-based optical monitoring campaign on NGC 5548 in June 1998 are presented. The broad-band fluxes (U, B, V), and the spectrophotometric optical continuum flux F_{lambda}_ (5100{AA}) monotonically decreased in flux while the broad-band R and I fluxes and the integrated emission-line fluxes of H{alpha} and H{beta} remained constant to within 5%. On June 22, a short continuum flare was detected in the broad band fluxes. It had an amplitude of about ~18% and it lasted only =~90 min. The broad band fluxes and the optical continuum F_{lambda}_ (5100{AA}) appear to vary simultaneously with the EUV variations. No reliable delay was detected for the broad optical emission lines in response to the EUVE variations. Narrow H{beta} emission features predicted as a signature of an accretion disk were not detected during this campaign. However, there is marginal evidence for a faint feature at {lambda}=~4962{AA} with FWHM=~6{AA} redshifted by {Delta}v=~1100km/s with respect to H{beta}_narrow_.2001A&A...371...79Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/371/79CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/510/659 : Size and Structure of AGN in NGC 5548 (Peterson+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/371/79https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/371/79http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/371/79https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/371/79https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/371/79http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/371/79GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+A/371/79/table1alog of the photometric observations. The flux of the broad band fluxes is given in units of [10^-15erg/s/cm^2^/{AA}]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation datetime.epochnullableHJDHeliocentric Julian date of observationdtime.epochdoubleCode[DQ] Code (G1)meta.code;obscharUmag? U magnitude1e-17W.m**-2.nm**-1phot.mag;em.opt.Ufloatnullablee_Umag? rms uncertainty on Umag1e-17W.m**-2.nm**-1stat.errorfloatnullableBmag? B magnitude1e-17W.m**-2.nm**-1phot.mag;em.opt.Bfloatnullablee_Bmag? rms uncertainty on Bmag1e-17W.m**-2.nm**-1stat.errorfloatnullableVmagV magnitude1e-17W.m**-2.nm**-1phot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmag1e-17W.m**-2.nm**-1stat.errorfloatRmag? R magnitude1e-17W.m**-2.nm**-1phot.mag;em.opt.Rfloatnullablee_Rmag? rms uncertainty on Rmag1e-17W.m**-2.nm**-1stat.errorfloatnullableImag? I magnitude1e-17W.m**-2.nm**-1phot.mag;em.opt.Ifloatnullablee_Imag? rms uncertainty on Imag1e-17W.m**-2.nm**-1stat.errorfloatnullableJ/A+A/371/79/table2alog of the spectroscopic observationsTintIntegration timestime.duration;obs.exposureintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation datetime.epochnullableMiddleJulian date of middle of observationdtime.epochdoubleCodeCode (G1)meta.code;obscharlinfLower limit of spectroscopic rangenminstr.bandwidthfloatlsupUpper limit of spectroscopic rangenminstr.bandwidthfloatAper1Aperturearcsecinstr.fovfloatAper2Aperturearcsecinstr.fovfloatPAPosition angledegpos.posAngintSeeingSeeingarcsecinstr.obsty.seeingfloatRes? Resolution0.1nmspect.resolutionfloatnullableRes2? Upper limit of resolution when interval0.1nmspect.resolutionintnullableFilenameFilename of the observationmeta.id;meta.filecharJ/A+A/371/79/table3aEmission line and continuum flux measurements.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation datetime.epochnullableHJDHeliocentric Julian date of observationdtime.epochdoubleCodeCode (G1)meta.code;obscharFl5100? Continuum flux (1)1e-17W.m**-2.nm**-1phot.fluxfloatnullablee_Fl5100? rms uncertainty on Fl5100 (1)1e-17W.m**-2.nm**-1stat.errorfloatnullableFHbeta? H{beta} emission line flux (2)1e-16W.m**-2phot.fluxfloatnullablee_FHbeta? rms uncertainty on FHbeta (2)1e-16W.m**-2stat.errorfloatnullableFHalpha? H{alpha} emission line flux (2)1e-16W.m**-2phot.fluxfloatnullablee_FHalpha? rms uncertainty on FHalpha (2)1e-16W.m**-2stat.errorfloatnullable