J/A+A/531/A123ivo://CDS.VizieR/J/A+A/531/A123doi:10.26093/cds/vizier.35310123CDSKastendieck M.A.Ashley M.C.B.Horns D.2017-07-03T14:25:54Z2011-07-01T16:43:42ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsphotometryThe long-term optical light curve of PKS 2155-304 is assembled from archival data as well as from so-far unpublished observations mostly carried out with the ROTSE-III and the ASAS robotic telescopes. A forward folding technique is used to determine the best-fit parameters for a model of a power law with a break in the power spectral density function (PSD). The best-fit parameters are estimated using a maximum-likelihood method with simulated light curves in conjunction with the Lomb-Scargle periodogram and the first-order structure function (SF). In addition, a new approach based upon the so-called multiple fragments variance function (MFVF) is introduced and compared to the other methods. Simulated light curves have been used to confirm the reliability of these methods as well as to estimate the uncertainties of the best-fit parameters.2011A&A...531A.123Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/531/A123CatalogResearchIsServedByTAP VizieR generic servicerelated-toIX/19 : X-ray lightcurves of bright AGNs from Ginga (Hayashida+ 1998)J/A+A/469/503 : VRIJHK observations of PKS 2155-304 (Dolcini+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/531/A123https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/531/A123http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/531/A123https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/531/A123https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/531/A123http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/531/A123GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/531/A123/photOptical light curve (R-band) of PKS 2155-304recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Datedtime.epochdoubleRmagApparent R-band magnitude (1)phot.mag;em.opt.Rfloate_Rmag1 {sigma} statistical uncertainty of Rmagstat.errorfloat