J/ApJS/237/30ivo://CDS.VizieR/J/ApJS/237/30doi:10.26093/cds/vizier.22370030CDSMeng N.Zhang X.Wu J.Ma J.Zhou Xu2019-01-08T14:58:04Z2018-11-15T14:28:15ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsquasarsphotometryvisible-astronomyspectroscopyWe carried out multi-color optical monitoring of a sample of 10 blazars from 2005 to 2011. The sample contains 3 LBLs, 2 IBLs, 4 HBLs, and 1 FSRQ. Our monitoring focused on the long-term variability and the sample included nine BL Lac objects and one flat-spectrum radio quasar (FSRQ). A total of 14,799 data points were collected. This is one of the largest optical databases for a sample of 10 blazars. All objects showed significant variability except for OT 546. Because of the low sampling on each single night, only BL Lacertae were observed to have intraday variability on 2006 November 6. Most BL Lac objects showed a bluer-when-brighter (BWB) chromatism, while the FSRQ, 3C 454.3, displayed a redder-when-brighter trend. The BWB color behaviors of most BL Lacs can be at least partly attributed to the trend of increasing variation amplitude with increasing frequency observed in these objects. The average spectral index of LBLs is around 1.5, as expected from the model dominated by synchrotron self-Compton loss. The optical emission of HBL is probably contaminated by the thermal emission from the host galaxies. Correlation analysis did not reveal any time delay between variations at different wavelengths.2018ApJS..237...30Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/237/30CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/109/267 : Radio to X-Ray distribution of BL Lac Objects (Giommi+, 1995)J/AJ/112/628 : BATC Color Survey of M67 (Fan+ 1996)J/A+AS/130/109 : BV(RI)c photometry of ON 231 (Tosti+ 1998)J/ApJ/537/101 : Optical Study for blazars. I. (Fan+, 2000)J/A+AS/143/357 : Tuorla Quasar Monitoring (Katajainen+ 2000)J/A+AS/144/481 : BVRI photometry of 5 X-ray selected BL Lacs (Villata+, 2000)J/A+A/395/11 : BV(RI)c photometry of ON 231 during outburst (Tosti+, 2002)J/A+A/397/361 : 15-color BATC photometry of Landolt SA95 field (Zhou+, 2003)J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)J/MNRAS/373/209 : BATC eim photometry of BL Lac (Hu+, 2006)J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/ApJ/712/405 : Multiwavelength obs. of 3C 454.3 III. (Vercellone+, 2010)J/ApJS/192/12 : Photometry of the blazar PKS 0537-441 (Impiombato+, 2011)J/AJ/143/108 : B'V'R' photom. of the BL Lac object S5 0716+714 (Wu+, 2012)J/A+A/562/A79 : Variability of 7 blazars in six bands (Sandrinelli+, 2014)J/ApJS/218/18 : 2004-2012 BVRI obs. of blazar S5 0716+714 (Dai+, 2015)J/AJ/150/67 : Optical photometry for 1ES 1959+650 (Yuan+, 2015)J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/237/30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/237/30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/237/30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/237/30https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/237/30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/237/30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/237/30/blazars (Observation details of the 10 objects (table 2) and Galactic extinction in each band (table 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/237/30/blazars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/237/30/blazars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/237/30/blazars?GETtext/xml+votable180.050000true35.665041743.03550.0055555555555555566/2414 4770 5423 9711 13927 15969 20099 22363 28492 31663https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/237/30?format=asciiOpticaldefaultJ/ApJS/237/30/blazarsObservation details of the 10 objects (table 2) and Galactic extinction in each band (table 4)NameBlazar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_Name[1/2]? Phase numbermeta.noteintnullableRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainz[0.03/0.9] Redshiftsrc.redshiftfloatTypeBlazar type (flat-spectrum radio quasar or BL Lac object with high-, intermediate-, or low-frequency-peak)src.classcharBandObservation band (see the "Description" section above for the central wavelengths)instr.bandpass;obscharStdateStart UT datetime.startnullableEnddateEnd UT datetime.endnullableNd[5/248] Number of observing daysmeta.numberintNdata[23/1790] Number of measurementsmeta.numberintNpNumber of photometry measurements for this blazar (link to lc)meta.numberintnullableAc[0.08/1.3]? c-band extinctionmagphys.absorptionfloatnullableAe[0.06/1.1]? e-band extinctionmagphys.absorptionfloatnullableAi[0.04/0.7]? i-band extinctionmagphys.absorptionfloatnullableAm[0.03/0.5]? m-band extinctionmagphys.absorptionfloatnullableAo[0.02/0.4]? o-band extinctionmagphys.absorptionfloatnullableANameAbbreviated name as used in lc.dat; column added by CDSmeta.idcharprimaryLCInteractive Plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJS/237/30/lcLight curves for all 36 observations of the blazars (compilation from the separated files in apjsaacffet3_mrt.tar.gz, by CDS)ObsUT observation datestime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintANameBlazar designationmeta.id;meta.maincharBandObservation band (c, e, i, m or o); see the "Description" section aboveinstr.bandpass;obscharJDJulian Observation datedtime.epochdoubleExp[20/900] Exposure timestime.duration;obs.exposureintmag[0.3/17.8] Observation magnitude in Bandmagphot.magfloate_mag[0/0.5] Uncertainty in magmagstat.error;phot.magfloatdfmag[-0.3/0.7] Differential magnitude of the check starmagphot.mag;arith.difffloat