J/ApJS/222/24ivo://CDS.VizieR/J/ApJS/222/24doi:10.26093/cds/vizier.22220024CDSXiong D.Zhang H.Zhang X.Yi T.Bai J.Wang F.Liu H.Zhen Y.2017-07-06T06:26:19Z2016-04-04T11:47:32ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomyphotometryWe have monitored the BL Lac object Mrk 501 in the optical V, R, and I bands from 2010 to 2015. For Mrk 501, the presence of a strong host galaxy component can affect the results of photometry. After subtracting the host galaxy contributions, the source shows intraday and long-term variabilities for optical flux and color indices. The average variability amplitudes of the V, R, and I bands are 22.05%, 22.25%, and 23.82%, respectively, and the value of the duty cycle is 14.87%. A minimal variability timescale of 106 minutes is detected. No significant time lag between the V and I bands is found on one night. The bluer-when-brighter (BWB) trend is dominant for Mrk 501 on intermediate, short, and intraday timescales, which supports the shock-in-jet model. For the long timescale, Mrk 501, in different states, can have different BWB trends. The corresponding results for non-correcting host galaxy contributions are also presented. We have monitored the BL Lac object Mrk 501 in the optical V, R, and I bands from 2010 to 2015. For Mrk 501, the presence of a strong host galaxy component can affect the results of photometry. After subtracting the host galaxy contributions, the source shows intraday and long-term variabilities for optical flux and color indices. The average variability amplitudes of the V, R, and I bands are 22.05%, 22.25%, and 23.82%, respectively, and the value of the duty cycle is 14.87%. A minimal variability timescale of 106 minutes is detected. No significant time lag between the V and I bands is found on one night. The bluer-when-brighter (BWB) trend is dominant for Mrk 501 on intermediate, short, and intraday timescales, which supports the shock-in-jet model. For the long timescale, Mrk 501, in different states, can have different BWB trends. The corresponding results for non-correcting host galaxy contributions are also presented.2016ApJS..222...24Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/222/24CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/218/18 : 2004-2012 BVRI observations of blazar S5 0716+714 (Dai+, 2015)J/A+A/573/A50 : Multiwavelength obs. of Mrk 501 in 2008 (Aleksic+, 2015)J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)J/ApJS/207/16 : BL Lac candidates for TeV observations (Massaro+, 2013)J/MNRAS/435/1300 : Intranight optical variability of AGN (Goyal+, 2013)J/A+A/537/A99 : Large Quasar Astrometric Catalogue 2 (LQAC-2) (Souchay+, 2012)J/AJ/143/108 : B'V'R' photometry of the BL Lac object S5 0716+714 (Wu+, 2012)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/ApJ/741/30 : Radio/{gamma}-ray correlation in AGN (Ackermann+, 2011)J/ApJ/722/L7 : Fermi/LAT detected MOJAVE AGNs (Pushkarev+, 2010)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)J/ApJ/700/597 : FERMI LAT detected blazars (Abdo+, 2009)J/A+A/495/691 : Multifrequency catalog of blazars, Roma-BZCAT (Massaro+, 2009)J/MNRAS/385/823 : UBVRI light curves of OJ 287 (Zheng+, 2008)J/A+A/472/699 : ROXA: large multi-frequency blazar sample (Turriziani+, 2007)J/A+A/466/63 : VLBI observations of BL Lac objects (Wu+, 2007)J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)J/A+AS/116/403 : VRI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996)J/A+AS/109/267 : Radio to X-Ray distribution of BL Lac Objects (Giommi+, 1995)J/A+AS/98/393 : 1Jy BL Lac Objects: Observational Data (Stickel+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/222/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/222/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/222/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/222/24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/222/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/222/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap1.9821045660507152e-19 3.852589004194616e-19InfraredOpticaldefaultJ/ApJS/222/24/table3Data of R BandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of the Observationtime.epochnullableMJD[55287.7/57167.9] Modified Julian Date of the observationdtime.epochdoubleRmag[13/13.8] R band magnitudemagphot.mag;em.opt.Rfloate_Rmag[0.007/0.05] RMS uncertainty in Rmagmagstat.error;phot.mag;em.opt.RfloatFhost[4.4/13.5] Host galaxy fluxmJyphot.flux.densityfloatJ/ApJS/222/24/table4Data of V BandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of the Observationtime.epochnullableMJD[55287.7/57167.9] Modified Julian Date of the observationdtime.epochdoubleVmag[13.5/14.2] V band magnitudemagphot.mag;em.opt.Vfloate_Vmag[0.009/0.05] RMS uncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatFhost[4.4/14] Host galaxy fluxmJyphot.flux.densityfloatJ/ApJS/222/24/table2Data of I BandFhost[4.4/14] Host galaxy fluxmJyphot.flux.densityfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of the Observationtime.epochnullableMJD[55287.7/57167.9] Modified Julian Date of the observationdtime.epochdoubleImag[12.3/13.1] I band magnitudemagphot.mag;em.opt.Ifloate_Imag[0.008/0.05] RMS uncertainty in Imagmagstat.error;phot.mag;em.opt.Ifloat