J/MNRAS/510/1791ivo://CDS.VizieR/J/MNRAS/510/1791doi:10.26093/cds/vizier.75101791CDSNegi V.Joshi R.Chand K.Chand H.Wiita P.Ho L.C.Singh R.S.2025-07-18T20:17:12Z2024-11-15T12:19:29ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsgalaxiesbl-lacertae-objectsradio-sourcesvisible-astronomytransient-sourcesphotometryspectroscopyclassificationredshiftedastrometryapparent-magnitudeWe investigate the temporal and colour variability of 897 blazars, comprising 455 BL Lacertae objects (BL Lacs) and 442 Flat Spectrum Radio Quasars (FSRQs), selected from the Roma-BZCAT catalogue, using the multiband light curves from the Zwicky Transient Facility (ZTF DR6) survey. Assessing the colour variability characteristics over ~2 yr time-scales, we found that 18.5 per cent (84 out of 455) BL Lacs showed a stronger bluer-when-brighter (BWB) trend, whereas 9.0 per cent (41 out of 455) showed a redder-when-brighter (RWB) trend. The majority (70 per cent) of the BL Lacs showing RWB are host galaxy dominated. For the FSRQ subclass, 10.2 per cent (45 out of 442) objects showed a strong BWB trend and 17.6 per cent (78 out of 442) showed a strong RWB trend. Hence, we find that BL Lacs more commonly follow a BWB trend than do FSRQs. This can be attributed to the more dominant jet emission in the case of BL Lacs and the contribution of thermal emission from the accretion disc for FSRQs. In analysing the colour behaviour on shorter time windows, we find many blazars evince shorter partial trends of BWB or RWB nature (or occasionally both). Some of such complex colour behaviours observed in the colour-magnitude diagrams of the blazars may result from transitions between the jet-dominated state and the disc-dominated state and vice versa.2022MNRAS.510.1791Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/510/1791CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015)IX/67 : Incremental Fermi LAT 4th source cat. (4FGL-DR3)J/ApJS/268/23 : Magnetic fields & emission regions of Fermi blazars (Fan+,2023)I/284 : The USNO-B1.0 Catalog (Monet+ 2003)J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)https://irsa.ipac.caltech.edu/Missions/ztf.html : ZTF DR6 home page datahttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/510/1791https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/510/1791http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/510/1791https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/510/1791https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/510/1791http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/510/1791GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/510/1791/table1 (*Basic parameters of our blazars sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/510/1791/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/510/1791/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/510/1791/table1?GETtext/xml+votable180.050000true342.523958338.41030830.0055555555555555566/0 47 128 201 376 398 438 447 514 532 567 600 611 615 716 851 911 975 988 1120 1546 1915 2087 2094 2098 2104 2140 2143 2228 2273 2280 2295 2334 2340 2394 2397 2414 2441 2448 2484 2549 2564 2610 2621 2647 2650 2671 2784 2792 2808 2844 2867 3023 3096 3431 3492 3569 3616 3820 3971 4098 4134 4140 4143 4150 4160 4229 4290 4312 4317 4405 4413 4475 4543 4550 4572 4621 4683 4695 4705 4770 4824 4841 4861 4863 4866 4882 4923 4964 4968 4974 4992 5072 5091 5098 5154 5156 5163 5191 5212 5222 5270 5284 5311 5352 5361 5371 5405 5413 5423 5432 5450 5455 5458 5462-5463 5483 5506 5510 5516 5522-5523 5529 5535-5536 5546 5552-5553 5567 5569 5574 5584 5597 5637 5676 5693 5698 5703 5717 5723 5758 5781 5784 5792 5801 5814 5817 5831 5844 5848 5858 5864 5870 5881 5914 5918 5929 5958 5984-5985 6014-6015 6018 6021 6025 6033 6067 6096 6104 6110 6115 6121 6132 6153 6212 6223 6234 6252 6255 6267 6377 6381 6386 6399 6406 6409 6427 6436 6448 6468 6477 6479 6515 6519 6526-6527 6534 6568 6582 6601 6604 6607 6618-6620 6623 6633 6636 6641 6646-6648 6686 6723 6764 6815 6822 6848 6923 6934 6962-6963 6984 6996 7054 7091 7148 7176 7192 7223 7233 7245 7261 7265 7269 7274 7282 7285 7296 7311 7315 7336 7343 7351 7354 7371 7389 7396 7426 7436 7445-7446 7448 7458 7472 7475 7478 7492 7518 7548 7569-7570 7576 7623 7640 7642 7644 7655 7699 7716 7745 7758 7764 7808 7857 7911 7937 7969 8008 8031 8057 8067 8071 8100 8199 8226 8305 8345 8365 8374 8487 8515 8556 8559 8577 8699 8729 8751 8762 8830 8858 8868 8912 8915 8943 8945 8955 8972 9003 9013 9049 9060 9073 9075 9103-9104 9136 9164-9165 9168 9170 9202 9220 9244-9245 9264 9301 9310-9311 9316 9327 9334 9353 9369 9372 9383 9402 9405-9406 9410 9440 9442 9444 9447 9452 9455 9460 9464 9467 9470 9472 9477 9497 9501 9512-9513 9515 9536 9586 9588 9594 9600 9612 9614-9615 9618 9629 9633 9636 9655 9676 9684 9688 9705 9707 9711 9714 9723 9737 9743 9762 9770 9773 9796 9805 9809 9811 9823 9860 9872 9876-9877 9879 9882 9892-9893 9906 9960-9961 9963 9976 9978 9985 9998-9999 10006 10020 10030 10046-10047 10071 10095 10105 10112 10119 10148 10152-10154 10163 10182-10183 10198 10207 10250 10258 10262 10280 10337 10352 10389 10401 10426 10440 10463 10466 10474 10491 10501 10512 10518-10519 10524 10526 10529 10548 10550-10551 10561 10570-10572 10592 10605 10612 10615 10625 10650 10656 10669 10673 10681 10688 10691 10695 10706 10715 10766 10780 10796 10798 10800-10801 10803 10810 10815 10829 10836 10843 10848 10852 10867 10877 10910 10921 10932 10938 10948-10949 10969 10977-10978 10986 10994 10996 10999 11012 11024 11027 11035 11045 11049 11087 11094 11100 11116 11118 11124 11126 11143 11150 11160 11191 11195 11212 11242 11260 11279 11290 11321 11323 11334 11352 11373-11374 11385 11388 11396 11402 11429-11430 11444 11449 11456 11460 11490 11514-11515 11521-11523 11529 11552 11585-11586 11589 11608 11631 11639-11640 11649 11669 11676 11682 11686 11736 11777-11778 11845 11876 11891 11912 11918 11936 11945 12179 12352 12547-12548 12580 12599 12604 12896 13098 13153 13156 13179 13320 13353 13380 13406 13410 13496 13504 13582 13585-13586 13614 13625 13640 13650 13664 13674 13705 13729 13731 13743 13820 13927 14068 14150 14173 14520 14751 14797 14831 14842 14854 14857 14899 14946 14955 15023 15037 15059 15082 15147 15207 15211 15269 15305-15306 15311 15344 15881 15916-15917 15935-15936 15955 16027 16049 16059 16083 16093 16113 16170 16272 16281 16298 16302 17775 17791 17820 17857 17902 17917 18005 18035 18037 18184 18205 18210 18253 18259 18275 18378 18388 18402 18868-18869 18881 18889 18898 18918 19034 19190 19200 19217 19223 19225 19237 19271 19281 19344 19436 19483 19566-19567 19618 19622 19629 19671 19723-19724 19756 19778 19789 19803 19895 19907 19989 19997 19999 20016 20020 20072 20099 20119 20141 20144 20146 20157 20195 20213 20264 20304 20325 20377 20395 20433 20456 20460 20468 21879 21960 21970 22364 22396 22950 22965 23014-23016 23022 23029 23127 23133-23134 23165 23211 23240 23261 23304 23311 23335 23354 23358 23427 23486 23691 23761 23835 23897 24112 24123 24260 25949 26012 26015 26027 26031 26035 26228 26322 26381 26394 26427 26443 26472 26518 26523 26550 26563 26571 26578 26592 26595 26614 27229 27243 27250 27310-27311 27321 27324 27394 27523 27631 27657 27711 27796-27797 27845 27851 27926 28101 28117 28138-28139 28167 28225 28248 28258 28290 28315 28342 28352 28401 28454 28463 28471 28476 28478-28479 28492 28495 28498 28502 28517 28521 28539 28542 28546 28561 28589 28629 28643 28647 28662 28664 30147 30171 30193 30195 30572-30573 31157 31176 31211 31229 31389 31407 31451 31472 31485 31520 31529 31535 31539 31547 31634 31663-31664 31666 31784 31894 31967 31986 31995 32230 32261 32264 32345 32497 32511 32517 32527 32605 32611 32660 32674 32687 32712 32738 327642.85864675833786e-19 3.5010283109654867e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/510/1791?format=asciiOpticalRadiodefaultJ/MNRAS/510/1791/table1*Basic parameters of our blazars samplezHeliocentric redshift (Redshift)src.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject ID number (Object_ID)meta.idintNameSource name based on J2000 position as JHHMMSS+DDMMSS (Name) (G1)meta.id;meta.maincharBZCAT5Display the BZCAT5 data (Massaro et al. 2015, Cat. VII/274)meta.ref.urlcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainClassSource classification (Type) (G2)src.classcharrmagThe Roma BZCAT r-band SDSS magnitude of the blazar taken from USNO-B1 catalogue (Rmag) (1)magphot.mag;em.opt.RfloatJ/MNRAS/510/1791/table3Retrieved parameters and the trends from ZTF DR6 light curves for our blazars samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject ID number (Object_ID)meta.idintNameSource name based on J2000 position as JHHMMSS+DDMMSS (Name) (G1)meta.id;meta.maincharClassSource classification (Type) (G2)src.classcharTrendColour trend on ZTF DR6 r-g versus r colour-magnitude diagrams (Trend) (1)src.class.colorcharDuration[partial whole] Trend duration of MJD time observations on colour variation diagrams (Duration) (2)src.classcharPsir? Amplitude of variability {Psi}_r_ computed ZTF DR6 SDSS r band magnitudes ({Psi}_r_) (3)magsrc.var.amplitudefloatnullableDFvar? Difference of fractional variability amplitudes in g and r bands as F_varg_ - F_varr_ ({Delta}F_var_) (4)src.var.amplitudedoublenullablee_DFvar? Computed error {sigma} of DFvar ({sigma}{Delta}F_var_) (4)stat.errordoublenullable