J/ApJS/278/11ivo://CDS.VizieR/J/ApJS/278/11CDSLiang S.Yang W.G.Zheng Y.G.Kang S.J.2026-03-09T08:36:29Z2026-03-09T09:27:10ZCDS support team

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

cds-question@unistra.frquasarsbl-lacertae-objectsgamma-ray-astronomyspectral-energy-distributionredshiftedA sample of 312 low-frequency-peaked BL Lacertae objects (LBLs) and 694 flat-spectrum radio quasars (FSRQs) with the parameters of both redshift and gamma-ray photon spectral index ({Gamma}_{gamma}_) is compiled from the Fourth Catalog of Active Galactic Nuclei Data Release 2 from the Fermi Large Area Telescope (LAT). The multiwavelength data of the sample sources are downloaded from the Space Science Data Center, and then matched to the corresponding gamma-ray data from the Fermi-LAT Fourth Source Catalog DR2. The synchrotron radiation peak frequency and Compton dominance (CD) parameters of the sources are obtained by using a log-parabolic model to fit the average-state multiwavelength spectral energy distribution. A support vector machine in the logL_{gamma}_-{Gamma}_{gamma}_ frame is utilized to delineate the optimal boundary between FSRQs and LBL sources. The 1{sigma} position of the Gaussian fitting on the histograms of the {Gamma}_{gamma}_, log{nu}_peak_^syn^, and CD parameter distributions are also introduced. With this criterion, 25 FSRQ candidates are selected from LBL sample sources. The optical spectral identification result confirms that 8 out of 13 candidate sources available with the optical spectral data exhibit the relationship of EW>5{AA}.2025ApJS..278...11Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/278/11CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+ 2006)IX/67 : Fermi LAT 4th source cat. (4FGL-DR3) (Fermi-LAT col., 2022)J/AJ/87/859 : Polarisation of radio sources at 6 and 20cm (Perley, 1982)J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)J/ApJS/143/1 : FIRST-APM Source Catalog (McMahon+, 2002)J/ApJ/590/109 : Gamma-ray blazar in northern sky (Sowards-Emmerd+, 2003)J/ApJS/171/61 : All-Sky Survey of Flat-Spectrum Radio Sources (Healey+, 2007)J/AJ/135/2453 : Sample of BL Lac objects from SDSS and FIRST (Plotkin+, 2008)J/MNRAS/396/223 : QSO candidates selection in VO era (D'Abrusco+, 2009)J/ApJS/180/67 : Phot. selection of quasars from SDSS. II. (Richards+, 2009)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/ApJ/757/25 : Fermi/LAT AGN at 5GHz (Linford+, 2012)J/ApJ/757/25 : Fermi/LAT AGN at 5GHz (Linford+, 2012)J/ApJ/764/135 : Spectroscopic redshifts of BL Lac objects (Shaw+, 2013)J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)J/other/RAA/18.56 : gamma-ray spectrum for Fermi blazars (Kang+, 2018)J/ApJS/241/34 : SDSS Reverberation Mapping (SDSS-RM) project (Shen+, 2019)J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)J/ApJ/892/105 : 4th catalog of Fermi LAT-detected AGNs (4LAC) (Ajello+, 2020)J/ApJS/247/49 : gri obs. of the blazar S5 0716+714 (2017-2019) (Xiong+, 2020)J/ApJS/253/46 : Optical spectroscopy of Fermi blazars (Paliya+, 2021)J/ApJS/261/32 : Finding GPQs. II. Sp. obs. of |b|<20{deg} QSOs (Fu+, 2022)J/ApJS/262/18 : Spectral energy distributions for 4FGL blazars (Yang+, 2022)J/ApJS/263/24 : The 4LAC-DR3 catalog (Ajello+, 2022)J/ApJS/265/25 : LAMOST Quasar Survey DR6-DR9 (Jin+, 2023)http://fermi.gsfc.nasa.gov/ssc/data/access/lat/4LACDR3/ : 4LAC Fermi productshttp://www.ssdc.asi.it/ : Space Science Data Center (SSDC) homepagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/278/11https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/278/11http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/278/11https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/278/11https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/278/11http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/278/11GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/278/11/sample (Logarithmic parabola fitting results for BL Lacertae objects (LBLs; Table 1) and flat-spectrum radio quasars (FSRQs; Table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/278/11/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/278/11/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/278/11/sample?GETtext/xml+votable180.050000true0.3251039-7.77414440.0055555555555555566/39 60 100 110 172 180 342 376 438 532 579 597 611 700 770 808 911 968 988 991 1018 1085 1154 1509 1546 1584 1593 1622 1767 1782 2100 2122 2140 2143 2228 2234 2310 2331 2400 2404 2460 2574 2605 2616 2636 2661 2708 2741 2792 2822 2836 2867 3017 3024 3096 3128 3366 3402 3492 3675 3712 3820 3876 3882 3886 3951 4260 4352 4407 4435 4550 4572 4601 4685 4695 4746 4750 4770 4820 4825 4855 4880 4940 4977 5009 5098 5125 5139 5154 5156 5162 5191 5201 5212 5250 5268 5284 5306 5352-5353 5371 5390 5404-5405 5448 5450 5455 5458 5460 5491 5521 5523 5546 5589 5597 5616 5673 5693 5728 5771 5775-5776 5792 5795 5803 5817 5836 5838 5848 5870 5878 5891 5986 5999 6062 6101 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48841 48846 48878 48885 48974 48995 49037 49071 49083https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/278/11?format=asciiGamma-raydefaultJ/ApJS/278/11/sampleLogarithmic parabola fitting results for BL Lacertae objects (LBLs; Table 1) and flat-spectrum radio quasars (FSRQs; Table 2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOTBL Lacertae objects (LBLs; Table 1) or flat-spectrum radio quasars (FSRQs; Table 2)src.classchar4FGL4FGL name of sources (JHHMM.m+DDd)meta.id;meta.maincharAssocAssociated source namemeta.idcharz[-0.003/4.4]? Redshift (1)src.redshiftfloatnullableGamma[1.2/3.3] Gamma-ray photon spectral index, {Gamma}_{gamma}_spect.indexfloatlognupksLP[8.7/26]? Log, Synchrotron radiation peak frequency; log{nu}_peak_^syn^log(Hz)em.freqfloatnullablelognupkicLP[8/201.7]? Log, Inverse Compton scattering peak frequency; log{nu}_peak_^ic^log(Hz)em.freqfloatnullablelognufpksynLP[-14/-5.9]? Log, Synchrotron radiation peak flow; log{nu}f{nu}_peak_^syn^log(mW.m**-2)phot.flux.density;em.gamma.hardfloatnullablelognufpkicLP[-20.2/242.5]? Log, Inverse Compton scattering peak flow; log{nu}f{nu}_peak_^ic^log(mW.m**-2)phot.flux.density;em.gamma.hardfloatnullableCD[0/649.6]? Compton dominant parameterstat.fit.paramfloatnullablelogLgamma[36.6/50.9]? Log, gamma-ray luminositylog(1e-07W)phys.luminosity;em.gammafloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main