J/ApJS/226/17ivo://CDS.VizieR/J/ApJS/226/17doi:10.26093/cds/vizier.22260017CDSLiao N.-H.Xin Y.-L.Fan X.-L.Weng S.-S.Li S.-K.Chen L.Fan Y.-Z.2017-06-13T11:09:24Z2016-12-06T09:22:45ZCDS support team

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

cds-question@unistra.frquasarsinfrared-photometryvisible-astronomybroad-band-photometryultraviolet-astronomyx-ray-sourcesIII Zw 2 is the prototype of radio-intermediate quasars. Although there is the evidence of possessing strong jet, significant {gamma}-ray emission has not been reported before. In this work, we carry out a detailed analysis of the latest Fermi-LAT Pass 8 data. No significant {gamma}-ray signal has been detected in the time-averaged 7-year Fermi-LAT data of III Zw 2; however, we have identified two distinct {gamma}-ray flares with isotropic luminosities of ~10^45^erg/s. Multiwavelength data analysis (also including the optical photometric observations from Yunnan Observatories) are presented and the main finding is simultaneous optical and {gamma}-ray flares of III Zw 2 appearing in 2009 November. Violent {gamma}-ray variability with a doubling timescale of 2.5hr was detected in another {gamma}-ray flare in May 2010, for which the 3-hr {gamma}-ray peak flux is ~250 times of the average flux in 7 years. Rather similar behaviors are observed in blazars and the blazar model can reasonably reproduce the spectral energy distribution of III Zw 2 in a wide energy range, strongly suggesting that its central engine resembles that of blazars. In view of its core, which shares radio similarities with young radio sources, together with weak extended radio lobe emission, we suggest that III Zw 2 harbors a recurrent activity core and thus serves as a valuable target for investigating the fueling and triggering of the activity in radio-loud active galactic nuclei.2016ApJS..226...17Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/226/17CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/587/A112 : Long term R and V band monitoring of AGN (Taris+, 2016)J/ApJ/810/L9 : 1.5Jy MOJAVE AGN sample and 3FGL data (Lister+, 2015)J/ApJ/810/14 : Third catalog of LAT-detected AGNs (3LAC) (Ackermann+, 2015)J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)J/MNRAS/441/1899 : Fermi bright blazars (Fuhrmann+, 2014)J/MNRAS/439/690 : Optical/{gamma}-ray variability in blazars (Hovatta+, 2014)J/other/Sci/338.1445 : Relativistic jets from BH systems (Nemmen+, 2012)J/A+A/541/A160 : Planck + X/{gamma} observations of blazars (Giommi+, 2012)J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)J/ApJ/753/104 : AGN identifications from AKARI and Swift (Matsuta+, 2012)J/ApJ/744/84 : Combined sample of radio-loud AGNs at 408MHz (Yuan+, 2012)J/ApJ/742/66 : New Fermi/LAT extragalactic sources (Teng+, 2011)J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011)J/ApJ/711/284 : Galaxy Zoo: AGN host galaxies (Schawinski+, 2010)J/ApJ/710/764 : Extended radio emission in MOJAVE blazars (Kharb+, 2010)J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)J/A+A/495/691 : Multifrequency cat. of blazars, Roma-BZCAT (Massaro+, 2009)J/AJ/138/1874 : MOJAVE. VI. Kinematic analysis of blazar jets (Lister+, 2009)J/ApJ/701/587 : Deep HST H-band survey. II. QUEST QSOs (Veilleux+, 2009)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/ApJS/171/376 : MOJAVE. III. VLA 1.4GHz images (Cooper+, 2007)J/ApJ/658/815 : Radio loudness of active galactic nuclei (Sikora+, 2007)J/ApJ/645/856 : Beamed radio-intermediate quasars (Wang+, 2006)J/AJ/131/1262 : Circ. polarization images at 15GHz of AGN jets (Homan+, 2006)J/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005)J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004)J/ApJ/590/73 : RASS AGN sample. II. (Xu+, 2003)J/ApJS/145/199 : Opt. spectroscopic atlas of low-redshift AGN (Marziani+, 2003)J/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)J/A+AS/136/455 : BVRI photometry of 3 BL Lac objects (Bai+, 1999)J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)J/ApJ/269/352 : Quasar evolution (Schmidt+, 1983)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/226/17https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/226/17http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/226/17https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/226/17https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/226/17http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/226/17GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticalUVX-raydefaultJ/ApJS/226/17/table1Swift resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsIDSwift observation IDmeta.id;obsDateUT date of the observationtime.epoch;obschargamma[1.4/2] X-ray photon index {Gamma}_X_spect.indexfloate_gammaNegative uncertainty on gammastat.errorfloatE_gammaPositive uncertainty on gammastat.error;stat.maxfloatFx[0.7/1.8] Unabsorbed 0.5-10keV X-ray fluxes; in units of 10-11erg/cm^2^/s (1)1e-14W.m**-2phot.flux;em.X-rayfloate_FxNegative uncertainty on Fx1e-14W.m**-2stat.errorfloatE_FxPositive uncertainty on Fx1e-14W.m**-2stat.error;stat.maxfloatFv[2/3.7]? Swift/UVOT V-band flux; absorption corrected (2)mJyphot.flux.density;em.opt.Vfloatnullablee_Fv? Fv uncertaintymJystat.errorfloatnullableFUW1[0.7/2.1]? Swift/UVOT UVW1 flux; absorption corrected (2)mJyphot.flux;em.UVfloatnullablee_FUW1? FUW1 uncertaintymJystat.errorfloatnullableFUM2[0.5/1.7]? Swift/UVOT UVM2 flux; absorption corrected (2)mJyphot.flux;em.UVfloatnullablee_FUM2? FUM2 uncertaintymJystat.errorfloatnullableFUW2[0.5/1.7]? Swift/UVOT UVW2 flux; absorption corrected (2)mJyphot.flux;em.UVfloatnullablee_FUW2? FUW2 uncertaintymJystat.errorfloatnullableJ/ApJS/226/17/table2The multi-bands photometric data from Yunnan ObservatoriesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDObservation date; JD-2400000.5dtime.epochdoublemag[14.1/16.8] Nightly average magnitude (1)magphot.magfloate_mag[0.01/0.09] Uncertainty in magmagstat.error;phot.magfloatBandPhotometric band (B, R or I)instr.bandpasschar