J/ApJ/854/66ivo://CDS.VizieR/J/ApJ/854/66doi:10.26093/cds/vizier.18540066CDSKapanadze B.Vercellone S.Romano P.Hughes P.Aller M.Aller H.,Kharshiladze O.Kapanadze S.Tabagari L.2025-11-03T20:13:31Z2019-01-02T07:56:24ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsx-ray-sourcesultraviolet-photometryWe present detailed results of Swift observations of the nearby TeV-detected blazar Mrk 421, based on the rich archival data obtained during 2005 March-2008 June. The best fits of the 0.3-10keV spectra were mainly obtained using the log-parabolic model, yielding low spectral curvatures expected in the case of the efficient stochastic acceleration of particles. During strong X-ray flares, the position of the synchrotron spectral energy distribution peak E_p_ was beyond 8keV for 41 spectra, while it sometimes was situated at the UV frequencies in quiescent states. The photon index at 1 keV exhibited a broad range, and the values a<1.70 were observed during the strong flares, hinting at the possible presence of a jet hadronic component. The spectral parameters were correlated in some periods, expected in the framework of the first- and second-order Fermi accelerations of X-ray emitting particles, as well as in the case of turbulence spectrum. The 0.3-10keV flux and spectral parameters sometimes showed very fast variability down to the fluctuations by 6-20% in 180-960s, possibly related to the small-scale turbulent areas containing strongest magnetic fields. X-ray and very high-energy fluxes often showed correlated variability, although several occurrences of more complicated variability patterns are also revealed, indicating that the multifrequency emission of Mrk 421 could not be generated in a single zone.2018ApJ...854...66Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/854/66CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/swift : Swift Master Catalog (HEASARC, 2004-)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)J/ApJS/233/17 : Swift/BAT AGN spectrosc. survey. V. X-ray data (Ricci+, 2017)J/ApJS/232/7 : 8yr R-band photopolarimetry of blazar Mrk 421 (Fraija+, 2017)J/ApJ/848/103 : ~1.5yr Swift observations of Mrk 421 (Kapanadze+, 2017)J/ApJ/831/102 : Swift and NuSTAR obs. of the BL Lac Mrk 421 (Kapanadze+, 2016)J/A+A/593/A91 : Mrk 421 multi-wavelength variability, 2007-2009 (Ahnen+, 2016)J/ApJS/222/6 : 4.5yr obs. of Mrk421 with ARGO-YBJ + Fermi (Bartoli+, 2016)J/ApJS/226/20 : X-ray, opt. + radio SEDs of Fermi blazars (Fan+, 2016)J/A+A/578/A22 : Mrk421 in March 2010 (Aleksic+, 2015)J/A+A/576/A126 : The 2009 multiwavelength campaign on Mrk421 (Aleksic+, 2015)J/A+A/563/A57 : Long-term variability of AGN at hard X-rays (Soldi+, 2014)J/other/RAA/14.1135 : Doppler factor for a Fermi blazar sample (Fan+, 2014)J/ApJS/209/14 : The Swift/BAT hard X-ray transient monitor (Krimm+, 2013)J/ApJS/207/16 : BL Lac candidates for TeV observations (Massaro+, 2013)J/A+A/559/A75 : 43GHz observation of the blazar Mrk 421 (Blasi+, 2013)J/A+A/545/A117 : Monitoring of Mrk 421 at 15 and 24 GHz (Lico+, 2012)J/A+A/541/A160 : Planck + X/{gamma} observations of blazars (Giommi+, 2012)J/ApJ/761/125 : X and {gamma} spectral indexes of Fermi blazars (Fan+, 2012)J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011)J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)J/MNRAS/407/2399 : AGN activity and black hole mass (McKernan+, 2010)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/ApJ/681/113 : Swift BAT survey of AGNs (Tueller+, 2008)J/A+A/476/759 : X-ray properties of AGN from the CJF sample (Britzen+, 2007)J/A+A/434/385 : X-ray/radio data of high energy peaked BL Lacs (Giommi+, 2005)J/A+A/401/927 : The HRX-BL Lac sample (Beckmann+, 2003)J/ApJ/525/127 : RGB sample of BL Lacertae objects (Laurent-Muehleisen+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/854/66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/854/66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/854/66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/854/66https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/854/66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/854/66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapX-rayUVdefaultJ/ApJ/854/66/table1Summary of the XRT and UVOT observations in 2005 March - 2008 JuneobsIDObservation identifiermeta.id;obs.param;obslongrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintstartUTC date of observation startstime.start;obsnullableendUTC date of observation endstime.end;obsnullableExp[319/33289] Exposure timestime.duration;obs.exposureintXRT[7.6/156] Observation-binned 0.3-10keV count ratect/sphot.count;em.X-rayfloate_XRT[0.04/0.6] Uncertainty in XRTct/sstat.errorfloatuvw1mag[11.4/12.8]? De-reddened Swift/UVOT uvw1 band magnitudemagphot.mag;em.UVfloatnullablee_uvw1mag[0.03/0.3]? Uncertainty in uvw1magmagstat.error;phot.magfloatnullableFuvw1[7/24]? De-reddened Swift/UVOT uvw1 band flux densitymJyphot.flux.density;em.UVfloatnullablee_Fuvw1[0.2/1]? Uncertainty in Fuvw1mJystat.errorfloatnullableuvm2mag[11.3/13]? De-reddened Swift/UVOT uvm2 band magnitudemagphot.mag;em.UVfloatnullablee_uvm2mag[0.03/0.06]? Uncertainty in uvm2magmagstat.error;phot.magfloatnullableFuvm2[4.8/22.1]? De-reddened Swift/UVOT uvm2 band flux densitymJyphot.flux.density;em.UVfloatnullablee_Fuvm2[0.1/0.6]? Uncertainty in Fuvm2mJystat.errorfloatnullableuvw2mag[11.2/12.7]? De-reddened Swift/UVOT uvw2 band magnitudemagphot.mag;em.UVfloatnullablee_uvw2mag[0.03/0.04]? Uncertainty in uvw2magmagstat.error;phot.magfloatnullableFuvw2[6.6/23.1]? De-reddened Swift/UVOT uvw2 band flux densitymJyphot.flux.density;em.UVfloatnullablee_Fuvw2[0.1/0.7]? Uncertainty in Fuvw2mJystat.errorfloatnullableJ/ApJ/854/66/table2Results of the spectral analysis with the log-parabolic modelobsIDObservation identifiermeta.id;obs.param;obslongOrbitOrbit numbermeta.idcharEp[0.02/22.4] Model parameter, position of the SED peakkeVem.energyfloate_K[0.01/0.2] Uncertainty in Kstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPartPart number and seconds [#s] of the orbit used in the fitmeta.idchara[1.6/2.7] Model parameter, photon index at the energy E1meta.code;stat.param;meta.modelledfloate_a[0.01/0.05] Uncertainty in astat.errorfloatb[0.07/0.5] Model parameter, curvature parameterstat.param;meta.modelledfloate_b[0.02/0.2] Uncertainty in bstat.errorfloate_Ep[0.01/2.1] Uncertainty in EpkeVstat.errorfloatK[0.8/9.3] Model parameter, normalization factorstat.paramfloatchi2[0.4/1.2] Reduced {chi}^2^ parameterstat.paramfloatDOF[54/337] Fit degrees of freedomstat.fit.dofintlogFS[-9.6/-8] Log unabsorbed 0.3-2keV Fluxlog(mW.m**-2)phot.flux;em.X-rayfloate_logFS[0.01/0.02] Uncertainty in logFSlog(mW.m**-2)stat.errorfloatlogFH[-10.2/-8.5] Log unabsorbed 2-10keV Fluxlog(mW.m**-2)phot.flux;em.X-rayfloate_logFH[0.01/0.04] Uncertainty in logFHlog(mW.m**-2)stat.errorfloatlogFT[-9.5/-8.2] Log unabsorbed 0.3-10keV Fluxlog(mW.m**-2)phot.flux;em.X-rayfloate_logFT[0.01/0.02] Uncertainty in logFHlog(mW.m**-2)stat.errorfloatHR[0.2/1.4] Hardness ratio (G1)phot.flux;arith.ratiofloate_HR[0.01/0.05] Uncertainty in HRstat.errorfloatJ/ApJ/854/66/table5Results of the spectral analysis with the power-law modelobsIDObservation identifiermeta.id;obs.param;obslongrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOrbitOrbit numbermeta.idcharPartPart number and seconds [#s] of the orbit used in the fitmeta.idcharGamma[1.6/2.8] Photon index in PL modelmeta.code;spect.index;meta.modelledfloate_Gamma[0.01/0.05] Uncertainty in Gammastat.errorfloatK[0.3/8.8] Normalizationstat.paramfloate_K[0.01/0.1] Uncertainty in Kstat.errorfloatchi2[0.8/1.2] Reduced {chi}^2^ parameterstat.paramfloatDOF[58/3226] Fit degrees of freedomstat.fit.dofintlogFS[-9.9/-8.6] Log unabsorbed 0.3-2keV Fluxlog(mW.m**-2)phot.flux;em.X-rayfloate_logFS[0.01] Uncertainty in logFSlog(mW.m**-2)stat.errorfloatlogFH[-10.5/-8.5] Log unabsorbed 2-10keV Fluxlog(mW.m**-2)phot.flux;em.X-rayfloate_logFH[0.01/0.03] Uncertainty in logFHlog(mW.m**-2)stat.errorfloatlogFT[-9.8/-8.2] Log unabsorbed 0.3-10keV Fluxlog(mW.m**-2)phot.flux;em.X-rayfloate_logFT[0.01] Uncertainty in logFHlog(mW.m**-2)stat.errorfloatHR[0.2/1.5] Hardness ratio (G1)phot.flux;arith.ratiofloate_HR[0.01/0.04] Uncertainty in HRstat.errorfloatJ/ApJ/854/66/table7Summary of the 0.3-10keV intra-day variabilities (IDVs) in 2005 March - 2008 JunerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintobsIDObservation identifier (1)meta.id;obs.param;obscharDateUTC start date of observation (2)time.start;obsnullableDayEnd? End UTC Day of observation range (2)dtime.epochintnullableExp[0.07/24]? Total length of the particular observation (2)htime.expofloatnullablechi2[2.4/382] Reduced {chi}^2 parameterstat.paramfloatDOF[3/166] Fit degrees of freedomstat.fit.dofintBinBin of Orbit segment (2)spect.binSize;em.bincharFvar[1.3/32.2] Fractional variability amplitude%phot.mag;arith.ratiofloate_Fvar[0.1/3] Uncertainty in Fvar%stat.errorfloatParam1-Min[1.6/2.6]? LP/PL model param1 minimum (3)stat.paramfloatnullablee_Param1-Min[0.01/0.3]? Uncertainty in e_Param1-Min (3)stat.errorfloatnullableParam1-Max[1.7/2.7]? LP/PL model param1 maximum (3)stat.paramfloatnullablee_Param1-Max[0.01/0.1]? Uncertainty in e_Param1-Max (3)stat.errorfloatnullableParam1Param1 designation (3)meta.notecharParam2-Min[1.6/2.6]? LP/PL model param2 minimum (3)stat.paramfloatnullablee_Param2-Min[0.01/0.04]? Uncertainty in e_Param2-Min (3)stat.errorfloatnullableParam2-Max[1.8/2.6]? LP/PL model param2 maximum (3)stat.paramfloatnullablee_Param2-Max[0.01/0.02]? Uncertainty in e_Param2-Max (3)stat.errorfloatnullableParam2Param2 Range maximum (3)meta.notecharb-min[0.07/0.4]? Min curvature parameter in LP modelstat.param;meta.modelled;stat.minfloatnullablee_b-min[0.02/0.1]? Uncertainty in b-minstat.errorfloatnullableb-max[0.1/0.5]? Max curvature parameter in LP modelstat.param;meta.modelled;stat.maxfloatnullablee_b-max[0.03/0.1]? Uncertainty in b-maxstat.errorfloatnullableEp-min[0.02/7.5]? Min position of the SED peak in LP modelkeVem.energyfloatnullablee_Ep-min[0.01/0.5]? Uncertainty in Ep-minkeVstat.errorfloatnullableEp-max[0.03/23]? Max position of the SED peak in LP modelkeVem.energyfloatnullablee_Ep-max[0.01/18]? Uncertainty in Ep-maxkeVstat.errorfloatnullableHR-min[0.2/1.4]? Minimum hardness ratiophot.flux;stat.minfloatnullablee_HR-min[0/0.04]? Uncertainty in HR-minstat.errorfloatnullableHR-max[0.2/1.7]? Maximum hardness ratiophot.flux;stat.maxfloatnullablee_HR-max[0.01/0.04]? Uncertainty in HR-maxstat.errorfloatnullable