J/ApJ/958/127ivo://CDS.VizieR/J/ApJ/958/127CDSKhatu V.C.Gallagher S.C.Horne K.Cackett E.M.Hu C.Pasquini S.,Hall P.Wang J.-M.Bian W.-H.Li Y.-R.Bai J.-M.Chen Y.-J.Du Pu,Goad M.Jiang B.-W.Li S.-S.Songsheng Y.-Y.Wang C.Xiao M.Yu Z.2026-05-12T12:33:38Z2026-05-12T12:28:33ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomyspectroscopyWe performed a rigorous reverberation-mapping analysis of the broad-line region (BLR) in a highly accreting (L/L_Edd_=0.74-3.4) active galactic nucleus, Markarian 142 (Mrk 142), for the first time using concurrent observations of the inner accretion disk and the BLR to determine a time lag for the H{beta}{lambda}4861 emission relative to the ultraviolet (UV) continuum variations. We used continuum data taken with the Niel Gehrels Swift Observatory in the UVW2 band, and the Las Cumbres Observatory, Dan Zowada Memorial Observatory, and Liverpool Telescope in the g band, as part of the broader Mrk 142 multiwavelength monitoring campaign in 2019. We obtained new spectroscopic observations covering the H{beta} broad emission line in the optical from the Gemini North Telescope and the Lijiang 2.4m Telescope for a total of 102 epochs (over a period of 8 months) contemporaneous to the continuum data. Our primary result states a UV-to-H{beta} time lag of 8.68_-0.72_^+0.75^ days in Mrk 142 obtained from light-curve analysis with a Python-based running optimal average algorithm. We placed our new measurements for Mrk 142 on the optical and UV radius-luminosity relations for NGC 5548 to understand the nature of the continuum driver. The positions of Mrk 142 on the scaling relations suggest that UV is closer to the "true" driving continuum than the optical. Furthermore, we obtain log(M_{bullet}_/M_{sun}_)=6.32+/-0.29 assuming UV as the primary driving continuum.2023ApJ...958..127Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/958/127CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/115/185 : 3C 390.3 BVRI and H photometry (Dietrich+, 1998)J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)J/ApJ/795/38 : Phot./spectroscopic measurements for KA1858+4850 (Pei+, 2014)J/ApJ/795/149 : Reverberation mapping of the Sy1 NGC 7469 (Peterson+, 2014)J/ApJ/793/108 : SEAMBHs. II. Continuum and Hbeta LCs (Wang+, 2014)J/ApJ/806/22 : SEAMBHs IV. H{beta} time lags (Du+, 2015)J/ApJ/825/126 : SEAMBHs. V. The third year (Du+, 2016)J/ApJ/827/118 : A new reverberation mapping campaign on NGC 5548 (Lu+, 2016)J/ApJ/837/131 : Space telescope RM project. V. NGC5548 sp. (Pei+, 2017)J/ApJ/866/133 : Continuum-H{beta} light curves of 5 Seyfert 1 (De Rosa+, 2018)J/ApJ/856/6 : SEAMBHs IX. 10 new H{beta} light curves (Du+, 2018)J/ApJ/870/123 : Swift optical & UV flux of four AGNs (Edelson+, 2019)J/ApJ/876/49 : A 10yr reverberation mapping campaign for 3C273 (Zhang+, 2019)J/ApJ/896/1 : SEAMBHs. XI. Mrk 142 X-ray to optical LCs (Cackett+, 2020)J/ApJ/901/133 : Supermassive BH masses of AGNs (Yu+, 2020)J/ApJ/920/9 : YFOSC light curves of PG 0923+201 and PG 1001+291 (Li+, 2021)J/ApJS/263/10 : 2015, 2018-2021 sp. monitoring of NGC 5548 (Lu+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/958/127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/958/127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/958/127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/958/127https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/958/127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/958/127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/958/127/table1*Summary of Mrk 142 GMOS observations from 2019 February to JunerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[1/33] Epoch numberyrmeta.idintDateDate of observation (UT)time.epochnullableMJDModified Julian Date at the start of the observations, 0.75" slitdtime.epochdoublef_MJDFlag on MJD (1)meta.codecharMJD5Modified Julian Date at the start of the observations, 5.00" slitdtime.epochdoublef_MJD5Flag on MJD5 (1)meta.codecharAirmass[1.175/1.7] Airmass, 0.75" slitobs.airMassfloatAirmass5[1.176/1.75] Airmass, 5.00" slitobs.airMassfloatFluxDisplay the OIII, Hb and HeI measurements for this Epoch (Tables 4-6)meta.ref.urlcharspInteractive spectrum plotmeta.ref.urlcharJ/ApJ/958/127/table4[OIII]{lambda}5008 emission-line measurements for Gemini spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[1/33] Gemini Spectrum Epochmeta.idintlambda[5008.11/5008.34] Position of [OIII]5008A, Angstroms0.1nmem.wlfloate_lambda[0.03/0.07] Uncertainty in lambda0.1nmstat.error;em.wlfloatFWHM[292/338] FWHM, [OIII]5008{AA}km/sspect.line.widthinte_FWHM[2/10] Uncertainty in FWHMkm/sstat.error;spect.line.widthintFlux[15.3/16.4] Flux, [OIII]5008{AA}, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.line.OIIIfloate_Flux[0.2/0.5] Uncertainty in Flux1e-18W.m**-2stat.error;phot.flux;em.line.OIIIfloatchi2v[0.97/1.35] Reduced {chi}^2/dof model statisticstat.fit.chi2floatJ/ApJ/958/127/table5H{beta}{lambda}4861 emission-line measurements for Gemini spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[1/33] Gemini Spectrum Epochmeta.idintFWHM-b[1499/1830] FWHM, H{beta}4861{AA}, broad componentkm/sspect.line.widthinte_FWHM-b[43/132] Uncertainty in FWHM-bkm/sstat.error;spect.line.widthintFlux-b[94.9/140.4] Flux, H{beta}4861{AA}, broad component, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.line.Hbetafloate_Flux-b[2.1/5.8] Uncertainty in flux-b1e-18W.m**-2stat.error;phot.flux;em.line.HbetafloatFWHM-n[291/337] FWHM, H{beta}4861{AA}, narrow componentkm/sspect.line.widthinte_FWHM-n[1/10] Uncertainty in FWHM-nkm/sstat.error;spect.line.widthintFlux-n[3.1/6.1] Flux, H{beta}4861{AA}, narrow component, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.line.Hbetafloate_Flux-n[0.4/0.8] Uncertainty in flux-n1e-18W.m**-2stat.error;phot.flux;em.line.HbetafloatFWHM-t[1235/1603] FWHM, H{beta}4861A, totalkm/sspect.line.widthinte_FWHM-t[30/165] Uncertainty in FWHM-tkm/sstat.error;spect.line.widthintFlux-t[99.2/146.3] Flux, H{beta}4861{AA}, total, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.line.Hbetafloate_Flux-t[2.1/5.8] Uncertainty in Flux-t1e-18W.m**-2stat.error;phot.flux;em.line.Hbetafloatf_EpochEpoch rejection flags (G1)meta.codecharJ/ApJ/958/127/table6HeI{lambda}5877 emission-line measurements for Gemini spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[1/33] Gemini Spectrum Epochmeta.idintFWHM-b[34/1870] FWHM, HeI5877{AA}, broad componentkm/sspect.line.widthinte_FWHM-b[25/654] Uncertainty in FWHM-bkm/sstat.error;spect.line.widthintFlux-b[31.4/55.6] Flux, HeI5877{AA}, broad component, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.linefloate_Flux-b[0.7/1.4] Uncertainty in Flux-b1e-18W.m**-2stat.error;phot.flux;em.linefloatFWHM-n[291/337] FWHM, HeI5877{AA}, narrow componentkm/sspect.line.widthinte_FWHM-n[1/10] Uncertainty in FWHM-nkm/sstat.error;spect.line.widthintFlux-n[0.0/0.9] Flux, HeI5877{AA}, narrow component, 10-15 erg/s/cm21e-18W.m**-2phot.flux;em.linefloate_Flux-n[0.1/0.2] Uncertainty in Flux-n1e-18W.m**-2stat.error;phot.flux;em.linefloatFWHM-t[34/1962] FWHM, HeI5877A, totalkm/sspect.line.widthinte_FWHM-t[20/682] Uncertainty in FWHM-tkm/sstat.error;spect.line.widthintFlux-t[32.0/55.7] Flux, HeI5877{AA}, total, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.linefloate_Flux-t[0.7/1.4] Uncertainty in Flux-t1e-18W.m**-2stat.error;phot.flux;em.linefloatf_EpochEpoch rejection flags (G1)meta.codecharJ/ApJ/958/127/table7[OIII]{lambda}5008 emission-line measurements for LJT spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[1/69] LJT Spectrum Epochmeta.idintf_EpochEpoch rejection flags (G2)meta.codecharlambda[5007.16/5008.33] Position of [OIII]5008{AA}, Angstroms0.1nmem.wlfloate_lambda[0.06/0.24] Uncertainty in lambda0.1nmstat.error;em.wlfloatFWHM[634/880] FWHM, [OIII]5008{AA}km/sspect.line.widthinte_FWHM[0/49]? Uncertainty in FWHMkm/sstat.error;spect.line.widthintnullableFlux[14.5/19.6] Flux, [OIII]5008{AA}, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.line.OIIIfloate_Flux[0.2/1.0] Uncertainty in Flux1e-18W.m**-2stat.error;phot.flux;em.line.OIIIfloatchi2v[1.05/4.65] Reduced {chi}^2/dof model statisticstat.fit.chi2floatJ/ApJ/958/127/table8H{beta}{lambda}4861 emission-line measurements for LJT spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[1/69] LJT Spectrum Epochmeta.idintFWHM-b[1802/2129] FWHM, H{beta}4861{AA}, broad componentkm/sspect.line.widthinte_FWHM-b[29/133] Uncertainty in FWHM-bkm/sstat.error;spect.line.widthintFlux-b[75.4/98.8] Flux, H{beta}4861{AA}, broad component, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.line.Hbetafloate_Flux-b[0.7/21.5] Uncertainty in Flux-b1e-18W.m**-2stat.error;phot.flux;em.line.HbetafloatFWHM-n[634/880] FWHM, H{beta}4861{AA}, narrow componentkm/sspect.line.widthinte_FWHM-n[0/49]? Uncertainty in FWHM-nkm/sstat.error;spect.line.widthintnullableFlux-n[4.2/5.7] Flux, H{beta}4861{AA}, narrow component, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.line.Hbetafloate_Flux-n[0.0/0.3] Uncertainty in Flux-n1e-18W.m**-2stat.error;phot.flux;em.line.HbetafloatFWHM-t[1536/1848] FWHM, H{beta}4861{AA}, totalkm/sspect.line.widthinte_FWHM-t[29/127] Uncertainty in FWHM-tkm/sstat.error;spect.line.widthintFlux-t[80.6/103.0] Flux, H{beta}4861{AA}, total, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.line.Hbetafloate_Flux-t[0.7/21.5] Uncertainty in Flux-t1e-18W.m**-2stat.error;phot.flux;em.line.Hbetafloatf_EpochEpoch rejection flags (G2)meta.codecharJ/ApJ/958/127/table9HeI{lambda}5877 emission-line measurements for LJT spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[1/69] LJT Spectrum Epochmeta.idintFWHM-b[1713/5320] FWHM, HeI5877{AA}, broad componentkm/sspect.line.widthinte_FWHM-b[224/1067] Uncertainty in FWHM-bkm/sstat.error;spect.line.widthintFlux-b[45.0/61.1] Flux, HeI5877{AA}, broad component, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.linefloate_Flux-b[0.9/4.1] Uncertainty in Flux-b1e-18W.m**-2stat.error;phot.flux;em.linefloatFWHM-n[634/880] FWHM, HeI5877{AA}, narrow componentkm/sspect.line.widthinte_FWHM-n[0/49]? Uncertainty in FWHM-nkm/sstat.error;spect.line.widthintnullableFlux-n[0.49/0.67] Flux, HeI5877{AA}, narrow component, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.linefloate_Flux-n[0.01/0.03] Uncertainty in Flux-n1e-18W.m**-2stat.error;phot.flux;em.linefloatFWHM-t[1708/4224] FWHM, HeI5877{AA}, totalkm/sspect.line.widthinte_FWHM-t[203/876] Uncertainty in FWHM-tkm/sstat.error;spect.line.widthintFlux-t[45.6/61.7] Flux, HeI5877{AA}, total, 10-15erg/s/cm21e-18W.m**-2phot.flux;em.linefloate_Flux-t[0.9/4.1] Uncertainty in Flux-t1e-18W.m**-2stat.error;phot.flux;em.linefloatf_EpochEpoch rejection flags (G2)meta.codechar