J/A+A/635/A75ivo://CDS.VizieR/J/A+A/635/A75doi:10.26093/cds/vizier.36350075CDSBilous A.V.Bondonneau L.Kondratiev V.I.Griessmeier J.-M.Theureau G.,Hessels J.W.T.Kramer M.van Leeuwen J.Sobey C.Stappers B.W.,ter Veen S.Weltevrede P.2020-08-20T08:18:11Z2020-03-10T10:34:45ZCDS support team

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

cds-question@unistra.frpulsarsinterstellar-mediumWe present the results from the low-frequency (40-78MHz) extension of the first pulsar census of non-recycled pulsars carried out with the LOw-Frequency ARray (LOFAR). We used the low-band antennas of the LOFAR core stations to observe 87 pulsars out of 158 that had been previously detected using high-band antennas. We present flux densities and flux-calibrated profiles for the 43 pulsars we detected. Of this sample, 17 have not, to our knowledge, previously been detected at such low frequencies. Here we recalculate the spectral indices using the new low-frequency flux density measurements from the LOFAR census and discuss the prospects of studying pulsars at very low frequencies using current and upcoming facilities, such as the New Extension in Nancay Upgrading LOFAR (NenuFAR).2020A&A...635A..75Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/635/A75CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/psr : ATNF Pulsar Catalogue (Manchester+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/635/A75https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/635/A75http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/635/A75https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/635/A75https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/635/A75http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/635/A75GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/635/A75/obssum (Observation summary, flux densities, dispersion measures)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/635/A75/obssum?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/635/A75/obssum?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/635/A75/obssum?GETtext/xml+votable180.050000true3.573958347.77594440.0055555555555555566/426 1257 1676 1949 2439 2573 2787 2858 2874 2943 3150 3552 3616 3784 3872 4352 4403 4556 4598 4831 5955 6262 7391 7821 8068 8121 8131 8277 8539 8644 8964 9040 9240 9282-9283 9719 11371 12259 12500 12526 12747 12870 12912 12993 13053 13065 13218 13405 13719 13759 13921 14122 14273 14346 14503 14549 14842 14924 15009 15304 15496 15646 15679 18421 20096 20166 23830 24040 24185 24428 24541 26520 28106 28135 28226 30657 31591 31717 31829 31933 32048 32058 32452 32546 32548 32647 32704https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/635/A75?format=asciiRadiodefaultJ/A+A/635/A75/obssumObservation summary, flux densities, dispersion measuresrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFitindicates fitted parameters in table[123]plmeta.ref.urlcharNameName of pulsar as in ATNF catalogue v.1.51meta.id;meta.maincharprimaryPeriodSpin period as in ATNF catalogue v.1.51smeta.idfloatObsEpochObserving epoch (MJD)dtime.epochdoubleObsLengthLength of observing sessionmintime.expointMinFreqLower edge of analysed frequency rangeMHzem.freqfloatMaxFreqUpper edge of analysed frequency rangeMHzem.freqfloatBestBeam? Beam with the most clear pulsar signalmeta.idintnullableMinZapFraction of zapped data for the least affected beam (1)stat.fit.paramfloatMaxZapFraction of zapped data for the most affected beamstat.fit.paramfloatPeakSN? Peak S/N ratio of the average profilestat.snrintnullableDM? Dispersion measure at the epoch of observationpc.cm**-3phys.dispMeasure;instr.dispersiondoublenullablee_DM? Dispersion measure uncertainty at the epoch of observationpc.cm**-3stat.errordoublenullableTscatFracExpected scattering time at 60 MHz divided by pulsar period (1)phot.flux.density;em.radio.20-100MHzfloatModIndExpected flux modulation index due to scintillation in the interstellar medium (2)src.var.indexfloatl_S[<=] Upper limit flag for flux density measurementmeta.code.errorcharSMean flux density in MinFreq-MaxFreq frequency range or upper limit for non-detected pulsarsphot.flux.density;em.radiofloate_S? Uncertainty in mean flux densitystat.errorintnullabler_S? Literature flux references, in refs.dat filemeta.ref;pos.framecharSimbadSimbad 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.mainJ/A+A/635/A75/refsReferencesComCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharJ/A+A/635/A75/table1plFitted parameters for the pulsars with spectra modeled with a single power-lawrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of pulsar as in ATNF catalogue v.1.51 (1)meta.id;meta.maincharFreqRngLoLower edge of the spectral frequency spanMHzem.freqintFreqRngHiUpper edge of the spectral frequency spanMHzem.freqintNNumber of data points in spectrummeta.numberintf0Reference frequencyMHzem.freqintS0Fitted mean flux density at the reference frequencymJyphot.flux.density;em.radiofloataFitted spectral indexspect.index;meta.modelledfloate_aUncertainty in fitted spectral indexstat.errorfloatsigunlgS? Fitted extra scatter of lg(S)stat.error;meta.modelledfloatnullableJ/A+A/635/A75/table2plFitted parameters for the pulsars with spectra modeled with a broken power-lawrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of pulsar as in ATNF catalogue v. 1.51meta.id;meta.maincharFreqRngLoLower edge of the spectral frequency spanMHzem.freqintFreqRngHiUpper edge of the spectral frequency spanMHzem.freqintNNumber of data points in spectrummeta.numberintf0Reference frequencyMHzem.freqintS0Fitted mean flux density at the reference frequencymJyphot.flux.density;em.radiofloataloFitted spectral index for f < fbrspect.indexfloate_aloUncertainty in fitted spectral index for f<fbrstat.errorfloatfrbrFitted break frequencyMHzem.freqintb_frbr? Lower limit of 68% uncertainty range for break frequencyMHzstat.error;instr.bandwidth;stat.minintnullableB_frbr? Upper limit of 68% uncertainty range for break frequencyMHzstat.error;instr.bandwidth;stat.maxintnullableahiFitted spectral index for f > fbrspect.indexfloate_ahiUncertainty in fitted spectral index for f>fbrstat.errorfloatsigunlgS? Fitted extra scatter of lg(S) (sigma_unkn_lgS_stat.error;meta.modelledfloatnullableJ/A+A/635/A75/table3plFitted parameters for the pulsars with spectra modeled with a power-law with two breaksf0Reference frequencyMHzem.freqintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of pulsar as in ATNF catalogue v.1.51meta.id;meta.maincharFreqRngLoLower edge of the spectral frequency spanMHzem.freqintFreqRngHiUpper edge of the spectral frequency spanMHzem.freqintNNumber of data points in spectrummeta.numberintS0Fitted mean flux density at the reference frequencymJyphot.flux.density;em.radiofloataloFitted spectral index for f < fbr1spect.indexfloate_aloUncertainty in fitted spectral index for f<fbr1stat.errorfloatfrbr1Fitted first break frequencyMHzem.freqintb_frbr1? Lower limit of 68% uncertainty range for the first break frequencyMHzstat.error;instr.bandwidth;stat.minintnullableB_frbr1? Upper limit of 68% uncertainty range for the first break frequencyMHzstat.error;instr.bandwidth;stat.maxintnullableamidFitted spectral index for frbr1<f<fbr2spect.indexfloate_amidUncertainty in fitted spectral index for frbr1<f< fbr2stat.errorfloatfrbr2Fitted second break frequencyMHzem.freqintb_frbr2? Lower limit of 68% uncertainty range for the second break frequencyMHzstat.error;instr.bandwidth;stat.minintnullableB_frbr2? Upper limit of 68% uncertainty range for the second break frequencyMHzstat.error;instr.bandwidth;stat.maxintnullableahiFitted spectral index for f>fbr2spect.indexfloate_ahiUncertainty in fitted spectral index for f>fbr2stat.errorfloatsigunlgSFitted extra scatter of lg(S) (sigma_unkn_lgS)stat.error;meta.modelledfloat