J/A+A/635/A76ivo://CDS.VizieR/J/A+A/635/A76doi:10.26093/cds/vizier.36350076CDSBondonneau L.Griessmeier J.-M.Theureau G.Bilous A.V.,Kondratiev V.I.Serylak M.Keith M.J.Lyne A.G.2025-09-26T20:01:02Z2020-03-10T10:38:48ZCDS support team

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

cds-question@unistra.frpulsarsradio-sourcesTo date, only 69 pulsars have been identified with a detected pulsed radio emission below 100MHz. A LOFAR-core LBA census and a dedicated campaign with the Nancay LOFAR station in stand-alone mode were carried out in the years 2014-2017 in order to extend the known population in this frequency range. In this paper, we aim to extend the sample of known radio pulsars at low frequencies and to produce a catalogue in the frequency range of 25-80 MHz. This will allow future studies to probe the local Galactic pulsar population, in addition to helping explain their emission mechanism, better characterising the low-frequency turnover in their spectra, and obtaining new information about the interstellar medium through the study of dispersion, scattering, and scintillation. We observed 102 pulsars that are known to emit radio pulses below 200MHz and with declination above -30{deg}. We used the the Low Band Antennas (LBA) of the LOw Frequency ARray (LOFAR) international station FR606 at the Nancay Radio Observatory in stand-alone mode, recording data between 25-80MHz. Out of our sample of 102 pulsars, we detected 64. We confirmed the existence of ten pulsars detected below 100 MHz by the LOFAR LBA census for the first time (Bilous et al., 2019, submitted) and we added two more pulsars that had never before been detected in this frequency range. We provided average pulse profiles, DM values, and mean flux densities (or upper limits in the case of non-detections). The comparison with previously published results allows us to identify a hitherto unknown spectral turnover for five pulsars, confirming the expectation that spectral turnovers are a widespread phenomenon.2020A&A...635A..76Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/635/A76CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/591/A134 : LOFAR census of non-recycled pulsars (Bilous+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/635/A76https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/635/A76http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/635/A76https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/635/A76https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/635/A76http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/635/A76GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/635/A76/table1 (Pulsars detected in this census)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/635/A76/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/635/A76/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/635/A76/table1?GETtext/xml+votable180.050000true3.573958347.77594440.005555555555555556Cone search capability for table J/A+A/635/A76/tablea1 (Pulsars that were not detected in this census.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/635/A76/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/635/A76/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/635/A76/tablea1?GETtext/xml+votable180.050000true19.411087559.24399720.0055555555555555566/426 1676 1949 2787 2858 2943 3150 3157 3162 3552 3616 3621 3731 3872 4163 4227 4352 4403 4556 4584 4598 4831 5955 7391 7821 8068 8121 8277 8539 8964 9040 9240 9282 11371 12259 12747 12939 13053 13065 13152 13191 13218 13405 13719 13921 14122 14273 14346 14362 14415 14549 14842 14924 15009 15304 15499 15646 15679 15751 16996 17247 17955 18136 18153 18947 20166 20574 23830 23994 24040 24185-24186 24360 24428 24541 26520 27554 28106 28135 28226 28872 29387 29530 30312 30604 30657 30941 31244 31311 31591 31623 31717 31829 31898 31933 32048 32452 32647 32704 36540 40366 40667https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/635/A76?format=asciiRadiodefaultJ/A+A/635/A76/table1Pulsars detected in this censusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJNameJ2000 Name (JHHMM+DDMM or JHHMM+DD)meta.id;meta.maincharDNameDiscovery Name (JHHMM+DDMM, JHHMM+DD or BHHMM+DD)meta.idcharP0Pulsar periodstime.periodfloatDMBest-fit dispersion measure calculated using pdmppc.cm**-3phys.dispMeasuredoublee_DMrms uncertainty on DMpc.cm**-3stat.errordoublen_DM[te] Note on DM (1)meta.notechartau/P0Scattering time as estimated using YMW16 (Yao et al., 2017ApJ...835...29Y), at 60MHz divided by the pulsar period, {tau}^clac^_scat_/P0%time.scalefloatDutyCycleEffective width in pulses profiles (based on w50)%src.var.pulsefloatSNRSignal-to-noise-ratio of the detected pulsar profilestat.snrintDurTotal observation lengthmintime.expointSimbadSimbad column added by the CDSmeta.ref.urlcharFreqcCentre frequency of the observationMHzem.freq;obsintElevavgAverage elevation during the observationdegpos.az.alt;stat.meanintFluxmeanMean flux density determined for the corresponding centre frequencymJyphot.flux.density;em.radiointe_FluxmeanError bar of 50% on FluxmeanmJystat.errorintn_FluxmeanNote on Fluxmean (1)meta.notecharFileNameName of the file with reduced pulse profile in subdirectory profilesmeta.id;src.var.pulse;meta.filechar_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/A76/tablea1Pulsars that were not detected in this census.SimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJNameJ2000 Name (JHHMM+DDMM or JHHMM+DD)meta.id;meta.maincharDNameDiscovery Name (JHHMM+DDMM, JHHMM+DD or BHHMM+DD)meta.idcharP0Pulsar periodstime.periodfloatn_P0[*] Note on PO (1)meta.notecharDMDispersion measure (2)pc.cm**-3phys.dispMeasuredoubletau/P0Scattering time divided by the pulsar period, {tau}^calc^_scat_/P0 (3)%time.scalefloatDurTotal duration of the observationmintime.expointElevAverage elevation of the observationdegpos.az.alt;obsintSlimupper limit for the mean flux densitymJystat.maxintn_Slim[te] Note on SLim (4)meta.notechar_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