J/A+A/644/A73ivo://CDS.VizieR/J/A+A/644/A73doi:10.26093/cds/vizier.36440073CDSWang P.F.Han J.L.Han L.Cai B.Y.Wang C.Wang T.Chen X.Zhou D.J.,Yu Y.Z.Han J.Xu J.Gao X.Y.Hong T.Hou L.G.Dong B.2021-03-04T07:47:19Z2020-12-02T08:04:56ZCDS support team

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

cds-question@unistra.frinterstellar-mediumpulsarsMost of pulsar nulling observations were conducted at frequencies lower than 1400MHz. We aim to understand the nulling behaviors of pulsars at relatively high frequency, and to check if nulling is caused by a global change of pulsar magnetosphere. 20 bright pulsars are observed at 2250MHz with unprecedented lengths of time by using Jiamusi 66m telescope. Nulling fractions of these pulsars are estimated, and the null and emission states of pulses are identified. Nulling degrees and scales of the emission-null pairs are calculated to describe the distributions of emission and null lengths. Three pulsars, PSRs J0248+6021, J0543+2329 and J1844+00, are found to null for the first time. The details of null-to-emission and emission-to-null transitions within pulse window are first observed for PSR J1509+5531, which is a small probability event. A complete cycle of long nulls for hours is observed for PSR J1709-1640. For most of these pulsars, the K-S tests of nulling degrees and nulling scales reject the hypothesis that null and emission are of random processes at high significance levels. Emission-null sequences of some pulsars exhibit quasi-periodic, low-frequency or featureless modulations, which might be related to different origins. During transitions between emission and null states, pulse intensities have diverse tendencies for variations. Significant correlations are found for nulling fraction, nulling cadence and nulling scales with the energy loss rate of the pulsars. Combined with the nulling fractions reported in literatures for 146 nulling pulsars, we found that statistically large nulling fractions are more tightly related to pulsar period than to characteristic age or energy loss rate.2020A&A...644A..73Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/644/A73CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/618/A186 : Dynamic spectra of 10 pulsars (Wang+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/644/A73https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/644/A73http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/644/A73https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/644/A73https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/644/A73http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/644/A73GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/644/A73/tablec1 (Nulling fractions for 214 pulsars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/644/A73/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/644/A73/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/644/A73/tablec1?GETtext/xml+votable180.050000true8.5369167-7.36483330.005555555555555556Cone search capability for table J/A+A/644/A73/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/644/A73/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/644/A73/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/644/A73/list?GETtext/xml+votable180.050000true8.536959722-7.3648358330.0055555555555555566/426 2573 2787 3162 3302 4163 4227 4403 4556 4831 5955 6262 8068 9040 9282 11371 12500 12513 12526 12586 12912 12939 12961 13053 13152 13218 13287 13405 13719 13921 14122 14251 14309 14346 14362 14549 15377 15499 16996 17247 17378 17532 20096 20166 20574 21171 21957 22824 23727 23830 24040 24186 24360 24500 27554 28135 28226 28692 28740 28812 28816 28825-28826 28832 28847 28863 28872 28878 28921 28945 29034 29059 29090 29103 29138 29157 29162 29176 29248 29387 29461 29509 29511 29516 29520 29550 29556 29617 29653 29680 29746 29789 29859 29863 29897 29929 30055 30116 30210 30215 30218 30245 30257-30258 30265 30300 30333 30355 30364 30400 30420 30425 30501 30506 30621-30622 30631 30657 30662 30671 30708 30941 31244 31311 31623 31802 31809 31829 31870 31933 31983 32007 32048 32086 32548 33030 33112 36540 37175 37361 37714 37745 37900 37905 37933 37946 38000 38020 38081 38250 38594 39275 39280 39342 39389 39789 39886 39992 40366 40432 40667 41212 41271 41470 41535 41540 41561 41583 41654 41656 41672 41689 41695-41696 41710 41736 41756 41782 41819 41829 41871 41929 41939 42165 42196 42222 42228 42231 42233 42269 42288 42306 42348 42356 42366 42368 42375 42378 42401 42422 42432 42466 42487 42542 42592 42676 42772 42832 43025 43044 43219 48928https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/644/A73?format=asciiRadiodefaultJ/A+A/644/A73/tablec1Nulling fractions for 214 pulsarsPerPeriodstime.periodfloatBNameB name (BHHMM+DDf)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJNameJ Name (JHHMM+DDMM)meta.id;meta.maincharn_JName[+] + for Intermittent pulsarsmeta.notecharDMDispersion measurepc.cm**-3phys.dispMeasure;instr.dispersionfloatfn? Null fraction%stat.fit.paramfloatnullableRefReferencemeta.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/644/A73/refsReferencesRefReference codemeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/A+A/644/A73/listList of fits filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePSR namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNxNumber lines for the spectrummeta.number;phys.atmol.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharSimbadSimbad column added by the CDSmeta.ref.urlchar