J/ApJ/952/151ivo://CDS.VizieR/J/ApJ/952/151CDSMitra D.Melikidze G.I.Basu R.2025-10-01T06:29:29Z2025-09-19T16:53:33ZCDS support team

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

cds-question@unistra.frpulsarsradio-astronomypolarimetrysurveysWe have observed 123 pulsars with periods longer than 0.1s in the Meterwavelength Single Pulse Polarimetric Emission Survey. In this work, a detailed study of the polarization behavior of these pulsars has been carried out. We were able to fit the rotating vector model to the polarization position angle sweeps in 68 pulsars, and in 34 pulsars the emission heights could be measured. In all cases the radio emission was constrained to arise below 10% of the light cylinder radius. In pulsars with low spin-down energy loss, dE/dt<10^34^erg/s, we found the mean fractional linear polarization of the individual time samples in single pulses to be around 0.57 (57%), which is significantly larger than the fractional linear polarization of 0.29 (29%) obtained from the average profiles. On the other hand, the mean fractional circular polarization of the individual time samples in single pulses is around 0.08 (8%), similar to the measurements from the average profiles. To explain the observed polarization features, we invoke the partially screened vacuum gap model of pulsars, where dense spark-associated plasma clouds exist with high pair plasma multiplicity, with significant decrease of density in the regions between the clouds that are dominated by iron ions. The coherent radio emission is excited by curvature radiation from charge bunches in these dense plasma clouds and escape as linearly polarized waves near cloud boundaries. We suggest that the circular polarization arises due to propagation of waves in the low-pair-multiplicity, ion-dominated inter-cloud regions.2023ApJ...952..151Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/952/151CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/psr : ATNF Pulsar Catalogue (Manchester+, 2005)J/MNRAS/301/235 : Multifrequency polarimetry of 300 pulsars (Gould+, 1998)J/A+A/445/243 : Pulsar subpulse modulation data at 21cm (Weltevrede+, 2006)J/MNRAS/391/1210 : Characteristics of energetic pulsars (Weltevrede+, 2008)J/MNRAS/474/4629 : Polarimetry of pulsars from 1.4GHz obs. (Johnston+, 2018)J/MNRAS/489/1543 : Arecibo polarimetric single-pulse survey (Olszanski+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/952/151https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/952/151http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/952/151https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/952/151https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/952/151http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/952/151GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/952/151/table1 (The measurements of 68 pulsars from the Meterwavelength single-pulse Polarimetric Emission Survey (MSPES) where it was possible to obtain suitable rotating vector model (RVM) fits to the polarization position angle (PPA) traverse)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/952/151/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/952/151/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/952/151/table1?GETtext/xml+votable180.050000true8.537125-7.36555560.005555555555555556Cone search capability for table J/ApJ/952/151/table2 (The measurements of the average fractional single pulse (SP) polarization --updated version of the table)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/952/151/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/952/151/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/952/151/table2?GETtext/xml+votable180.050000true8.537125-7.36555560.0055555555555555566/426 4163 4227 12259 12526 12939 13405 13719 14346 16996 17247 17378 17532 20166 20574 21171 21504 23727 23830 23994 24040 24186 24360 25251 27554 28135 28226 28692 28749 28795 28825 28843 28864 28872 28945 29059 29387 29521 29550 29617 29625 29653 29680 29789 29863 29929 30252 30258 30300 30303 30333 30641 30657 30691 30941 31809 31829 31933 36540 37876 38250 38425 38711 39342 39789 39977 40432 40667 40680 42288 42306 42356 42366 42384 42450 42583 42592 42658 42676 42821 42832 42914 43219 43261 44308 46787 48080 48928 49129https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/952/151?format=asciiRadiodefaultJ/ApJ/952/151/table1The measurements of 68 pulsars from the Meterwavelength single-pulse Polarimetric Emission Survey (MSPES) where it was possible to obtain suitable rotating vector model (RVM) fits to the polarization position angle (PPA) traverserecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/68] Index numbermeta.idintFreq[333/618] FrequencyMHzem.freqintPSRPulsar identifier (JHHMM-DDMM)meta.id;meta.maincharprimarym_PSRNumber of measurements for this PSRmeta.numberintnullablePer[0.1/8.51] Periodstime.periodfloatchi2[0.6/273.7] Minimum {chi}^2^ fit valuestat.fit.chi2;stat.minfloatphil[-172/-1.1] Phase of leading edgedegpos.phaseAngfloate_phil[0.1/0.8] Uncertainty in phildegstat.error;pos.phaseAngfloatphit[1.2/103.7] Phase of trailing edgedegpos.phaseAngfloatSimbadSimbad column added by the CDSmeta.ref.urlcharh[47/2530]? Emission height estimatekmphys.sizeintnullablee_phit[0.1/0.8] Uncertainty in phitdegstat.error;pos.phaseAngfloatphideg[-31.3/58.5] Phase of the steepest gradiant pointdegpos.phaseAngfloate_phideg[0.1/70] Uncertainty in phideg (1)degstat.error;pos.phaseAngfloatDelphi[-18/48]? Shift between profile midpoint and steepest gradiant (SG) pointdegpos.phaseAng;arith.difffloatnullablee_Delphi[0.1/15]? Uncertainty in Delphi (1)degstat.error;pos.phaseAng;arith.difffloatnullablee_h[23/1200]? Uncertainty in h (1)kmstat.error;phys.sizeintnullableATNFDisplay data from the ATNF pulsar cat. (B/psr)meta.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/ApJ/952/151/table2The measurements of the average fractional single pulse (SP) polarization --updated version of the tablePSRPulsar identifier (JHHMM-DDMM)meta.id;meta.maincharprimarySimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_PSRNumber of measurements for this PSRmeta.numberintnullableFreq[333/618] FrequencyMHzem.freqintEdot[0.003/14300]? Spindown energy loss; 10^31^erg/s1e-24Wphys.energy;time;arith.ratiodoublenullableNsamp[91/114821] Number of SP samples (1)meta.numberintL/I[0.2/0.81] Mean fractional linear polarizationphys.polarization.linear;stat.mean;arith.ratiofloate_L/I[0.09/0.3] Uncertainty in L/Istat.error;phys.polarization.linear;stat.meanfloatV/I[-0.4/0.3] Mean circular polarizationphys.polarization.circular;stat.mean;arith.ratiofloate_V/I[0.1/0.4] Uncertainty in V/Istat.error;phys.polarization.circular;stat.meanfloatabs(V/I)[0.09/0.4] Mean absolute circular polarization, |V|/Iphys.polarization.circular;stat.mean;arith.ratiofloate_abs(V/I)[0.07/0.2] Uncertainty in abs(V/I)stat.error;phys.polarization.circular;stat.meanfloatATNFDisplay data from the ATNF pulsar cat. (B/psr)meta.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.main