J/MNRAS/473/4436ivo://CDS.VizieR/J/MNRAS/473/4436doi:10.26093/cds/vizier.74734436CDSJankowski F.Van Straten W.Keane E.F.Bailes M.Barr E.D.,Johnston S.Kerr M.2024-08-17T20:21:41Z2018-03-29T14:30:49ZCDS support team

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

cds-question@unistra.frastronomical-modelspulsarsradio-continuum-emissionradio-sourcesstellar-spectral-typesWe present a study of the spectral properties of 441 pulsars observed with the Parkes radio telescope near the centre frequencies of 728, 1382 and 3100MHz. The observations at 728 and 3100MHz were conducted simultaneously using the dual-band 10-50cm receiver. These high-sensitivity, multifrequency observations provide a systematic and uniform sample of pulsar flux densities. We combine our measurements with spectral data from the literature in order to derive the spectral properties of these pulsars. Using techniques from robust regression and information theory, we classify the observed spectra in an objective, robust and unbiased way into five morphological classes: simple or broken power law, power law with either low- or high-frequency cut-off and log-parabolic spectrum. While about 79 per cent of the pulsars that could be classified have simple power-law spectra, we find significant deviations in 73 pulsars, 35 of which have curved spectra, 25 with a spectral break and 10 with a low-frequency turn-over. We identify 11 gigahertz-peaked spectrum (GPS) pulsars, with 3 newly identified in this work and 8 confirmations of known GPS pulsars; 3 others show tentative evidence of GPS, but require further low-frequency measurements to support this classification. The weighted mean spectral index of all pulsars with simple power-law spectra is -1.60+/-0.03. The observed spectral indices are well described by a shifted log-normal distribution. The strongest correlations of spectral index are with spin-down luminosity, magnetic field at the light-cylinder and spin-down rate. We also investigate the physical origin of the observed spectral features and determine emission altitudes for three pulsars.2018MNRAS.473.4436Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/473/4436CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/473/4436https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/473/4436http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/473/4436https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/473/4436https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/473/4436http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/473/4436GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/473/4436/tablec1 (Spectral parameters for 441 radio pulsars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/473/4436/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/473/4436/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/473/4436/tablec1?GETtext/xml+votable180.050000true60.4653333-76.13716670.0055555555555555565/7564 10419 6/4163 4227 4403 4750 18947 19025 19994 20574 20767 20817 21455 21504 21519 21957 22058 23622 23830 23994 24360 24708 25251 26656 26824 27554 28226 28692 28697 28730 28735 28749 28807-28809 28812 28818 28822 28825-28826 28847 28849 28854 28864 28872 28876 28889-28890 28900-28901 28913 28918-28919 28921 28927 28945-28946 29059 29082 29088 29090 29094 29097 29099 29103 29108 29112 29118 29130 29145-29146 29162 29180 29213 29383 29460 29464-29465 29487 29495 29505 29509 29511 29516 29521-29522 29524-29525 29527 29529 29532 29534-29535 29550 29556 29559 29575 29789 29863 29883 29929 30210-30211 30215 30217-30219 30221 30223 30234 30240-30241 30244-30246 30252 30264-30265 30268-30269 30286 30309 30312-30313 30328 30330 30357 30416-30417 30419 30430 30592 30594 30619 30621 30641 30690 32888 33030 33098 33137 34034 36946 36948 36952 37062 37082 37161 37193-37194 37207 37224 37232 37244 37332 37338-37339 37341 37360-37361 37364-37365 37374-37375 37435 37646 37701 37704 37714 37717 37721 37745-37746 37758 37787 37828 37830 37848 37873-37874 37884 37898 37900-37901 37903 37905-37906 37910 37921 37923-37924 37929-37931 37946 37948 37953 37957 37967 37990 38018 38020 38048 38060 38081 38113 38133 38179 38250 38425 38428 38597 38711 39004 39216 39235 39269 39275 39280 39367 39369 39414 39784 39789 39977 39992 39996 40104 40366 40667 40680 41271 41386 41431 41464 41535 41583-41584 41593 41595 41607 41619 41630 41653-41654 41656 41660 41672 41674 41681-41685 41689 41697 41701 41704 41710 41712 41727 41736 41756-41758 41765 41778 41781 41799 41803-41806 41809-41811 41815 41818 41840 41859 41894 42025 42092 42158-42159 42169 42171 42178 42189 42194 42196 42206 42208 42214-42215 42217-42218 42220 42223-42224 42226-42229 42231-42232 42236 42288 42306 42356 42366-42368 42371 42378 42382-42384 42386 42391 42394 42396-42397 42401 42422 42432-42433 42435 42438 42450 42457 42460 42466 42471 42477 42481 42487 42496 42503 42510 42513 42515 42533 42560 42583 42821 42832 43012 43015 43019 43044 43060 43107 43110 43113 43144 43160 43169 43272 45198 45285 45771 47275 47484 47524 47741 47759 47803 47885 47975 48080 48158 48882 48928 49053 491294.823778549237989e-25 2.0540815036043594e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/473/4436?format=asciiRadiodefaultJ/MNRAS/473/4436/tablec1Spectral parameters for 441 radio pulsarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPSRJPulsar name (J2000) (JHHMM+DDMMA)meta.id;meta.maincharl_S728? Limit flag on S728meta.code.errorcharS728? Flux density at 728MHzmJyphot.flux.density;em.radio.400-750MHzfloatnullablee_S728? Uncertainty of flux density at 728MHzmJystat.errorfloatnullablel_S1382? Limit flag on S1382meta.code.errorcharS1382? Flux density at 1382MHzmJyphot.flux.density;em.radio.750-1500MHzdoublenullablee_S1382? Uncertainty of flux density at 1382MHzmJystat.errorfloatnullablel_S3100? Limit flag on S3100meta.code.errorcharS3100? Flux density at 3100MHzmJyphot.flux.density;em.radio.1500-3000MHzfloatnullablee_S3100? Uncertainty of flux density at 3100MHzmJystat.errorfloatnullableClass? Spectral classification of pulsarspect.indexcharnu-startFrequency range start for classificationGHztime.start;em.freqfloatnu-endFrequency range end for classificationGHztime.end;em.freqfloatalpha? Spectral index for simple pl spectraspect.indexfloatnullablee_alpha? Uncertainty of spectral indexstat.error;pos.eq.rafloatnullablem728? Robust modulation index at 728MHzspect.index;em.radio.400-750MHzfloatnullablee_m728? Low uncertainty on m728stat.errorfloatnullableE_m728? High uncertainty on m728stat.error;stat.maxfloatnullablem1382? Robust modulation index at 1382MHzspect.index;em.radio.750-1500MHzfloatnullablee_m1382? Low uncertainty on m1382stat.errorfloatnullableE_m1382? High uncertainty on m1382stat.error;stat.maxfloatnullablem3100? Robust modulation index at 3100MHzspect.index;em.radio.3-6GHzfloatnullablee_m3100? Low uncertainty on m3100stat.errorfloatnullableE_m3100? High uncertainty on m3100stat.error;stat.maxfloatnullableSimbadSimbad 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.main