J/AJ/121/1192ivo://CDS.VizieR/J/AJ/121/1192doi:10.26093/cds/vizier.51211192CDSMcGary R.S.Brisken W.F.Fruchter A.S.Goss W.M.Thorsett S.E.2023-04-06T16:50:41Z2009-03-04T15:11:46ZCDS support team

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

cds-question@unistra.frpulsarsproper-motionsinterferometryThe pulsar velocity distribution provides information about the binary history of pulsar progenitors, as well as the asymmetries of the supernova events in which pulsars are born. Studies of local pulsars present a biased view of this distribution, because they preferentially select low-velocity pulsars that have remained near their birthplaces in the Galactic plane. Using the VLA, we have studied the proper motions of a large sample of distant pulsars. These pulsars are generally faint, and the expected proper motions are small. In this paper, we describe the data analysis techniques that we have developed to allow precise astrometric measurements of faint sources with the VLA. These techniques include "gating" the VLA correlator to increase the signal-to-noise ratio of the pulsar by gathering data only during the pulse. Wide-field imaging techniques, including multiband imaging to account for bandwidth smearing, were used to allow identification of multiple in-beam background sources for astrometric calibration. We present the analysis of three pulsars and demonstrate that astrometric accuracy of about 10 mas can be obtained for individual sources with our technique, allowing measurement of proper motions with errors of only a few milliarcseconds per year over our 7 year baseline.2001AJ....121.1192Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/121/1192CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/121/1192https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/121/1192http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/121/1192https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/121/1192https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/121/1192http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/121/1192GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/121/1192/table1 (Reference sources for proper motions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/1192/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/1192/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/1192/table1?GETtext/xml+votable180.050000true140.766256.64961110.0055555555555555565/12020 6/4163 4166 28133 28135https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/121/1192?format=asciiRadiodefaultJ/AJ/121/1192/table1Reference sources for proper motionspmRA? Proper Motion along RAmas/yrpos.pm;pos.eq.raintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePulsar name, Bhhmm+dd (1)meta.id;meta.maincharF20The 20cm flux density of referencemJyphot.flux.density;em.radio.1500-3000MHzfloate_F20Uncertainty in F20mJystat.errorfloatRAJ2000Right Ascension of reference (J2000)pos.eq.ra;meta.maine_RAJ2000Uncertainty in RAssstat.error;pos.eq.rafloatDEJ2000Declination of reference (J2000)pos.eq.dec;meta.maine_DEJ2000Uncertainty in DEsarcsecstat.error;pos.eq.decfloatdRARA offset from pulsar positionarcsecpos.eq.ra;arith.diffintdDEDec offset from pulsar positionarcsecpos.eq.dec;arith.diffinte_pmRA? Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.raintnullablepmDE? Proper Motion along Decmas/yrpos.pm;pos.eq.decintnullablee_pmDE? Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decintnullableJ/AJ/121/1192/table2Proper motions of B0919+06, B1237+25 and B1937-26recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePulsar Namemeta.id;meta.maincharprimaryF20The 20cm flux densitymJyphot.flux.density;em.radio.1500-3000MHzfloate_F20Uncertainty in F20mJystat.errorfloatGF20Gated 20cm flux densitymJyphot.flux.density;em.radio.1500-3000MHzfloate_GF20Uncertainty in GF20mJystat.errorfloatEpoch1Epoch of observation (1900+)yrtime.epoch;obsintn_Epoch1[a] a: gated observationmeta.notecharEpoch2Epoch of observation (1900+)yrtime.epoch;obsintn_Epoch2[a] a: gated observationmeta.notecharEpoch3Epoch of observation (1900+)yrtime.epoch;obsintn_Epoch3[a] a: gated observationmeta.notecharEpoch4? Epoch of observation (1900+)yrtime.epoch;obsintnullablen_Epoch4[a] a: gated observationmeta.notecharNumNumber of reference objects usedmeta.number;instr.setupintpmRAProper motion along RAmas/yrpos.pm;pos.eq.rafloate_pmRAUncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along Decmas/yrpos.pm;pos.eq.decfloate_pmDEUncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatCovCovariance of RA & Dec proper motion componentsstat.correlationfloat