VSOP Polarization Observing at 1.6 GHz and 5 GHz

Kemball Athol; Flatters Chris; Gabuzda Denise; Moellenbrock George; Edwards Philip; Fomalont Edward; Hirabayashi Hisashi; Horiuchi Shinji; Inoue Makoto; Kobayashi Hideyuki; Murata Yasuhiro

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VSOP Polarization Observing at 1.6 GHz and 5 GHz

机译：VSOP极化在1.6 GHz和5 GHz处观察

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Wepresentanddiscusstheresultsof1.6GHzand5GHztestpolarizationobservationsobtainedwithHALCA,theVLBA,andphasedVLA,specificallytoevaluatethefeasibilityofcalibratingandimagingHALCApolarizationdata.Ouranalysisprovidedthefirstdemonstrationthatcentimeter-wavelengthpolarizationimagingusingHALCAistechnicallyviableforsourceswithsufficientlyhighcorrelatedpolarizedfluxdensities,despiteanumberoffactorswhichconspiretocomplicatethecalibration,includingrelativelylowsensitivity,inabilitytoobservecalibrators,lackofvaryingparallacticangle,andabsenceofredundantmeasurementsonspacebaselines.Thetestdatadescribedherearelimitedandcannotruleoutinstrumentalvariability,butindicatethattheHALCAinstrumentalpolarizationleakageisa??2a?’5%at1.6GHzanda??9a?’11%at5GHz.TheprospectsforeffectivepolarizationcalibrationonfutureorbitingVLBImissionsareencouraging,especiallysinceimprovementsinsensitivityareexpected.

机译：Wepresentanddiscusstheresultsof1.6GHzand5GHztestpolarizationobservationsobtainedwithHALCA，theVLBA，andphasedVLA，specificallytoevaluatethefeasibilityofcalibratingandimagingHALCApolarizationdata.Ouranalysisprovidedthefirstdemonstrationthatcentimeter-wavelengthpolarizationimagingusingHALCAistechnicallyviableforsourceswithsufficientlyhighcorrelatedpolarizedfluxdensities，despiteanumberoffactorswhichconspiretocomplicatethecalibration，includingrelativelylowsensitivity，inabilitytoobservecalibrators，lackofvaryingparallacticangle，andabsenceofredundantmeasurementsonspacebaselines.Thetestdatadescribedherearelimitedandcannotruleoutinstrumentalvariability，butindicatethattheHALCAinstrumentalpolarizationleakageisa ?? 2A？5％at1.6GHzanda ?? 9A？'11％at5GHz.TheprospectsforeffectivepolarizationcalibrationonfutureorbitingVLBImissionsareencouraging，especiallysinceimprovementsinsensitivityareexpected。

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《PASJ: Publications of the Astronomical Society of Japan》 |2000年第6期|共页
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Kemball Athol; Flatters Chris; Gabuzda Denise; Moellenbrock George; Edwards Philip; Fomalont Edward; Hirabayashi Hisashi; Horiuchi Shinji; Inoue Makoto; Kobayashi Hideyuki; Murata Yasuhiro;
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VSOP Polarization Observing at 1.6 GHz and 5 GHz

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