VSOP Polarization Observing at 1.6 GHz and 5 GHz

Publications of the Astronomical Society of Japan

Gabuzda, Denise⁵  Edwards, Philip²  Inoue, Makoto³  Flatters, Chris¹  Horiuchi, Shinji³  Kemball, Athol¹  Hirabayashi, Hisashi²  Murata, Yasuhiro²  Moellenbrock, George¹  Fomalont, Edward⁴  Kobayashi, Hideyuki³ 

[1] National Radio Astronomy Observatory, Socorro, NM 87801, USA;The Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229-8510;National Astronomical Observatory, Mitaka, Tokyo 181-8588;National Radio Astronomy Observatory, Charlottesville, VA 22903, USA;Joint Institute for VLBI in Europe, 7991 PD Dwingeloo, The Netherlands

关键词: "galaxies: active";    "galaxies: radio";    instruments;    quasars;    "radio sources: general";    spacecraft;   

DOI  :  10.1093/pasj/52.6.1055

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Wepresentanddiscusstheresultsof1.6GHzand5GHztestpolarizationobservationsobtainedwithHALCA,theVLBA,andphasedVLA,specificallytoevaluatethefeasibilityofcalibratingandimagingHALCApolarizationdata.Ouranalysisprovidedthefirstdemonstrationthatcentimeter-wavelengthpolarizationimagingusingHALCAistechnicallyviableforsourceswithsufficientlyhighcorrelatedpolarizedfluxdensities,despiteanumberoffactorswhichconspiretocomplicatethecalibration,includingrelativelylowsensitivity,inabilitytoobservecalibrators,lackofvaryingparallacticangle,andabsenceofredundantmeasurementsonspacebaselines.Thetestdatadescribedherearelimitedandcannotruleoutinstrumentalvariability,butindicatethattheHALCAinstrumentalpolarizationleakageis∼2−5%at1.6GHzand∼9−11%at5GHz.TheprospectsforeffectivepolarizationcalibrationonfutureorbitingVLBImissionsareencouraging,especiallysinceimprovementsinsensitivityareexpected.

【 授权许可】

Unknown