当前位置： 文档下载 > 所有分类 > High Resolution Millimeter-Wave Mapping of Linearly Polarized Dust Emission Magnetic Field当前位置： 文档下载 > 所有分类 > High Resolution Millimeter-Wave Mapping of Linearly Polarized Dust Emission Magnetic FieldWe present 1.3 and 3.3 mm polarization maps of Orion-KL obtained with the BIMA array at approximately 4 arcsec resolution. Thermal emission from magnetically aligned dust grains produces the polarization. Along the Orion ``ridge'' the polarization position
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aHIGHRESOLUTIONMILLIMETER-WAVEMAPPINGOFLINEARLYPOLARIZEDDUSTEMISSION:MAGNETICFIELDSTRUCTUREINORIONR.Rao1andR.M.CrutcherDepartmentofAstronomy,UniversityofIllinois,Urbana-Champaign,IL61801andR.L.PlambeckandM.C.H.WrightRadioAstronomyLaboratory,UniversityofCalifornia,Berkeley,CA94720ABSTRACTWepresent1.3and3.3mmpolarizationmapsofOrion-KLobtainedwiththeBIMAarrayatapproximately4′′resolution.Thermalemissionfrommagneticallyaligneddustgrainsproducesthepolarization.AlongtheOrion“ridge”thepolarizationpositionanglevariessmoothlyfromabout10 to40 ,inagreementwithpreviouslowerresolutionmaps.InasmallregionsouthoftheOrion“hotcore,”however,thepositionanglechangesby90 .Thisabruptchangeinpolarizationdirectionisnotnecessarilythesignpostofatwistedmagnetic eld.Rather,inthislocalizedregionprocessesotherthantheusualDavis-Greensteinmechanismmightalignthedustgrainswiththeirlongaxesparallelwiththe eld,orthogonaltotheirnormalorientation.Subjectheadings:magnetic elds—polarization—instrumentation:polarimeters—techniques:interferometric—stars:formation—ISM:magnetic elds
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