Spatially Extended [P II] 1.188 ??m and [Fe II] 1.257 ??m Emission Lines in a Nearby Seyfert Galaxy NGC1068 Observed with OAO/ISLE

摘要

Wepresent$$J$$-bandlong-slitspectroscopicobservationofNGC1068classifiedasaSeyfert2galaxy.$$J$$-bandobservationswithOAO/ISLEprovidecleardetectionofspatiallyextended[FeII]1.257$$mu$$mand[PII]1.188$$mu$$mlines.Wefoundthat[FeII]1.257$$mu$$m$$/$$[PII]1.188$$mu$$mincreaseswithdistancefromacentralcontinuumpeak.Observedlineratiosaroundthenucleus(continuumpeak)areconsistentwithatypicalvalueexpectedfromphotoionizationmodels,whiletheratiosat3$$a€?$$a€“4$$a€?$$(210a€“280pc)eastandwestofthenucleusareslightlyhigherthanthis.IntheoffnucleusregionofNGC1068wealsofoundapossibleassociationbetween[FeII]1.257$$mu$$m$$/$$[PII]1.188$$mu$$mandtheradiocontinuum.Thissuggestsamildcontributionofshockionizationinducedbyaradiojetoutsidenucleuswhilephotoionizationbythecentralenergysourceisdominantnearthenucleus.