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We report 0.9-1.4 micron spectroscopic observations of NGC1068 collectedduring the commissioning phase of the near infrared camera spectrometer (NICS)of the Telescopio Nazionale Galileo (TNG). These yielded the firstextragalactic measurement of [PII] (1.188 micron) line emission. In the central0.75"x2" the [FeII]/[PII] line-intensity ratio is close to unity, similar tothat measured in the Orion bar and a factor of about 20 smaller than insupernova remnants. This indicates that most of iron is locked into grains and,therefore, argues against shock excitation being the primary origin of [FeII]line emission in the central regions of NGC1068.  We propose the [FeII]/[PII] ratio as a simple and effective tool to study andperhaps resolve the long debated questions related to the origin of [FeII] lineemission and, more generally, to constrain the role of shock excitation inactive galaxies.Comment: 4 pages, accepted for publication in A&

astronomy and astrophysics

NICS-TNG infrared spectroscopy of NGC 1068: The first extragalactic measurement of [ P$ $II] and a new tool to constrain the origin of [ Fe$ $II] line emission in galaxies