Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-09
Astronomy and Astrophysics
Astrophysics
4 pages, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20010214
We report 0.9-1.4 micron spectroscopic observations of NGC1068 collected during the commissioning phase of the near infrared camera spectrometer (NICS) of the Telescopio Nazionale Galileo (TNG). These yielded the first extragalactic measurement of [PII] (1.188 micron) line emission. In the central 0.75"x2" the [FeII]/[PII] line-intensity ratio is close to unity, similar to that measured in the Orion bar and a factor of about 20 smaller than in supernova 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 and perhaps resolve the long debated questions related to the origin of [FeII] line emission and, more generally, to constrain the role of shock excitation in active galaxies.
Baffa Carlo
Checcucci A.
Comoretto Gianni
Gavryussev V.
Gennari Sandro
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