Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.5909m&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #59.09; Bulletin of the American Astronomical Society, Vol. 26, p.958
Astronomy and Astrophysics
Astronomy
Scientific paper
We have detected the infrared fine structure transitions of [ArIII] 9.0 microns, [SIV] 10.5 microns, and [NeII] 12.8 microns in the Seyfert 2 galaxy NGC 1068. The observations were made with a spectral resolution of lambda /Delta lambda = 2000 using the Cornell built instrument SpectroCam-10 at the Palomar Observatory 5 m telescope. The IR fine structure lines are normally collisionally excited and optically thin, so they are excellent probes of the physical conditions in the ISM. In addition, they are less affected by extinction than optical lines and can yield information on even the most heavily obscured regions. While most IR fine structure lines are inaccessible from the ground, our results demonstrate the ability of ground-based telescopes to measure at least a few of these lines for use as diagnostics of activity in galaxies. Extending this work to the dusty infrared luminous galaxies may help to answer the question of whether they are powered by AGNs or starbursts.
Hayward Thomas L.
Houck James R.
Miles John Wesley
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