Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..457o&link_type=abstract
Astronomy and Astrophysics 288, 457-465 (1994)
Astronomy and Astrophysics
Astrophysics
139
Line: Formation, Line: Identification, Galaxies: Active, Galaxies: Individual: Circinus, Galaxies: Nuclei, Infrared: Galaxies
Scientific paper
We present observations of visible ([FeVII], [FeX], [FeXI], [SVIII]) and near infrared ([SIX], [SiVI], [CaVIII], [SiVII], [SiIX]) coronal lines in the Circinus galaxy. The number of detected lines, their velocity profiles, and their spatial distribution pose tight constraints on models of the coronal line region (CLR), and lead to several important conclusions. We can exclude fast shocks and hot stars (warmers) as the origin of the coronal line emission, and find convincing (although not conclusive) evidence against a hot, collisionally ionized plasma. The CLR appears to be a dense (N_e_=~250cm^-3^), compact (diameter=~10pc), dustless region photoionized by the nuclear continuum which must be remarkably flat (Lnu_=~ν^-0.5^) around 300eV.
Marconi Alessandro
Moorwood Alan F. M.
Oliva Ernesto
Salvati Marco
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