Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002newar..46..207s&link_type=abstract
New Astronomy Reviews, Volume 46, Issue 2-7, p. 207-210.
Astronomy and Astrophysics
Astronomy
Scientific paper
We have examined the relative emission line strengths of [NII], [OI], and [SII] for selected regions in three nearby objects, all of which have published radio images showing detailed correspondence between the disrupted morphology of the ionized gas clouds and the radio features at spatial resolutions of <=1h-1 kpc. In all of these cases the clouds have measured velocities which differ from those of the ambient medium and are directed away from the impinging radio plasma. In two of these objects the values for [NII]:H/α are significantly lower than those usually found for active galaxy nuclei (and EELG) with similar values of [OI] and [SII]. None of the published models which calculate emission line ratios for shock heating and/or UV continuum excitation and ionization reproduce the extreme values of the [NII]: H/α ratios which we find here. We postulate that the extremely low emissivity for [NII] which we see in these two objects may arise from the way in which the radio jet energized the interstellar gas in the galaxy.
Grimberg B. I.
Simkin Susan M.
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