Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..513s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 513-525.
Astronomy and Astrophysics
Astrophysics
19
Astronomical Spectroscopy, Optical Properties, Plasma Jets, Radio Galaxies, Abundance, Galactic Structure, Hydrogen Clouds, Nebulae, Stellar Spectrophotometry
Scientific paper
Direct photography and digital spectrophotometry have been used to study the blue optical knots associated with the distorted northeast radio jet in NGC 7385. There are at least two emission patches, aligned with the edge of the jet where the gradient in radio flux is steepest. Absolute flux measurements have been obtained of weak emission forbidden lines of O II, O III, and S II of emission lines of HI, and the relatively strong blue continuum coming from these patches. These observations suggest that the material in the knots is metal poor (and thus does not come from the nucleus). The knots are probably interacting with the radio jet, but their exact excitation mechanism and the source of their continuum is uncertain.
Bicknell Geoffrey V.
Bosma Albert
Simkin Susan M.
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