Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..894c&link_type=abstract
(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University
Astronomy and Astrophysics
Astronomy
3
Galactic Nuclei, H Alpha Line, Interstellar Matter, Kinematics, Radio Jets (Astronomy), Seyfert Galaxies, H Ii Regions, Helices, Shock Waves, Wave Excitation
Scientific paper
Results are reported from an experimental study in which 44,000 H-alpha and N II 6583 A forbidden line profiles were synthesized across the disk of the nearby Seyfer galaxy NGC 4258. The spectral grid spans 5 arcmin and resolves velocity structure across the prominent 'four-branched jet.' The jets were found to have total ionized 1.6 x 10 to the 6th solar masses and N II 6583 A forbidden line/H-alpha ratios consistent with shock excitation (1 in the SE jet). Velocity dispersions along the SE jet average 80 km/s, compared to 40 km/s in the H II regions. Gaussian decomposition shows that the internal velocity dispersion of each helix is 100 km/s. Three cycles of wavelength 560 pc and about 170 pc transverse amplitude are observed in the SE. A ballistic interpretation of the braiding at radii within 1 kpc and tangential velocities of 150 km/s yields a deprojected outflow velocity of 1200 km/s, compact binary source masses of O(10 to the 7th) solar masses, and source separation O(10) pc.
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