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The braided jets in the spiral galaxy NGC 4258
Cecil, Gerald; Wilson, Andrew S.; Tully, R. B.
AA(North Carolina, University, Chapel Hill), AB(Maryland, University, College Park), AC(Hawaii, University, Honolulu)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 365-377. Research supported by NSF. (ApJ Homepage)
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NASA/STI Keywords:
Interstellar Matter, Magnetic Fields, Radio Jets (Astronomy), Spiral Galaxies, X Ray Sources, Bremsstrahlung, Emission Spectra, Flow Velocity, H Alpha Line, Ionized Gases, Spectrophotometry
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The Hawaii Imaging Fabry-Perot Interferometer is used to synthesize 44,000 H-alpha and forbidden N II emission-line profiles at velocity resolution 68 km/s FWHM across the disk of the nearby Seyfert/LINER galaxy NGC 4258, including the prominent 'four-branched jet' that extends to 10 and 5 kpc radii in the radio continuum and optical emission lines, respectively. The mean velocities of ionized gas associated with the jets are found to deviate by at most 60 km/s along the line of sight, which may be compared to the about 25 km/s radial motions that result from the bar-forced streaming. The jet flow NNW of the nucleus is kinematically isolated, and a vigorous interaction between this jet and molecular gas in the inner 0.6 kpc radius of the galaxy is confirmed. The existence of three tightly wrapped strands, which 'open out' close to the turnover point of the disk rotation curve, is inferred. The helical, braided structure is seen in both images and velocity maps, providing evidence for motion along the strands, and suggesting that the braid pattern is driven by fluid instabilities.

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