Statistics – Computation
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329...38c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 1, 1988, p. 38-65.
Statistics
Computation
53
Active Galactic Nuclei, Gas Dynamics, Shock Waves, Spiral Galaxies, Computational Astrophysics, Ionized Gases, X Ray Sources
Scientific paper
Kinematics of high-velocity (≡1500 km s-1) N+ were mapped across the Seyfert-like narrow-line region (9" radius) at the center of the active spiral galaxy M51 (NGC 5194). A CCD and imaging Fabry-Perot interferometer were used in subarcsecond seeing at 65 km s-1 resolution. Two Hα velocity channels were also recorded. Complementary long-slit CCD spectroscopy provides S+ densities and N+ profiles. Line intensity, line width, gas excitation and the radio continuum peak in an extranuclear cloud (XNC) ≡4" south of the nucleus. The analysis shows that two superposed cloud systems, comprising ≡4000 M_sun; of ionized gas with velocity dispersion ≡140 km s-1, are expanding at ≡500 km s-1 in the disk of the galaxy. The emission morphology, excitation distribution, and positional variation of the N+ kinematics in the XNC resemble those of galactic Herbig-Haro objects, and plausibly arise from thermalization of the kinetic energy of a directed nuclear outflow along well-defined shock fronts in the ambient medium.
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