Other
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..131c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 1, 1984, p. 131-137.
Other
11
Astronomical Spectroscopy, Galactic Nuclei, Gas Flow, Ionized Gases, Spiral Galaxies, Charge Coupled Devices, Red Shift, Seyfert Galaxies, Spatial Resolution
Scientific paper
Long-slit optical spectra were obtained at 3.5 A resolution with a charge-coupled device along four position angles through the nucleus of the spiral galaxy M51. Forbidden-line profiles reveal that a significant fraction of the ionized gas in the spatially resolved region within a 6-arcsec radius of the center cannot be bound to the nucleus. Two velocity components are identified. One is centered on the systemic average, diffusely distributed, with emission detected at velocities displaced up to + or - 700 km/s from the line center. The other is a remarkable discrete velocity component spatially localized at about 2.5-arcsec SSE of the nucleus, redshifted about 550 + or - 50 km/s from systemic, with excitation representative of the nuclear region, and an internal velocity dispersion of about 170 km/s; it must be a transient phenomenon on a time scale of less than one million years.
Cecil Gerald
Rose James A.
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