Optical spectrophotometry of the nuclear region of M51

Details Optical spectrophotometry of the nuclear region of M51 Optical spectrophotometry of the nuclear region of M51

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..556r&link_type=abstract

Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 556-574.

Astronomy and Astrophysics

Astrophysics

57

Astronomical Photometry, Astronomical Spectroscopy, Galactic Nuclei, Spectrophotometry, Spiral Galaxies, Astronomical Models, Emission Spectra, H Alpha Line, Hydrogen Clouds, Nitrogen Ions, Radiation Sources, Spectral Line Width

Scientific paper

Long-slit spectrophotometric observations obtained for the spiral galaxy M51 at three position angles are presented, showing a large ratio of forbidden lines N II/H-alpha throughout a nuclear region within a 9 arcsec radius from the center of the galaxy. The kinematics of the gas is discussed, and it is suggested that gas in the nuclear core is ionized by a nonstellar central souarce of radiation. The broad emission lines throughout the central core indicate turbulent velocities of up to 200 km/s, and it appears likely that the central ionizing source in the nucleus is also responsible for these large turbulent velocities.

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