Abstract
view Abstract Citations (17) References (6) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Comparison of Optical and VLA Rotation Curves for Virgo Spirals Rubin, Vera C. ; Kenney, Jeffrey D. ; Boss, Alan P. ; Ford, W. Kent, Jr. Abstract From high-resolution optical CCD spectra we have formed rotation curves for eight spiral galaxies in the Virgo Cluster (NGC 4178, 4237, 4388, 4501, 4568, 4569, 4579, and 4654). A comparison with rotation curves formed from VLA observations shows excellent agreement for the galaxies observed at 21 cm with 15" resolution. However, for galaxies observed at 45" resolution, the 21 cm velocities are lower than the optical velocities at virtually all radii covered by the optical velocities. The initial rise of the rotation curve is often well matched by the low-resolution observations, an unexpected result. A computer program that models the VLA observations confirms that observations at low spatial and velocity resolution will produce low rotation velocities, especially in the region of the turnover of the rotation curve. Publication: The Astronomical Journal Pub Date: October 1989 DOI: 10.1086/115211 Bibcode: 1989AJ.....98.1246R Keywords: Galactic Rotation; Spiral Galaxies; Very Large Array (Vla); Virgo Galactic Cluster; Visual Observation; Astronomical Catalogs; Centimeter Waves; High Resolution; Astronomy; GALAXIES: INTERNAL MOTIONS full text sources ADS | data products SIMBAD (8) NED (8)
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