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Date and Time of the Query: 2019-04-25 T09:48:54 PDT
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For refcode 1989AJ.....98.1246R:
Retrieve 8 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1989AJ.....98.1246R A COMPARISON OF OPTICAL AND VLA ROTATION CURVES FOR VIRGO SPIRALS VERA C. RUBIN Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road N.W., Washington, DC 20015 JEFFREY D. KENNEY Owens Valley Radio Observatory, California Institute of Technology, Pasadena, California 91125 ALAN P. BOSS AND W. KENT FORD JR. Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road N.W., Washington, DC 20015 Received 4 May 1989; revised 15 June 1989 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.
Retrieve 8 NED objects in this reference.
Please click here for ADS abstract

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