Radial Velocity of Galaxy NGC7531
A data frame with 323 observations on the following 5 variables.
the east-west coordinate. The origin, (0,0), is near the center of the galaxy, east is negative, west is positive.
the north-south coordinate. The origin, (0,0), is near the center of the galaxy, south is negative, north is positive.
degrees of counter-clockwise rotation from the horizon- tal of the slot within which the observation lies.
signed distance from origin; negative if east-west coordinate is negative.
radial velocity measured in km/sec.
The galaxy data frame records the radial velocity of a spiral galaxy measured at 323 points in the area of sky which it covers. All the measurements lie within seven slots crossing at the origin. The positions of the meas- urements given by four variables (columns).
Buta, R. (1987) The Structure and Dynamics of Ringed Galaxies, III: Surface Photometry and Kinematics of the Ringed Nonbarred Spiral NGC7531. The Astrophysical J. Supplement Ser. Vol. 64, pp. 1–37.
John M. Chambers and Trevor J. Hastie, (eds.) Statistical Models in S, Wadsworth and Brooks, Pacific Grove, CA 1992, pg. 352.