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Date and Time of the Query: 2019-04-24 T19:38:57 PDT
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For refcode 1991ApJ...368...60P:
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1991ApJ...368...60P THE UNIVERSAL GALAXY ROTATION CURVE MASSIMO PERSIC Osservatorio Astronomico di Trieste AND PAOLO SALUCCI Physics Department, University of Durham Received 1990 June 11; accepted 1990 July 17 ABSTRACT Analyzing an extended set of selected galaxy rotation curves (with - 17.5 >= M_B_> >= -23.2), we find that for a given luminosity the rotation curves of spiral galaxies within the optical radius are a universal function, V(R) ~ 200(L_B_/L_B*_)^1/4^{1 + [0.12 - 0.24 log (L_B_/L_B*_)](R/R_max_ - 1)} km s^-1^ (where L_B*_ = 6 x 10^10^h^-2^_50_ L_B__sun__ and R_max_ = 2.2 disk length scales are two suitable parameterization constants). This result implies strong systematic variations of both the amplitude and the profile of the circular velocity with luminosity, faint (bright) galaxies having low (high) velocities and steep (shallow) velocity gradients. Because luminous disks are self-similar, the observed progression of the shape of rotation curves with luminosity suggests that the dark-to-visible interplay varies with luminosity. Subject headings: galaxies: internal motions - galaxies: structure
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