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For refcode 1996MNRAS.281...27P:
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Copyright by Royal Astronomical Society. 1996MNRAS.281...27P The universal rotation curve of spiral galaxies - I. The dark matter connection Massimo Persic, Paolo Salucci and Fulvio Stel Osservatorio Astronomico, via GB Tiepolo 11, I-34131 Trieste, Italy SISSA - International School for Advanced Studies, via Beirut 2-41-34013 Trieste, Italy Dipartimento di Astronomia, Universita di Trieste, via Beirut 2-4, I- 34013 Trieste, Italy Accepted 1995 December 8. Received 1995 October 30; in original form 1995 May 26 ABSTRACT We use a homogeneous sample of about 1100 optical and radio rotation curves (RCs) and relative surface photometry to investigate the main mass structure properties of spirals, over a range of 6 mag and out to <~ 1.5 and 2 optical radii (for the optical and radio data, respectively). We confirm the strong dependence on luminosity for both the profile and the amplitude of RCs claimed by Persic & Salucci. Spiral RCs show the striking feature that a single global parameter, e.g. luminosity, dictates the rotational velocity at any radius for any object, so revealing the existence of a universal RC. At high luminosities, there is a slight discrepancy between the profiles of RCs and those predicted from the luminous matter (LM) distributions: this implies a small, yet detectable, amount of dark matter (DM). At low luminosities, the failure of the LM prediction is much more severe, and the DM is the only relevant mass component. We show that the universal RC implies a number of scaling properties between dark and luminous galactic structure parameters: (i) the DM/LM mass ratio scales inversely with luminosity; (ii) the central halo density scales as L^-0.7^; (iii) the halo core radius is comparable to the optical radius, but shrinks for low luminosities; (iv) the total halo mass scales as L^0.5^. Such scaling properties can be represented as a curve in the (luminosity)(DM/LM mass ratio)-(DM core radius)-(DM central density) space, which provides a geometrical description of the tight coupling between the dark and the luminous matter in spiral galaxies. Key words: galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure - dark matter. ======================================================================== 1996MNRAS.283.1102P Erratum: The universal rotation curve of spiral galaxies - I. The dark matter connection by Massimo Persic, Paolo Salucci and Fulvio Stel Key words: galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure - dark matter. The paper `The universal rotation curve of spiral galaxies - I. The dark matter connection' was published in Mon. Not. R. Astron. Soc. 281,27- 47(1996). Owing to a typesetting error, two of the equations in Section 6 (Conclusions) contain incorrect exponents. The correct equations are given below. See Journal.
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