A further fundamental modification needs to be made to the Freeman (1970) law, such that not only do LSB galaxies possess fainter central surface brightnesses than the canonical Freeman value, but the upper limit is in fact an upper (bright) 'envelope' of points in the central disk surface-brightness - log(scale-length) diagram, with slope ~2.
Disks of galaxies: kinematics, dynamics and perturbations: 4th Guillermo Haro Conference, Puebla, Mexico, 05-09 November 2001 / E. Athanassoula, Albert Bosma and Raul Mujica (eds.)
Conference name
Disks of galaxies: kinematics, dynamics and perturbations: 4th Guillermo Haro Conference, Puebla, Mexico, 05-09 November 2001 / E. Athanassoula, Albert Bosma and Raul Mujica eds.