Physics and Astronomy
Mathematics and Natural Sciences
Seigar et al. have recently demonstrated a new, tight correlation between galactic central supermassive black hole (BH) mass and the pitch angle of the spiral arm in disk galaxies which they attribute to other indirect correlations. They fit a double power law, governed by five parameters, to the BH mass as a function of pitch. Noting the features of their fitted curve, we show that a simple linear proportion of the BH mass to the cotangent of the pitch angle can obtain the same fit, within error. Such a direct, elegant fit may help shed light on the nature of the correlation.
Ringermacher, H. I.,
Mead, L. R.
(2009). Simple Fit of Data Relating Supermassive Black Hole Mass to Galaxy Pitch Angle. Astronomical Journal, 137(6), 4716-4717.
Available at: https://aquila.usm.edu/fac_pubs/1158