Simple Fit of Data Relating Supermassive Black Hole Mass to Galaxy Pitch Angle

Abstract

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 disc 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.

arXiv comment2 pages, 1 fig

References in corpus (1)

• Discovery of a relationship between spiral arm morphology and supermassive black hole mass in disk galaxies

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