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SIMPLE FIT OF DATA RELATING SUPERMASSIVE BLACK HOLE MASS TO GALAXY PITCH ANGLE

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Harry I. Ringermacher1 and Lawrence R. Mead2

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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.


Keywords

galaxies: fundamental parameters; galaxies: spiral; galaxies: structure


Dates

Issue 6 (2009 June)

Received 2008 November 12, accepted for publication 2009 March 24

Published 2009 April 23



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