Constraining the Stellar Mass Function in the Galactic Center via Mass Loss from Stellar Collisions

Abstract

The dense concentration of stars and high-velocity dispersions in the Galactic center imply that stellar collisions frequently occur. Stellar collisions could therefore result in significantmass loss rates. We calculate the amount of stellar mass lost due to indirect and direct stellar collisions and find its dependence on the present-day mass function of stars. We find that the total mass loss rate in the Galactic center due to stellar collisions is sensitive to the present-day mass function adopted. We use the observed diffuse X-ray luminosity in the Galactic center to preclude any present-day mass functions that result in mass loss rates > 10(-5)M circle dot yr(-1) in the vicinity of similar to 1". For present-day mass functions of the form, dN/dM alpha M-alpha we constrain the present-day mass function to have a minimum stellar mass <= 7M circle dot and a power-law slope >= 1.25. We also use this result to constrain the initial mass function in the Galactic center by considering different star formation scenarios.