Black Holes gobbling Asteroids and Comets

This story is at www.sciencedaily.com/releases/2012/02/120208133039.htm and apparently the giant black hole at the centre of our galaxy may be devouring asteroids and comets, or anything that comes within munching reach. This, it is argued, will explain the frequent flares observed by NASAs Chandra x-ray observatory. The paper, published in Monthly Notices of the Royal Astronomical Society, suggests that large numbers of asteroids are needed in order to produce the amount of flaring in the assumed black hole. Why else would the flaring take place?