A Massive Object in the Core of NGC 5055 ?

In a global kinematical study of NGC 5055 using high resolution Fabry-Perot interferometry, intriguing spectral line prooles have been observed in the center of the galaxy. These prooles seem to indicate a rapidly rotating disk with a radius near 365 pc and tilted 50 deg with respect to the major axis of the galaxy. In the hypothesis of a massive dark object, a naive keplerian estimate gives a mass between 10 7:2 to 10 7:5 M. Unfortunately the limited spectral domain of the Fabry-Perot leaves some ambiguity on the exact movement and velocity of this H emission. 2-D spectroscopy with a larger spectral range (eg.: TIGRE or low resolution Fabry-Perot) is thus required.