The Star-formation efficiency as a function of Galactic Radius as seen by RMS
James Urquhart and the RMS team
By associating massive young stellar objects (MYSOs) in the Red MSX Survey (RMS) with molecular clouds identified in the Galactic Ring Survey (GRS), we have investigated variations in the star-formation efficiency (SFE) with Galactic radius. The results show that, in the section of the Galaxy defined by the GRS, the SFE peaks significantly at radii corresponding to the Sagittarius and Perseus spiral arms. In contrast to this, despite a large peak in the surface density of both RMS MYSOs and GRS clouds at the radius of the Scutum tangent, no significant peak in SFE is found in this region. The causes and implications of these results will be discussed.