Spitzer and Magellan Observations of NGC 2264: A Remarkable Star Forming   Core Near IRS-2
  We analyze {\it Spitzer} and Magellan observations of a star forming core near IRS-2 in the young cluster NGC 2264. The submillimeter source IRAS 12 S1, previously believed to be an intermediate mass Class 0 object is shown to be a dense collection of embedded, low mass stars. We argue that this group of stars represents the fragmenting collapse of a dense, turbulent core, based on a number of indicators of extreme youth. With reasonable estimates for the velocity dispersion in the group, we estimate a dynamical lifetime of only a few x 10$^{4}$ years. Spectral energy distributions of stars in the core are consistent with Class I or Class 0 assignments. We present observations of an extensive system of molecular hydrogen emission knots. The luminosity of the objects in the core region are consistent with roughly solar mass protostars. 
E.T. Young (1),P.S. Teixeira (2 and 3), C.J. Lada(2), J. Muzerolle(1),   S.E. Persson(4),D.C. Murphy (4), N. Siegler(1), M. ...