Spitzer Observations of L429: A Near-collapse or Collapsing Starless   Core
  We present Spitzer infrared observations of the starless core L429. The IR images of this core show an absorption feature, caused by the dense core material, at wavelengths <= 70 micron. The core has a steep density profile, and reaches A_V > 35 mag near the center. We show that L429 is either collapsing or in a near-collapse state. 
Amelia M. Stutz, Tyler L. Bourke, George H. Rieke, John H. Bieging,   Karl A. Misselt, Philip C. Myers, Yancy L. Shirley