TY - CHAP AU - Madore, B. F. AU - Boissier, S. AU - Gil de Paz, Armando AU - Nelson, E. AU - Petrillo, K. PY - 2007 DO - http://arxiv.org/abs/0801.1340 SN - 978-1-58381-309-6 UR - https://hdl.handle.net/20.500.14352/53496 AB - We present recent results from several on-going studies: The first addresses the question of gas-density thresholds for star formation, as probed by the outer disks of normal nearby galaxies. The second concerns the observational evidence for the... LA - eng M2 - 455 PB - Astronomical Society of the Pacific KW - Disk TI - Spontaneous and stimulated star formation in galaxies: Ultraviolet limits on star formation thresholds and optical constraints on Lambda-CDM cosmological simulations of galaxy formation TY - book part ER -