The statistics of triggered star formation: an overdensity of YSOs around Spitzer infrared bubbles
James Urquhart, Larry Morgan
The concept of triggered star formation has been familiar to the star formation community for decades, although the precise nature of the triggering process, the detailed end results, and indeed the fraction of stars in the Milky Way that may have been triggered are all details that still elude us. Much recent effort has been focused on the catalogue of infrared bubbles discovered by Spitzer. Here, we present a detailed statistical study of the star formation around these bubbles. We demonstrate that there is an overdensity of star formation around the bubbles, determine the luminosity function of the triggered star formation and estimate a lower limit to the fraction of massive stars in the Milky Way that were triggered.