A Spitzer View of Star Formation in the Cyngus X North Complex
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
Pagination or Media Count:
We present new images and photometry of the massive star forming complex Cygnus X obtained with the Infrared Array Camera IRAC and the Multiband Imaging Photometer for Spitzer MIPS on board the Spitzer Space Telescope. A combination of IRAC, MIPS, UKIRT Deep Infrared Sky Survey UKIDSS, and Two Micron All Sky Survey 2MASS data are used to identify and classify young stellar objects. Of the 8,231 sources detected exhibiting infrared excess in Cygnus X North, 670 are classified as Class I and 7,249 are classified as Class II. Using spectra from the FAST spectrograph at the Fred L. Whipple Observatory and Hectospec on the MMT, we spectrally typed 536 sources in the Cygnus X complex to identify the massive stars. We find that YSOs tend to be grouped in the neighborhoods of massive B stars spectral types B0 to B9. We present a minimal spanning tree analysis of clusters in two regions in Cygnus X North. The fraction of infrared excess sources that belong to clusters with greater or equal to 10 members is found to be 50-70. Most Class II objects lie in dense clusters within blown out H II regions, while Class I sources tend to reside in more filamentary structures along the bright-rimmed clouds, indicating possible triggered star formation.
- Celestial Mechanics