Young Stellar Objects in the Gould Belt

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Dunham, Miranda M.
Allen, Lori E.
Evans, Neal J., II
Broekhoven-Fiene, Hannah
Cieza, Lucas A.
Di Francesco, James
Gutermuth, Robert A.
Harvey, Paul M.
Hatchell, Jennifer
Heiderman, Amanda

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We present the full catalog of Young Stellar Objects (YSOs) identified in the 18 molecular clouds surveyed by the Spitzer Space Telescope "cores to disks" (c2d) and "Gould Belt" (GB) Legacy surveys. Using standard techniques developed by the c2d project, we identify 3239 candidate YSOs in the 18 clouds, 2966 of which survive visual inspection and form our final catalog of YSOs in the GB. We compile extinction corrected spectral energy distributions for all 2966 YSOs and calculate and tabulate the infrared spectral index, bolometric luminosity, and bolometric temperature for each object. We find that 326 (11%), 210 (7%), 1248 (42%), and 1182 (40%) are classified as Class 0 + I, Flat-spectrum, Class II, and Class III, respectively, and show that the Class III sample suffers from an overall contamination rate by background Asymptotic Giant Branch stars between 25% and 90%. Adopting standard assumptions, we derive durations of 0.40-0.78 Myr for Class 0 + I YSOs and 0.26-0.50 Myr for Flat-spectrum YSOs, where the ranges encompass uncertainties in the adopted assumptions. Including inFormation from (sub) millimeter wavelengths, one-third of the Class 0 + I sample is classified as Class 0, leading to durations of 0.13-0.26 Myr (Class 0) and 0.27-0.52 Myr (Class I). We revisit infrared color-color diagrams used in the literature to classify YSOs and propose minor revisions to classification boundaries in these diagrams. Finally, we show that the bolometric temperature is a poor discriminator between Class II and Class III YSOs.



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Dunham, Michael M., Lori E. Allen, Neal J. Evans II, Hannah Broekhoven-Fiene, Lucas A. Cieza, James Di Francesco, Robert A. Gutermuth et al. "Young Stellar Objects in the Gould Belt." The Astrophysical Journal Supplement Series, Vol. 220, No. 1 (Sep., 2015): 11.